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Diffstat (limited to 'lib/libalias/alias_skinny.c')
| -rw-r--r-- | lib/libalias/alias_skinny.c | 350 |
1 files changed, 0 insertions, 350 deletions
diff --git a/lib/libalias/alias_skinny.c b/lib/libalias/alias_skinny.c deleted file mode 100644 index d1e4a14..0000000 --- a/lib/libalias/alias_skinny.c +++ /dev/null @@ -1,350 +0,0 @@ -/*- - * alias_skinny.c - * - * Copyright (c) 2002, 2003 MarcusCom, Inc. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * Author: Joe Marcus Clarke <marcus@FreeBSD.org> - * - * $FreeBSD$ - */ - -#include <stdio.h> -#include <string.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netinet/in_systm.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include <netinet/ip.h> -#include <netinet/tcp.h> -#include <netinet/udp.h> -#include <unistd.h> - -#include "alias_local.h" - -/* - * alias_skinny.c handles the translation for the Cisco Skinny Station - * protocol. Skinny typically uses TCP port 2000 to set up calls between - * a Cisco Call Manager and a Cisco IP phone. When a phone comes on line, - * it first needs to register with the Call Manager. To do this it sends - * a registration message. This message contains the IP address of the - * IP phone. This message must then be translated to reflect our global - * IP address. Along with the registration message (and usually in the - * same packet), the phone sends an IP port message. This message indicates - * the TCP port over which it will communicate. - * - * When a call is placed from the phone, the Call Manager will send an - * Open Receive Channel message to the phone to let the caller know someone - * has answered. The phone then sends back an Open Receive Channel - * Acknowledgement. In this packet, the phone sends its IP address again, - * and the UDP port over which the voice traffic should flow. These values - * need translation. Right after the Open Receive Channel Acknowledgement, - * the Call Manager sends a Start Media Transmission message indicating the - * call is connected. This message contains the IP address and UDP port - * number of the remote (called) party. Once this message is translated, the - * call can commence. The called part sends the first UDP packet to the - * calling phone at the pre-arranged UDP port in the Open Receive Channel - * Acknowledgement. - * - * Skinny is a Cisco-proprietary protocol and is a trademark of Cisco Systems, - * Inc. All rights reserved. -*/ - -/* #define DEBUG 1 */ - -/* Message types that need translating */ -#define REG_MSG 0x00000001 -#define IP_PORT_MSG 0x00000002 -#define OPNRCVCH_ACK 0x00000022 -#define START_MEDIATX 0x0000008a - -struct skinny_header { - u_int32_t len; - u_int32_t reserved; - u_int32_t msgId; -}; - -struct RegisterMessage { - u_int32_t msgId; - char devName [16]; - u_int32_t uid; - u_int32_t instance; - u_int32_t ipAddr; - u_char devType; - u_int32_t maxStreams; -}; - -struct IpPortMessage { - u_int32_t msgId; - u_int32_t stationIpPort; /* Note: Skinny uses 32-bit port - * numbers */ -}; - -struct OpenReceiveChannelAck { - u_int32_t msgId; - u_int32_t status; - u_int32_t ipAddr; - u_int32_t port; - u_int32_t passThruPartyID; -}; - -struct StartMediaTransmission { - u_int32_t msgId; - u_int32_t conferenceID; - u_int32_t passThruPartyID; - u_int32_t remoteIpAddr; - u_int32_t remotePort; - u_int32_t MSPacket; - u_int32_t payloadCap; - u_int32_t precedence; - u_int32_t silenceSuppression; - u_short maxFramesPerPacket; - u_int32_t G723BitRate; -}; - -typedef enum { - ClientToServer = 0, - ServerToClient = 1 -} ConvDirection; - - -static int -alias_skinny_reg_msg(struct RegisterMessage *reg_msg, struct ip *pip, - struct tcphdr *tc, struct alias_link *lnk, - ConvDirection direction) -{ - (void)direction; - - reg_msg->ipAddr = (u_int32_t) GetAliasAddress(lnk).s_addr; - - tc->th_sum = 0; - tc->th_sum = TcpChecksum(pip); - - return (0); -} - -static int -alias_skinny_startmedia(struct StartMediaTransmission *start_media, - struct ip *pip, struct tcphdr *tc, - struct alias_link *lnk, u_int32_t localIpAddr, - ConvDirection direction) -{ - struct in_addr dst, src; - - (void)pip; - (void)tc; - (void)lnk; - (void)direction; - - dst.s_addr = start_media->remoteIpAddr; - src.s_addr = localIpAddr; - - /* - * XXX I should probably handle in bound global translations as - * well. - */ - - return (0); -} - -static int -alias_skinny_port_msg(struct IpPortMessage *port_msg, struct ip *pip, - struct tcphdr *tc, struct alias_link *lnk, - ConvDirection direction) -{ - (void)direction; - - port_msg->stationIpPort = (u_int32_t) ntohs(GetAliasPort(lnk)); - - tc->th_sum = 0; - tc->th_sum = TcpChecksum(pip); - - return (0); -} - -static int -alias_skinny_opnrcvch_ack(struct libalias *la, struct OpenReceiveChannelAck *opnrcvch_ack, - struct ip *pip, struct tcphdr *tc, - struct alias_link *lnk, u_int32_t * localIpAddr, - ConvDirection direction) -{ - struct in_addr null_addr; - struct alias_link *opnrcv_lnk; - u_int32_t localPort; - - (void)lnk; - (void)direction; - - *localIpAddr = (u_int32_t) opnrcvch_ack->ipAddr; - localPort = opnrcvch_ack->port; - - null_addr.s_addr = INADDR_ANY; - opnrcv_lnk = FindUdpTcpOut(la, pip->ip_src, null_addr, - htons((u_short) opnrcvch_ack->port), 0, - IPPROTO_UDP, 1); - opnrcvch_ack->ipAddr = (u_int32_t) GetAliasAddress(opnrcv_lnk).s_addr; - opnrcvch_ack->port = (u_int32_t) ntohs(GetAliasPort(opnrcv_lnk)); - - tc->th_sum = 0; - tc->th_sum = TcpChecksum(pip); - - return (0); -} - -void -AliasHandleSkinny(struct libalias *la, struct ip *pip, struct alias_link *lnk) -{ - size_t hlen, tlen, dlen; - struct tcphdr *tc; - u_int32_t msgId, t, len, lip; - struct skinny_header *sd; - size_t orig_len, skinny_hdr_len = sizeof(struct skinny_header); - ConvDirection direction; - - tc = (struct tcphdr *)ip_next(pip); - hlen = (pip->ip_hl + tc->th_off) << 2; - tlen = ntohs(pip->ip_len); - dlen = tlen - hlen; - - sd = (struct skinny_header *)tcp_next(tc); - - /* - * XXX This direction is reserved for future use. I still need to - * handle the scenario where the call manager is on the inside, and - * the calling phone is on the global outside. - */ - if (ntohs(tc->th_dport) == la->skinnyPort) { - direction = ClientToServer; - } else if (ntohs(tc->th_sport) == la->skinnyPort) { - direction = ServerToClient; - } else { -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Invalid port number, not a Skinny packet\n"); -#endif - return; - } - - orig_len = dlen; - /* - * Skinny packets can contain many messages. We need to loop - * through the packet using len to determine message boundaries. - * This comes into play big time with port messages being in the - * same packet as register messages. Also, open receive channel - * acks are usually buried in a pakcet some 400 bytes long. - */ - while (dlen >= skinny_hdr_len) { - len = (sd->len); - msgId = (sd->msgId); - t = len; - - if (t > orig_len || t > dlen) { -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Not a skinny packet, invalid length \n"); -#endif - return; - } - switch (msgId) { - case REG_MSG: { - struct RegisterMessage *reg_mesg; - - if (len < (int)sizeof(struct RegisterMessage)) { -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Not a skinny packet, bad registration message\n"); -#endif - return; - } - reg_mesg = (struct RegisterMessage *)&sd->msgId; -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Received a register message"); -#endif - alias_skinny_reg_msg(reg_mesg, pip, tc, lnk, direction); - break; - } - case IP_PORT_MSG: { - struct IpPortMessage *port_mesg; - - if (len < (int)sizeof(struct IpPortMessage)) { -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Not a skinny packet, port message\n"); -#endif - return; - } -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Received ipport message\n"); -#endif - port_mesg = (struct IpPortMessage *)&sd->msgId; - alias_skinny_port_msg(port_mesg, pip, tc, lnk, direction); - break; - } - case OPNRCVCH_ACK: { - struct OpenReceiveChannelAck *opnrcvchn_ack; - - if (len < (int)sizeof(struct OpenReceiveChannelAck)) { -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Not a skinny packet, packet,OpnRcvChnAckMsg\n"); -#endif - return; - } -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Received open rcv channel msg\n"); -#endif - opnrcvchn_ack = (struct OpenReceiveChannelAck *)&sd->msgId; - alias_skinny_opnrcvch_ack(la, opnrcvchn_ack, pip, tc, lnk, &lip, direction); - break; - } - case START_MEDIATX: { - struct StartMediaTransmission *startmedia_tx; - - if (len < (int)sizeof(struct StartMediaTransmission)) { -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Not a skinny packet,StartMediaTx Message\n"); -#endif - return; - } -#ifdef DEBUG - fprintf(stderr, - "PacketAlias/Skinny: Received start media trans msg\n"); -#endif - startmedia_tx = (struct StartMediaTransmission *)&sd->msgId; - alias_skinny_startmedia(startmedia_tx, pip, tc, lnk, lip, direction); - break; - } - default: - break; - } - /* Place the pointer at the next message in the packet. */ - dlen -= len + (skinny_hdr_len - sizeof(msgId)); - sd = (struct skinny_header *)(((char *)&sd->msgId) + len); - } -} |
