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#include <errno.h>
#include <resolv.h>
/* Ripped from glibc 2.4 sources. */
/*
* ns_name_skip(ptrptr, eom)
* Advance *ptrptr to skip over the compressed name it points at.
* return:
* 0 on success, -1 (with errno set) on failure.
*/
int ns_name_skip(const u_char **ptrptr, const u_char *eom)
{
const u_char *cp;
u_int n;
cp = *ptrptr;
while (cp < eom && (n = *cp++) != 0)
{
/* Check for indirection. */
switch (n & NS_CMPRSFLGS) {
case 0: /* normal case, n == len */
cp += n;
continue;
case NS_CMPRSFLGS: /* indirection */
cp++;
break;
default: /* illegal type */
errno = EMSGSIZE;
return (-1);
}
break;
}
if (cp > eom)
{
errno = EMSGSIZE;
return (-1);
}
*ptrptr = cp;
return (0);
}
int dn_skipname(const u_char *ptr, const u_char *eom)
{
const u_char *saveptr = ptr;
if(ns_name_skip(&ptr, eom) == -1)
return (-1);
return (ptr - saveptr);
}
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