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common.h
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common.h
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#ifndef COMMON_H
#define COMMON_H
/*--------------------------------------------------------------------*/
#define MAXSTRING 1024
#define MAXIFACES 32
#define MAXROUTES 32
#define MAXCACHES 32
#define MAXHOSTS 32
#define MAXNIGHBORS 32
#define MAXDESTNETS 32
#define INFINITY 100
#define CONFIGPATH "./etc"
#define HOSTSFILE "hosts"
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* hardware address is 6 bytes */
typedef unsigned char HwAddr[6];
/* IP address is 4 bytes */
typedef unsigned long IpAddr;
/* hardware broadcast address */
extern HwAddr BCASTADDR;
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* packet types */
#define ARP 1
#define IP 2
#define DVRP 3
/* arp operations */
#define ARP_REQUEST 1
#define ARP_RESPONS 2
/* structure of an ethernet pkt */
typedef struct __ethpkt
{
/* destination address */
HwAddr dst;
/* source address */
HwAddr src;
/* type of packet */
int typ;
/* actual payload */
char * dat;
} EthPkt;
/* structure of an arp pkt */
typedef struct __arppkt
{
/* operation */
int operation;
/* sender's hw address */
HwAddr senderhwaddr;
/* sender's ip address */
IpAddr senderipaddr;
/* target's hw address */
HwAddr targethwaddr;
/* target's ip address */
IpAddr targetipaddr;
} ArpPkt;
/* structure of an ip pkt */
typedef struct __ippkt
{
/* source address */
IpAddr src;
/* destination address */
IpAddr dst;
/* length of payload */
int len;
/* actual payload */
char * dat;
} IpPkt;
/* structure of a distance vector entry */
typedef struct __dventry
{
/* destination network prefix */
IpAddr dnet;
/* network address mask */
IpAddr mask;
/* distance to the destination */
int dist;
} DvEntry;
/* structure of a dvrp pkt */
typedef struct __dvrppkt
{
/* source address */
IpAddr src;
/* size of the vector */
int siz;
/* distance vector */
DvEntry * vec;
} DvrpPkt;
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* recv an ether packet */
extern EthPkt *recvethpkt(int sd);
/* send an ether pkt */
extern void sendethpkt(int sd, EthPkt *ethpkt);
/* output packet contents */
extern void showethpkt(EthPkt *ethpkt);
extern void showippkt(IpPkt *ippkt);
extern void showdvrppkt(DvrpPkt *dvrppkt);
/* free up space */
extern void freeethpkt(EthPkt *ethpkt);
extern void freeippkt(IpPkt *ippkt);
extern void freedvrppkt(DvrpPkt *dvrppkt);
/*--------------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/* return ip addr given name */
extern IpAddr nametoipaddr(char *name);
/* return name given ip addr */
extern char *ipaddrtoname(IpAddr addr);
/* convert string to ip address */
extern IpAddr strtoipaddr(char *str);
/* convert ip addres to string */
extern char *ipaddrtostr(IpAddr adr);
/* convert string to hardware address */
extern int strtohwaddr(char *str, HwAddr adr);
/* convert hardware address to string */
extern int hwaddrtostr(HwAddr adr, char *str);
/* compare two hardware addresses */
extern int hwaddrcmp(HwAddr adr1, HwAddr adr2);
/* copy hard address from adr2 to adr1 */
extern void hwaddrcpy(HwAddr adr1, HwAddr adr2);
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/* get the current time in secs (since 1970) */
extern int getcurtime();
/* convert secs to hour:min:sec format */
extern char *timetostring(long secs);
/* set the timer, generates a SIGALRM signal */
extern void setalarm(int interval);
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/* info on each interface */
typedef struct __ifaceentry
{
/* interface name */
char * ifname;
/* name of the net */
char * subnet;
/* hardware address */
HwAddr hwaddr;
/* ip address */
IpAddr ipaddr;
/* network address mask */
IpAddr mask;
/* corresponding socket */
int socket;
/* cost to reach the net */
int dist;
} IfaceEntry;
/* total number of interfaces */
extern int numfaces;
/* interface table */
extern IfaceEntry ifaces[];
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/* info on each route */
typedef struct __routeentry
{
/* destination network prefix */
IpAddr dnet;
/* network address mask */
IpAddr mask;
/* next hop router */
IpAddr next;
/* outgoing interface */
int face;
/* distance to the destination */
int dist;
} RouteEntry;
/* number of entries in the routing table */
extern int numrouts;
/* routing table */
extern RouteEntry routes[MAXROUTES];
/*----------------------------------------------------------------*/
#endif