802 lines
18 KiB
C
802 lines
18 KiB
C
/*
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This file is part of libcapwap.
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libcapwap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libcapwap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "cw.h"
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#include "dbg.h"
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#include "log.h"
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#include "cw_util.h"
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#include "conn.h"
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#include "sock.h"
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#include "stravltree.h"
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#include "mod.h"
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#include "message_set.h"
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#include "cw_types.h"
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int conn_send_msg(struct conn *conn, uint8_t * rawmsg);
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/**
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* Init response message header
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*/
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void cw_init_response(struct conn *conn, uint8_t * req)
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{
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uint8_t *buffer;
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int shbytes, dhbytes;
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uint8_t *msgptr, *dmsgptr;
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buffer = conn->resp_buffer;
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shbytes = cw_get_hdr_msg_offset(req);
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memcpy(buffer, req, shbytes);
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cw_set_hdr_rmac(buffer, conn->base_rmac);
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/*
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// cw_set_hdr_hlen(buffer, 2);
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// cw_set_hdr_flags(buffer, CW_FLAG_HDR_M, 1);
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*/
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dhbytes = cw_get_hdr_msg_offset(buffer);
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msgptr = req + shbytes;
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dmsgptr = buffer + dhbytes;
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cw_set_msg_type(dmsgptr, cw_get_msg_type(msgptr) + 1);
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cw_set_msg_seqnum(dmsgptr, cw_get_msg_seqnum(msgptr));
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cw_set_msg_flags(dmsgptr, 0);
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}
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void cw_init_request(struct conn *conn, int msg_id)
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{
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uint8_t *buffer = conn->req_buffer;
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uint8_t *msgptr;
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/* zero the first 8 bytes */
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cw_put_dword(buffer + 0, 0);
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cw_put_dword(buffer + 4, 0);
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/* unencrypted */
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cw_set_hdr_preamble(buffer, CAPWAP_VERSION << 4 | 0);
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cw_set_hdr_rmac(buffer, conn->base_rmac);
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/*
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//cw_set_hdr_hlen(buffer, 2);
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*/
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cw_set_hdr_wbid(buffer, conn->wbid);
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cw_set_hdr_rid(buffer, 0);
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msgptr = cw_get_hdr_msg_offset(buffer) + buffer;
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cw_set_msg_type(msgptr, msg_id);
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cw_set_msg_flags(msgptr, 0);
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cw_set_msg_elems_len(msgptr, 0);
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}
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void cw_init_data_msg(struct conn *conn)
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{
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uint8_t *buffer = conn->req_buffer;
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cw_put_dword(buffer + 0, 0);
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cw_put_dword(buffer + 4, 0);
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/* unencrypted */
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cw_set_hdr_preamble(buffer, CAPWAP_VERSION << 4 | 0);
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}
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/**
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* send a response
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*/
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int cw_send_response(struct conn *conn, uint8_t * rawmsg, int len)
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{
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cw_init_response(conn, rawmsg);
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if (cw_put_msg(conn, conn->resp_buffer) == -1)
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return 0;
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conn_send_msg(conn, conn->resp_buffer);
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return 1;
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}
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/**
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* Special case error message, which is sent when an unexpected messages
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* was received or something else happened.
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* @param conn conection
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* @param rawmsg the received request message, which the response belongs to
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* @param result_code result code to send
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* @return 1
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*/
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int cw_send_error_response(struct conn *conn, uint8_t * rawmsg, uint32_t result_code)
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{
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uint8_t *out,*dst;
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int l;
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cw_init_response(conn, rawmsg);
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out = conn->resp_buffer;
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dst = cw_get_hdr_msg_elems_ptr(out);
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l = cw_put_elem_result_code(dst, result_code);
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cw_set_msg_elems_len(out + cw_get_hdr_msg_offset(out), l);
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conn_send_msg(conn, conn->resp_buffer);
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return 1;
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}
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static int check_len(struct conn *conn, struct cw_action_in *a, uint8_t * data, int len,
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struct sockaddr *from)
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{
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if (!a->max_len)
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return 1;
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/* if (len < a->min_len) {
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cw_dbg(DBG_ELEM_ERR,
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"%d (%s) message element too short, len=%d, min len=%d",
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a->elem_id, cw_strelemp(conn->actions, a->elem_id), len,
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a->min_len);
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return 0;
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}
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if (len > a->max_len) {
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cw_dbg(DBG_ELEM_ERR,
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"%d (%s) message element too big, len=%d, max len=%d", a->elem_id,
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cw_strelemp(conn->actions, a->elem_id), len, a->max_len);
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return 0;
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}
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*/
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return 1;
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}
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static struct cw_MsgSet *load_msg_set(struct conn *conn, uint8_t * rawmsg, int len,
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int elems_len, struct sockaddr *from)
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{
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char sock_buf[SOCK_ADDR_BUFSIZE];
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struct cw_Mod *cmod, *bmod;
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cmod =
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cw_mod_detect(conn, rawmsg, len, elems_len, from, CW_MOD_MODE_CAPWAP);
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if (cmod == MOD_NULL) {
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cw_dbg(DBG_MSG_ERR,
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"Can't find mod to handle connection from %s, discarding message",
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sock_addr2str_p(from,sock_buf));
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return NULL;
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}
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bmod =
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cw_mod_detect(conn, rawmsg, len, elems_len, from, MOD_MODE_BINDINGS);
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cw_dbg(DBG_INFO, "Mods deteced: %s,%s", cmod->name, bmod->name);
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/*
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// struct cw_actiondef *ad = mod_cache_add(conn,cmod, bmod);
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*/
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return cw_mod_get_msg_set(conn,cmod,bmod);
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}
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int cw_in_check_generic(struct conn *conn, struct cw_action_in *a, uint8_t * data,
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int len,struct sockaddr *from)
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{
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if (cw_is_request(a->msg_id)){
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return cw_in_check_generic_req(conn,a,data,len,from);
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}
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return cw_in_check_generic_resp(conn,a,data,len,from);
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}
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void cw_read_elem(struct cw_ElemHandler * handler, struct conn * conn,
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uint8_t * elem_data, int elem_len, struct sockaddr * from){
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mavldata_t data, *result;
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char str[30];
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result = handler->type->get(&data,elem_data,elem_len);
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handler->type->to_str(result,str,30);
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printf("Read %d-%s: %s %s\n", handler->id, handler->name, handler->key, str);
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/*mavl_add(conn->remote_cfg*/
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}
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static int process_elements(struct conn *conn, uint8_t * rawmsg, int len,
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struct sockaddr *from)
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{
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char sock_buf[SOCK_ADDR_BUFSIZE]; /**< to hold str from sockaddr2str */
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struct cw_action_in as, *af, *afm;
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int offset = cw_get_hdr_msg_offset(rawmsg);
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uint8_t *msg_ptr = rawmsg + offset;
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int elems_len = cw_get_msg_elems_len(msg_ptr);
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int payloadlen = len - offset;
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/* pre-check message */
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if (payloadlen - 8 != elems_len) {
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if (conn->strict_hdr) {
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cw_dbg(DBG_MSG_ERR,
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"Discarding message from %s, msgelems len=%d, payload len=%d, (Strict CAPWAP) ",
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sock_addr2str(&conn->addr,sock_buf), elems_len, payloadlen - 8);
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errno = EAGAIN;
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return -1;
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}
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if (elems_len < payloadlen - 8) {
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cw_dbg(DBG_RFC,
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"Packet from from %s has %d bytes of extra data, ignoring.",
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sock_addr2str(&conn->addr,sock_buf), payloadlen - 8 - elems_len);
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elems_len = len - 8;
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}
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if (elems_len > payloadlen - 8) {
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cw_dbg(DBG_RFC,
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"Packet from from %s has msgelems len of %d bytes, but has only %d bytes of data, truncating.",
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sock_addr2str(&conn->addr, sock_buf), elems_len, payloadlen - 8);
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elems_len = payloadlen - 8;
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}
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}
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/* Detect the connecting AC type */
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if (!conn->detected) {
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struct cw_MsgSet *set = load_msg_set(conn, rawmsg, len, elems_len, from);
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if (!set) {
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/*
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//cw_log(LOG_ERR, "Error");
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*/
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errno = EAGAIN;
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return -1;
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}
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conn->msgset= set;
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conn->detected = 1;
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}
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/** debug the received message */
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cw_dbg_msg(DBG_MSG_IN, conn, rawmsg, len, from);
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/* prepare struct for search operation */
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struct cw_MsgData search;
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search.type = cw_get_msg_id(msg_ptr);
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/* Search message */
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struct cw_MsgData * message;
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message = mavl_find_ptr(conn->msgset->messages,&search);
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int result_code = 0;
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if (!message){
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/* Message is unknown */
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cw_dbg(DBG_MSG_ERR, "Message type %d (%s) unknown.",
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search.type, cw_strmsg(search.type),
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cw_strstate(conn->capwap_state));
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result_code = CW_RESULT_MSG_UNRECOGNIZED;
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cw_send_error_response(conn, rawmsg, result_code);
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errno = EAGAIN;
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return -1;
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}
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/* Throw away unexpected messages */
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/* maybe we have to check this too: if (!(message->type & 1))
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* means unexpected response message
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* */
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if (!(message->receiver & conn->receiver)) {
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cw_dbg(DBG_MSG_ERR,
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"Message type %d (%s) unexpected/illegal in %s State, discarding.",
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search.type, cw_strmsg(search.type),
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cw_strstate(conn->capwap_state));
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errno = EAGAIN;
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return -1;
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}
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/* Check if current state is in state of message */
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int *i = message->states;
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for (i=message->states; *i; i++){
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if(*i==conn->capwap_state)
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break;
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}
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if (!*i){
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/* Message found, but it was in wrong state */
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cw_dbg(DBG_MSG_ERR,
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"Message type %d (%s) not allowed in %s State.", search.type,
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cw_strmsg(search.type), cw_strstate(conn->capwap_state));
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result_code = CAPWAP_RESULT_MSG_INVALID_IN_CURRENT_STATE;
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cw_send_error_response(conn, rawmsg, result_code);
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errno = EAGAIN;
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return -1;
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}
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if (conn->msg_start){
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conn->msg_start(conn, afm, rawmsg, len, from);
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}
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/* Execute start processor for message */
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/*
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// if (afm->start) {
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// afm->start(conn, afm, rawmsg, len, from);
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// }
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*/
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uint8_t *elems_ptr = cw_get_msg_elems_ptr(msg_ptr);
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uint8_t *elem;
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/* Create an avltree to catch the found mandatory elements */
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conn->mand = stravltree_create();
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int unrecognized = 0;
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/* iterate through message elements */
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cw_foreach_elem(elem, elems_ptr, elems_len) {
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struct cw_ElemHandler *handler;
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struct cw_ElemData * elem_data, elem_data_search;
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int elem_len, elem_id;
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elem_id = cw_get_elem_id(elem);
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handler = cw_msgset_get_elemhandler(conn->msgset,0, 0, elem_id);
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if (!handler) {
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cw_dbg(DBG_ELEM_ERR, "Unknown message element: %d, ignoring",
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elem_id);
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continue;
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}
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elem_data_search.id=elem_id;
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elem_data_search.proto=0;
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elem_data_search.vendor=0;
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elem_data = mavl_find_ptr(message->elements_tree,&elem_data_search);
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if (!elem_data){
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cw_dbg(DBG_ELEM_ERR, "Element %d - %s, not allowed here",
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elem_id, handler->name);
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continue;
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}
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elem_len = cw_get_elem_len(elem);
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printf ("Would start elem processing now %d - %s\n",handler->id, handler->name);
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handler->get(conn, handler, cw_get_elem_data(elem), elem_len, from);
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continue;
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exit(0);
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as.elem_id = cw_get_elem_id(elem);
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/* int elem_len = cw_get_elem_len(elem);*/
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/*
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//cw_elem_handler_t search_eh;
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//memset(&search_eh,0,sizeof(search_eh));
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// struct cw_ElemDef search_elem;
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// search_elem.handler=&search_eh;
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// search_eh.id = cw_get_elem_id(elem);
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*/
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struct cw_ElemDef * elem;
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/*
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// TODO XXX
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// af = cw_actionlist_in_get(conn->actions->in, &as);
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*/
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af = 0;
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if (!af) {
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unrecognized++;
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/* cw_dbg(DBG_ELEM_ERR,
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"Element %d (%s) not allowed in msg of type %d (%s), ignoring.",
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// TODO XXXX as.elem_id, cw_strelemp(conn->actions, as.elem_id),
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as.msg_id, cw_strmsg(as.msg_id));
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*/
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continue;
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}
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if (!check_len(conn, af, cw_get_elem_data(elem), elem_len, from)) {
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continue;
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}
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cw_dbg_elem(DBG_ELEM, conn, as.msg_id, as.elem_id, cw_get_elem_data(elem),
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elem_len);
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int afrc = 1;
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if (af->start) {
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afrc =
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af->start(conn, af, cw_get_elem_data(elem), elem_len, from);
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}
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if (af->mand && afrc) {
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/* add found mandatory message element
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to mand list */
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stravltree_add(conn->mand, af->item_id);
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}
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if(conn->elem_end){
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/*
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// TODO XXXX
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// afrc = conn->elem_end(conn,af,afrc,cw_get_elem_data(elem), elem_len,from);
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*/
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}
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}
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/* all message elements are processed, do now after processing
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by calling the "end" function for the message */
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{
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mavliter_t it;
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const struct cw_Type * type;
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printf("********** THE REMODE CFG **************\n");
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mavliter_init(&it,conn->remote_cfg);
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mavliter_foreach(&it){
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char value[500];
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mavldata_t * data;
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data = mavliter_get(&it);
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type = data->kv.priv;
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type->to_str(data,value,0);
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printf("Got %s (%s): %s\n",data->kv.key,type->name, value);
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}
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}
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//int result_code = 0;
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int rct = cw_in_check_generic(conn, afm, rawmsg, len, from);
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if (rct && conn->strict_capwap)
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{
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result_code = rct;
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}
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else {
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if (afm->end) {
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result_code = afm->end(conn, afm, rawmsg, len, from);
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}
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if (conn->msg_end){
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conn->msg_end(conn, afm, rawmsg, len, from);
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}
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}
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if (unrecognized) {
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cw_dbg(DBG_RFC, "Message has %d unrecognized message elements.",
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unrecognized);
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/* set only resultcode for request messages */
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if ( (!result_code) && ((afm->msg_id & 1))) {
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if (conn->strict_capwap) {
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result_code = CW_RESULT_UNRECOGNIZED_MESSAGE_ELEMENT;
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}
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}
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}
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/* if we've got a request message, we always have to send a response message */
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if (as.msg_id & 1) {
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if (result_code > 0) {
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/* the end method gave us an result code>0, so
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send an error message */
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cw_send_error_response(conn, rawmsg, result_code);
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} else if (result_code == 0) {
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/* All ok, send regular response message */
|
|
cw_send_response(conn, rawmsg, len);
|
|
} else {
|
|
/* the request message is ignored, no response
|
|
will be sent */
|
|
errno = EAGAIN;
|
|
}
|
|
} else {
|
|
/*
|
|
* Whe have got a response message.
|
|
* Put further actions here, if needed.
|
|
*/
|
|
}
|
|
|
|
stravltree_destroy(conn->mand);
|
|
|
|
return result_code;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
int process_message(struct conn *conn, uint8_t * rawmsg, int rawlen,
|
|
struct sockaddr *from)
|
|
{
|
|
char sock_buf[SOCK_ADDR_BUFSIZE];
|
|
|
|
uint8_t *msgptr = rawmsg + cw_get_hdr_msg_offset(rawmsg);
|
|
|
|
|
|
uint32_t type = cw_get_msg_type(msgptr);
|
|
|
|
if (!(type & 0x1)) {
|
|
/* It's a response message, no further examination required. */
|
|
return process_elements(conn, rawmsg, rawlen, from);
|
|
}
|
|
|
|
/* It's a request message, check if seqnum is right and if
|
|
* we have already sent a response message*/
|
|
|
|
uint8_t seqnum = cw_get_msg_seqnum(msgptr);
|
|
|
|
int s1 = conn->last_seqnum_received;
|
|
int s2 = seqnum;
|
|
int sd = s2 - s1;
|
|
|
|
if ((sd > 0 && sd < 128) || (sd < 0 && sd < -128) || s1 < 0) {
|
|
/* seqnum is ok, normal message processing */
|
|
conn->last_seqnum_received = seqnum;
|
|
return process_elements(conn, rawmsg, rawlen, from);
|
|
}
|
|
|
|
if (sd != 0) {
|
|
cw_dbg(DBG_MSG_ERR,
|
|
"Discarding message from %s, old seqnum, seqnum = %d, last seqnum=%d",
|
|
sock_addr2str(&conn->addr,sock_buf), s2, s1);
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
/* the received request message was retransmittet by our peer,
|
|
* let's retransmit our response message if we have one*/
|
|
|
|
|
|
cw_dbg(DBG_MSG_ERR,
|
|
"Retransmitted request message from %s detected, seqnum=%d, type=%d",
|
|
sock_addr2str(&conn->addr,sock_buf), s2, type);
|
|
|
|
|
|
if (cw_get_hdr_msg_type(conn->resp_buffer) - 1 != type) {
|
|
cw_dbg(DBG_MSG_ERR,
|
|
"No cached response for retransmission, request seqnum=%d,in cache=%d",
|
|
s2, conn->resp_msg.type);
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
cw_dbg(DBG_MSG_ERR, "Retransmitting response message to %s, seqnum=%d",
|
|
sock_addr2str(&conn->addr, sock_buf), s2);
|
|
|
|
// XXX untested
|
|
conn_send_msg(conn, conn->resp_buffer);
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process an incomming CAPWAP packet, assuming the packet is already decrypted
|
|
* @param conn conection object
|
|
* @param packet pointer to packet data
|
|
* @param len lenght of packet data
|
|
*/
|
|
int conn_process_packet2(struct conn *conn, uint8_t * packet, int len,
|
|
struct sockaddr *from)
|
|
{
|
|
char sock_buf[SOCK_ADDR_BUFSIZE];
|
|
|
|
if (len < 8) {
|
|
/* packet too short */
|
|
cw_dbg(DBG_PKT_ERR,
|
|
"Discarding packet from %s, packet too short, len=%d, at least 8 expected.",
|
|
sock_addr2str(&conn->addr, sock_buf), len);
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
int preamble = cw_get_hdr_preamble(packet);
|
|
|
|
if ((preamble & 0xf0) != (CAPWAP_VERSION << 4)) {
|
|
/* wrong version */
|
|
cw_dbg(DBG_PKT_ERR,
|
|
"Discarding packet from %s, wrong version, version=%d, version %d expected.",
|
|
sock_addr2str(&conn->addr,sock_buf), (preamble & 0xf0) >> 4,
|
|
CAPWAP_VERSION);
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
if (preamble & 0xf) {
|
|
/* Encrypted data, this shuold never happen here */
|
|
cw_dbg(DBG_PKT_ERR,
|
|
"Discarding packet from %s, encrypted data after decryption ...",
|
|
sock_addr2str(&conn->addr,sock_buf));
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
|
|
int offs = cw_get_hdr_msg_offset(packet);
|
|
|
|
|
|
int payloadlen = len - offs;
|
|
if (payloadlen < 0) {
|
|
/* Eleminate messages with wrong header size */
|
|
cw_dbg(DBG_PKT_ERR,
|
|
"Discarding packet from %s, header length (%d) greater than packet len (%d).",
|
|
sock_addr2str(&conn->addr,sock_buf), offs, len);
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
/* Check if Radio MAC is present */
|
|
if (cw_get_hdr_flag_m(packet)) {
|
|
|
|
if (cw_get_hdr_rmac_len(packet) + 8 > offs) {
|
|
/* wrong rmac size */
|
|
cw_dbg(DBG_PKT_ERR,
|
|
"Discarding packet from %s, wrong R-MAC size, size=%d",
|
|
sock_addr2str(&conn->addr,sock_buf), *(packet + 8));
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
if (cw_get_hdr_flag_f(packet)) {
|
|
/* fragmented, add the packet to fragman */
|
|
uint8_t *f;
|
|
f = fragman_add(conn->fragman, packet, offs, payloadlen);
|
|
if (f == NULL) {
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
|
|
cw_dbg_pkt(DBG_PKT_IN, conn, f + 4, *(uint32_t *) f, from);
|
|
// cw_dbg_msg(DBG_MSG_IN, conn, f + 4, *(uint32_t *) f, from);
|
|
|
|
// XXX: Modify fragman to not throw away CAPWAP headers
|
|
|
|
int rc = conn->process_message(conn, f + 4, *(uint32_t *) f, from);
|
|
|
|
free(f);
|
|
return rc;
|
|
}
|
|
|
|
/* not fragmented, we have a complete message */
|
|
// cw_dbg_msg(DBG_MSG_IN, conn, packet, len, from);
|
|
return conn->process_message(conn, packet, len, from);
|
|
}
|
|
|
|
int conn_process_packet(struct conn *conn, uint8_t * packet, int len,
|
|
struct sockaddr *from){
|
|
|
|
/* show this packet in debug output */
|
|
cw_dbg_pkt(DBG_PKT_IN, conn, packet, len, from);
|
|
|
|
return conn_process_packet2(conn,packet,len,from);
|
|
}
|
|
|
|
|
|
int conn_process_data_packet(struct conn *conn, uint8_t * packet, int len,
|
|
struct sockaddr *from){
|
|
|
|
/* show this packet in debug output */
|
|
cw_dbg_pkt(DBG_PKT_IN, conn, packet, len, from);
|
|
|
|
return conn_process_packet2(conn,packet,len,from);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
* Used as main message loop
|
|
*/
|
|
int cw_read_messages(struct conn *conn)
|
|
{
|
|
uint8_t buf[2024];
|
|
int len = 2024;
|
|
|
|
int n = conn->read(conn, buf, len);
|
|
if (n < 0)
|
|
return n;
|
|
|
|
if (n > 0) {
|
|
return conn->process_packet(conn, buf, n,
|
|
(struct sockaddr *) &conn->addr);
|
|
}
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
|
|
int cw_read_from(struct conn *conn)
|
|
{
|
|
if (!conn->readfrom) {
|
|
cw_log(LOG_ERR, "Fatal error, no readfrom method available.");
|
|
errno = EPROTO;
|
|
return -1;
|
|
}
|
|
uint8_t buf[2024];
|
|
int len = 2024;
|
|
|
|
struct sockaddr_storage from;
|
|
int n = conn->readfrom(conn, buf, len, &from);
|
|
if (n < 0)
|
|
return n;
|
|
|
|
if (n > 0) {
|
|
return conn->process_packet(conn, buf, n, (struct sockaddr *) &from);
|
|
}
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|