snap_demux_handler.h

一个学习SNMP项目：tmoerlan.

 /*
 * snap_demux_handler.h : functions for retrieving DEMUXed data
 */

/* maximum size of a buffer */
#define SNAP_BUFLEN 3924

/* various implemented protocols */
#define SNAP_UNIX	0x1
#define SNAP_RAWIP	0x2
#define SNAP_UDP	0x4

/* used to pass a handler function */
typedef void (*buffer_handler)(char*);

/* has to be declared in caller application (ip portnumber) */
extern short int receiveport;

/* general functions */
int snap_demux_init(int);	/* initialize the various protocols (see defines above) */
int snap_demux_receive(buffer_handler); /* receive and call handler */
int snap_demux_select();	/* our select(..) wrapper */
void snap_demux_close();		/* close all sockets and shut down */

int snap_demux_handler(buffer_handler);	/* call select(..) and receive a packet */

/* buffer handler functions */

void snap_demux_buffer_noop(char*);			/* do nothing */
void snap_demux_buffer_print(char*);		/* print the contents of the buffer to stderr using local code */
void snap_demux_buffer_print_unsafe(char*);	/* print the contents of the buffer to stderr using fprintf */