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Make extract_name() easier to call operating on first name in message.

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This commit is contained in:
Simon Kelley
2025-02-07 22:13:31 +00:00
parent 57f0489f38
commit 0ccbdf8087
2 changed files with 22 additions and 24 deletions
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20
src/rfc1035.c
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@@ -29,16 +29,19 @@
return = 1 -> extract OK, compare OK, flip OK
return = 2 -> extract OK, compare failed.
return = 3 -> extract OK, compare failed but only on case.
If pp == NULL, operate on the query name in the packet.
*/
int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
char *name, int func, unsigned int parm)
{
unsigned char *cp = (unsigned char *)name, *p = *pp, *p1 = NULL;
unsigned char *cp = (unsigned char *)name, *p1 = NULL;
unsigned int j, l, namelen = 0, hops = 0;
unsigned int bigmap_counter = 0, bigmap_posn = 0, bigmap_size = parm, bitmap = 0;
int retvalue = 1, case_insens = 1, isExtract = 0, flip = 0, extrabytes = (int)parm;
unsigned int *bigmap = (unsigned int *)name;
unsigned char *p = pp ? *pp : (unsigned char *)(header+1);
if (func == EXTR_NAME_EXTRACT)
isExtract = 1, *cp = 0;
else if (func == EXTR_NAME_NOCASE)
@@ -71,11 +74,14 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
}
else if (!flip && *cp != 0)
retvalue = 2;
if (p1) /* we jumped via compression */
*pp = p1;
else
*pp = p;
if (pp)
{
if (p1) /* we jumped via compression */
*pp = p1;
else
*pp = p;
}
return retvalue;
}