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Initial code to do authoritative DNS.

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This commit is contained in:
Simon Kelley
2012-11-28 21:27:02 +00:00
parent 8e4b87918f
commit 4f7b304f53
15 changed files with 705 additions and 191 deletions
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35
src/rfc1035.c
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@@ -16,10 +16,6 @@
#include "dnsmasq.h"
static int add_resource_record(struct dns_header *header, char *limit, int *truncp,
unsigned int nameoffset, unsigned char **pp,
unsigned long ttl, unsigned int *offset, unsigned short type,
unsigned short class, char *format, ...);
#define CHECK_LEN(header, pp, plen, len) \
((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
@@ -27,8 +23,8 @@ static int add_resource_record(struct dns_header *header, char *limit, int *trun
#define ADD_RDLEN(header, pp, plen, len) \
(!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
static int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
char *name, int isExtract, int extrabytes)
int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
char *name, int isExtract, int extrabytes)
{
unsigned char *cp = (unsigned char *)name, *p = *pp, *p1 = NULL;
unsigned int j, l, hops = 0;
@@ -173,7 +169,7 @@ static int extract_name(struct dns_header *header, size_t plen, unsigned char **
/* Max size of input string (for IPv6) is 75 chars.) */
#define MAXARPANAME 75
static int in_arpa_name_2_addr(char *namein, struct all_addr *addrp)
int in_arpa_name_2_addr(char *namein, struct all_addr *addrp)
{
int j;
char name[MAXARPANAME+1], *cp1;
@@ -333,7 +329,7 @@ static unsigned char *skip_name(unsigned char *ansp, struct dns_header *header,
return ansp;
}
static unsigned char *skip_questions(struct dns_header *header, size_t plen)
unsigned char *skip_questions(struct dns_header *header, size_t plen)
{
int q;
unsigned char *ansp = (unsigned char *)(header+1);
@@ -1189,8 +1185,8 @@ int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name,
return 0;
}
static int add_resource_record(struct dns_header *header, char *limit, int *truncp, unsigned int nameoffset, unsigned char **pp,
unsigned long ttl, unsigned int *offset, unsigned short type, unsigned short class, char *format, ...)
int add_resource_record(struct dns_header *header, char *limit, int *truncp, unsigned int nameoffset, unsigned char **pp,
unsigned long ttl, unsigned int *offset, unsigned short type, unsigned short class, char *format, ...)
{
va_list ap;
unsigned char *sav, *p = *pp;
@@ -1201,8 +1197,19 @@ static int add_resource_record(struct dns_header *header, char *limit, int *trun
if (truncp && *truncp)
return 0;
va_start(ap, format); /* make ap point to 1st unamed argument */
if (nameoffset != 0)
{
PUTSHORT(nameoffset | 0xc000, p);
}
else
{
p = do_rfc1035_name(p, va_arg(ap, char *));
*p++ = 0;
}
PUTSHORT(nameoffset | 0xc000, p);
PUTSHORT(type, p);
PUTSHORT(class, p);
PUTLONG(ttl, p); /* TTL */
@@ -1210,8 +1217,6 @@ static int add_resource_record(struct dns_header *header, char *limit, int *trun
sav = p; /* Save pointer to RDLength field */
PUTSHORT(0, p); /* Placeholder RDLength */
va_start(ap, format); /* make ap point to 1st unamed argument */
for (; *format; format++)
switch (*format)
{
@@ -1857,7 +1862,3 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
return ansp - (unsigned char *)header;
}