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linether.c
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#if 0
/*
Copyright 2001-2015 John Wiseman G8BPQ
This file is part of LinBPQ/BPQ32.
LinBPQ/BPQ32 is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LinBPQ/BPQ32 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LinBPQ/BPQ32. If not, see http://www.gnu.org/licenses
*/
//
// DLL to provide BPQEther support for G8BPQ switch in a Linux environment,
// Normally uses a Raw socket, but that can't send to other apps on same machine.
// so can use a TAP device instead (or maybe as well??)
#include <stdio.h>
#include "CHeaders.h"
#include <sys/socket.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
extern char * PortConfig[33];
extern int tap_fd;
typedef struct PCAPStruct
{
UCHAR EthSource[6];
UCHAR EthDest[6];
short EtherType;
BOOL RLITX;
BOOL RLIRX;
BOOL Promiscuous;
int s; /*socketdescriptor*/
struct sockaddr_ll socket_address; /*target address*/
} PCAPINFO, *PPCAPINFO ;
PCAPINFO PCAPInfo[32];
// on linux default to broadcast
short udpport=0;
unsigned int OurInst = 0;
BOOL GotMsg;
DWORD n;
char Adapter[256];
static BOOL ReadConfigFile(int Port);
static int ProcessLine(char * buf,int Port, BOOL CheckPort);
int ExtProc(int fn, int port,unsigned char * buff, int code)
{
int len,txlen=0,res;
char txbuff[500];
unsigned char rxbuff[1600];
PCAPINFO * IF = &PCAPInfo[port];
if (IF->s == 0)
return 0;
switch (fn)
{
case 1: // poll
res = recvfrom(IF->s, rxbuff, ETH_FRAME_LEN, 0, NULL, NULL);
if (res == -1)
{
if (errno == 11)
return 0; //Resource temporarily unavailable
perror("Eth RX");
return 0;
}
if (res == 0)
/* Timeout elapsed */
return 0;
if (rxbuff[13] != 0xff)
return 0;
if (IF->RLIRX)
// RLI MODE - An extra 3 bytes before len, seem to be 00 00 41
{
len=rxbuff[18]*256 + rxbuff[17];
if ((len < 16) || (len > 320)) return 0; // Probably BPQ Mode Frame
len-=3;
memcpy(&buff[7],&rxbuff[19],len);
len+=5;
}
else
{
len=rxbuff[15]*256 + rxbuff[14];
if ((len < 16) || (len > 320)) return 0; // Probably RLI Mode Frame
len-=3;
memcpy(&buff[7],&rxbuff[16],len);
len+=5;
}
buff[5]=(len & 0xff);
buff[6]=(len >> 8);
return 1;
case 2: // send
if (IF->RLITX)
// RLI MODE - An extra 3 bytes before len, seem to be 00 00 41
{
txlen=(buff[6]<<8) + buff[5]; // BPQEther is DOS-based - chain word is 2 bytes
txlen-=2;
txbuff[16]=0x41;
txbuff[17]=(txlen & 0xff);
txbuff[18]=(txlen >> 8);
if (txlen < 1 || txlen > 400)
return 0;
memcpy(&txbuff[19],&buff[7],txlen);
}
else
{
txlen=(buff[6]<<8) + buff[5]; // BPQEther is DOS-based - chain word is 2 bytes
txlen-=2;
txbuff[14]=(txlen & 0xff);
txbuff[15]=(txlen >> 8);
if (txlen < 1 || txlen > 400)
return 0;
memcpy(&txbuff[16],&buff[7],txlen);
}
memcpy(&txbuff[0], &IF->EthDest[0],6);
memcpy(&txbuff[6], &IF->EthSource[0],6);
memcpy(&txbuff[12], &IF->EtherType,2);
txlen+=14;
if (txlen < 60) txlen = 60;
// Send down the packet
res = sendto(IF->s, txbuff, txlen, 0,
(const struct sockaddr *)&IF->socket_address, sizeof(struct sockaddr_ll));
if (res < 0)
{
perror("Eth Send");
return 3;
}
// if (tap_fd)
// write(tap_fd, txbuff, txlen);
return (0);
case 3: // CHECK IF OK TO SEND
return (0); // OK
case 4: // reinit
return 0;
case 5: // reinit
return 0;
}
return (0);
}
UINT ETHERExtInit(struct PORTCONTROL * PortEntry)
{
// Can have multiple ports, each mapping to a different Ethernet Adapter
// The Adapter number is in IOADDR
//
int i=0;
u_int netmask;
char buf[256];
int n;
struct ifreq ifr;
size_t if_name_len;
PCAPINFO * IF;
int port = PortEntry->PORTNUMBER;
u_long param=1;
struct ifreq buffer;
WritetoConsole("BPQEther ");
//
// Read config
//
if (!ReadConfigFile(port))
return (FALSE);
if_name_len = strlen(Adapter);
IF = &PCAPInfo[port];
IF->s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_BPQ));
if (IF->s == -1)
{
perror("Open Ether Socket");
IF->s = 0;
}
else
{
ioctl(IF->s, FIONBIO, ¶m);
memcpy(ifr.ifr_name, Adapter, if_name_len);
ifr.ifr_name[if_name_len] = 0;
if (ioctl(IF->s, SIOCGIFINDEX,&ifr) == -1)
perror("Get IF Number");
// Get MAC Address
memset(&buffer, 0x00, sizeof(buffer));
strcpy(buffer.ifr_name, Adapter);
ioctl(IF->s, SIOCGIFHWADDR, &buffer);
memcpy(IF->EthSource, buffer.ifr_hwaddr.sa_data, 6);
}
n=sprintf(buf,"Using %s = Interface %d\n", Adapter, ifr.ifr_ifindex);
WritetoConsole(buf);
/*prepare sockaddr_ll*/
/*RAW communication*/
IF->socket_address.sll_family = PF_PACKET;
/*we don't use a protocoll above ethernet layer ->just use anything here*/
IF->socket_address.sll_protocol = htons(ETH_P_IP);
//index of the network device
IF->socket_address.sll_ifindex = ifr.ifr_ifindex;
/*ARP hardware identifier is ethernet*/
IF->socket_address.sll_hatype = ARPHRD_ETHER;
/*target is another host*/
IF->socket_address.sll_pkttype = PACKET_BROADCAST;
/*address length*/
IF->socket_address.sll_halen = ETH_ALEN;
/*MAC - begin*/
memcpy(IF->socket_address.sll_addr, IF->EthDest, 6);
IF->socket_address.sll_addr[6] = 0x00;/*not used*/
IF->socket_address.sll_addr[7] = 0x00;/*not used*/
// n=sprintf(buf,"Using %s Adapter = Interface %d\r", ifr.ifr_ifindex);
// WritetoConsole(buf);
return ((int) ExtProc);
}
static BOOL ReadConfigFile(int Port)
{
//TYPE 1 08FF # Ethernet Type
//ETH 1 FF:FF:FF:FF:FF:FF # Target Ethernet AddrMAP G8BPQ-7 10.2.77.1 # IP 93 for compatibility
//ADAPTER 1 \Device\NPF_{21B601E8-8088-4F7D-96 29-EDE2A9243CF4} # Adapter Name
char buf[256],errbuf[256];
char * Config;
Config = PortConfig[Port];
PCAPInfo[Port].Promiscuous = 1; // Default
PCAPInfo[Port].EtherType=htons(0x08FF); // Default
memset(PCAPInfo[Port].EthDest, 0xff, 6);
if (Config)
{
// Using config from bpq32.cfg
char * ptr1 = Config, * ptr2;
ptr2 = strchr(ptr1, 13);
while(ptr2)
{
memcpy(buf, ptr1, ptr2 - ptr1);
buf[ptr2 - ptr1] = 0;
ptr1 = ptr2 + 2;
ptr2 = strchr(ptr1, 13);
strcpy(errbuf,buf); // save in case of error
if (!ProcessLine(buf, Port, FALSE))
{
WritetoConsole("BPQEther - Bad config record ");
WritetoConsole(errbuf);
WritetoConsole("\n");
}
}
return (TRUE);
}
n=sprintf(buf,"No config info found in bpq32.cfg\n");
WritetoConsole(buf);
return (FALSE);
}
static ProcessLine(char * buf, int Port, BOOL CheckPort)
{
char * ptr;
char * p_port;
char * p_mac;
char * p_Adapter;
char * p_type;
int port;
int a,b,c,d,e,f,num;
ptr = strtok(buf, " \t\n\r");
if(ptr == NULL) return (TRUE);
if(*ptr =='#') return (TRUE); // comment
if(*ptr ==';') return (TRUE); // comment
if (CheckPort)
{
p_port = strtok(NULL, " \t\n\r");
if (p_port == NULL) return (FALSE);
port = atoi(p_port);
if (Port != port) return TRUE; // Not for us
}
if(_stricmp(ptr,"ADAPTER") == 0)
{
p_Adapter = strtok(NULL, " \t\n\r");
strcpy(Adapter,p_Adapter);
return (TRUE);
}
if(_stricmp(ptr,"TYPE") == 0)
{
p_type = strtok(NULL, " \t\n\r");
if (p_type == NULL) return (FALSE);
num=sscanf(p_type,"%x",&a);
if (num != 1) return FALSE;
PCAPInfo[Port].EtherType=htons(a);
return (TRUE);
}
if(_stricmp(ptr,"promiscuous") == 0)
{
ptr = strtok(NULL, " \t\n\r");
if (ptr == NULL) return (FALSE);
PCAPInfo[Port].Promiscuous = atoi(ptr);
return (TRUE);
}
if(_stricmp(ptr,"RXMODE") == 0)
{
p_port = strtok(NULL, " \t\n\r");
if (p_port == NULL) return (FALSE);
if(_stricmp(p_port,"RLI") == 0)
{
PCAPInfo[Port].RLIRX=TRUE;
return (TRUE);
}
if(_stricmp(p_port,"BPQ") == 0)
{
PCAPInfo[Port].RLIRX=FALSE;
return (TRUE);
}
return FALSE;
}
if(_stricmp(ptr,"TXMODE") == 0)
{
p_port = strtok(NULL, " \t\n\r");
if (p_port == NULL) return (FALSE);
if(_stricmp(p_port,"RLI") == 0)
{
PCAPInfo[Port].RLITX=TRUE;
return (TRUE);
}
if(_stricmp(p_port,"BPQ") == 0)
{
PCAPInfo[Port].RLITX=FALSE;
return (TRUE);
}
return FALSE;
}
if(_stricmp(ptr,"DEST") == 0)
{
p_mac = strtok(NULL, " \t\n\r");
if (p_mac == NULL) return (FALSE);
num=sscanf(p_mac,"%x-%x-%x-%x-%x-%x",&a,&b,&c,&d,&e,&f);
if (num != 6) return FALSE;
PCAPInfo[Port].EthDest[0]=a;
PCAPInfo[Port].EthDest[1]=b;
PCAPInfo[Port].EthDest[2]=c;
PCAPInfo[Port].EthDest[3]=d;
PCAPInfo[Port].EthDest[4]=e;
PCAPInfo[Port].EthDest[5]=f;
// strcpy(Adapter,p_Adapter);
return (TRUE);
}
if(_stricmp(ptr,"SOURCE") == 0) // not used, but ignore
return (TRUE);
//
// Bad line
//
return (FALSE);
}
#endif