/* Dump a UDP header */
void udp_dump(unsigned char *data, int length, int hexdump)
{
int hdr_length;
int source;
int dest;
hdr_length = get16(data + 4);
source = get16(data + 0);
dest = get16(data + 2);
lprintf(T_PROTOCOL, "UDP:");
lprintf(T_TCPHDR, " len %d %s->", hdr_length, servname(source, "udp"));
lprintf(T_TCPHDR, "%s", servname(dest, "udp"));
if (hdr_length > UDPHDR) {
length -= UDPHDR;
data += UDPHDR;
switch (dest) {
case RIP_PORT:
lprintf(T_TCPHDR, "\n");
rip_dump(data, length);
break;
default:
lprintf(T_TCPHDR, " Data %d\n", length);
data_dump(data, length, hexdump);
break;
}
}
}
/* Dump a UDP header */
void
udp_dump(
FILE *fp,
struct mbuf **bpp,
int32 source,int32 dest,
int check) /* If 0, bypass checksum verify */
{
struct udp udp;
struct pseudo_header ph;
uint csum;
if(bpp == NULL || *bpp == NULL)
return;
fprintf(fp,"UDP:");
/* Compute checksum */
ph.source = source;
ph.dest = dest;
ph.protocol = UDP_PTCL;
ph.length = len_p(*bpp);
if((csum = cksum(&ph,*bpp,ph.length)) == 0)
check = 0; /* No checksum error */
ntohudp(&udp,bpp);
fprintf(fp," len %u",udp.length);
fprintf(fp," %u->%u",udp.source,udp.dest);
if(udp.length > UDPHDR)
fprintf(fp," Data %u",udp.length - UDPHDR);
if(udp.checksum == 0)
check = 0;
if(check)
fprintf(fp," CHECKSUM ERROR (%u)",csum);
putc('\n',fp);
switch(udp.dest){
case IPPORT_RIP:
rip_dump(fp,bpp);
}
}
