Pi-Hole/dnsmasq
1
0
Fork 0
mirror of https://github.com/pi-hole/dnsmasq.git synced 2025-12-19 18:28:25 +00:00
Code Issues Packages Projects Releases Wiki Activity

Tidy previous commit and add manpage entries for new options.

Browse Source
This commit is contained in:
Simon Kelley
2022-01-15 17:57:57 +00:00
parent 3ab0ad8748
commit 27ce754b3d
4 changed files with 77 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
src/edns0.c
View File

@@ -264,49 +264,62 @@ static void encoder(unsigned char *in, char *out)
out[3] = char64(in[2]);
}
/* OPT_ADD_MAC = MAC is added (if available)
OPT_ADD_MAC + OPT_STRIP_MAC = MAC is replaced, if not available, it is only removed
OPT_STRIP_MAC = MAC is removed */
static size_t add_dns_client(struct dns_header *header, size_t plen, unsigned char *limit,
union mysockaddr *l3, time_t now, int *cacheablep)
{
int maclen, replace = 2; /* can't get mac address, just delete any incoming. */
int replace = 0, maclen = 0;
unsigned char mac[DHCP_CHADDR_MAX];
char encode[18]; /* handle 6 byte MACs */
char encode[18]; /* handle 6 byte MACs ONLY */
if ((maclen = find_mac(l3, mac, 1, now)) == 6)
if ((option_bool(OPT_MAC_B64) || option_bool(OPT_MAC_HEX)) && (maclen = find_mac(l3, mac, 1, now)) == 6)
{
replace = 1;
*cacheablep = 0;
if (option_bool(OPT_MAC_HEX))
print_mac(encode, mac, maclen);
else
{
encoder(mac, encode);
encoder(mac+3, encode+4);
encode[8] = 0;
}
if (option_bool(OPT_STRIP_MAC))
replace = 1;
*cacheablep = 0;
if (option_bool(OPT_MAC_HEX))
print_mac(encode, mac, maclen);
else
{
encoder(mac, encode);
encoder(mac+3, encode+4);
encode[8] = 0;
}
}
else if (option_bool(OPT_STRIP_MAC))
replace = 2;
return add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_NOMDEVICEID, (unsigned char *)encode, strlen(encode), 0, replace);
if (replace != 0 || maclen == 6)
plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_NOMDEVICEID, (unsigned char *)encode, strlen(encode), 0, replace);
return plen;
}
/* OPT_ADD_MAC = MAC is added (if available)
OPT_ADD_MAC + OPT_STRIP_MAC = MAC is replaced, if not available, it is only removed
OPT_STRIP_MAC = MAC is removed */
static size_t add_mac(struct dns_header *header, size_t plen, unsigned char *limit,
union mysockaddr *l3, time_t now, int *cacheablep, const int replace)
union mysockaddr *l3, time_t now, int *cacheablep)
{
int maclen;
int maclen = 0, replace = 0;
unsigned char mac[DHCP_CHADDR_MAX];
if ((maclen = find_mac(l3, mac, 1, now)) != 0)
if (option_bool(OPT_ADD_MAC) && (maclen = find_mac(l3, mac, 1, now)) != 0)
{
*cacheablep = 0;
plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_MAC, mac, maclen, 0, replace);
if (option_bool(OPT_STRIP_MAC))
replace = 1;
}
else if(replace > 0)
{
/* Asked to replace MAC address but it is not available here. We just remove whatever might be there */
plen = add_pseudoheader(header, plen, (unsigned char *)limit, daemon->edns_pktsz, EDNS0_OPTION_MAC, NULL, 0, 0, 2);
}
else if (option_bool(OPT_STRIP_MAC))
replace = 2;
if (replace != 0 || maclen != 0)
plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_MAC, mac, maclen, 0, replace);
return plen;
}
@@ -383,15 +396,28 @@ static size_t calc_subnet_opt(struct subnet_opt *opt, union mysockaddr *source,
return len + 4;
}
/* OPT_CLIENT_SUBNET = client subnet is added
OPT_CLIENT_SUBNET + OPT_STRIP_ECS = client subnet is replaced
OPT_STRIP_ECS = client subnet is removed */
static size_t add_source_addr(struct dns_header *header, size_t plen, unsigned char *limit,
union mysockaddr *source, int *cacheable, const int replace)
union mysockaddr *source, int *cacheable)
{
/* http://tools.ietf.org/html/draft-vandergaast-edns-client-subnet-02 */
int len;
int replace = 0, len = 0;
struct subnet_opt opt;
len = calc_subnet_opt(&opt, source, cacheable);
if (option_bool(OPT_CLIENT_SUBNET))
{
if (option_bool(OPT_STRIP_ECS))
replace = 1;
len = calc_subnet_opt(&opt, source, cacheable);
}
else if (option_bool(OPT_STRIP_ECS))
replace = 2;
else
return plen;
return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, EDNS0_OPTION_CLIENT_SUBNET, (unsigned char *)&opt, len, 0, replace);
}
@@ -499,24 +525,12 @@ static size_t add_umbrella_opt(struct dns_header *header, size_t plen, unsigned
in the reply. Set *cacheable to zero if we add an option which the answer
may depend on. */
size_t add_edns0_config(struct dns_header *header, size_t plen, unsigned char *limit,
union mysockaddr *source, time_t now, int *check_subnet, int *cacheable)
union mysockaddr *source, time_t now, int *cacheable)
{
*check_subnet = 0;
*cacheable = 1;
/* OPT_ADD_MAC = MAC is added (if available)
OPT_ADD_MAC + OPT_STRIP_MAC = MAC is replaced, if not available, it is only removed
OPT_STRIP_MAC = MAC is removed */
if (option_bool(OPT_ADD_MAC))
plen = add_mac(header, plen, limit, source, now, cacheable, option_bool(OPT_STRIP_MAC) ? 1 : 0);
else if (option_bool(OPT_STRIP_MAC))
plen = add_pseudoheader(header, plen, (unsigned char *)limit, daemon->edns_pktsz, EDNS0_OPTION_MAC, NULL, 0, 0, 2);
/* Use --strip-mac also for --add-mac=hex and --add-mac=text */
if (option_bool(OPT_MAC_B64) || option_bool(OPT_MAC_HEX))
plen = add_dns_client(header, plen, limit, source, now, cacheable);
else if (option_bool(OPT_STRIP_MAC))
plen = add_pseudoheader(header, plen, (unsigned char *)limit, daemon->edns_pktsz, EDNS0_OPTION_NOMDEVICEID, NULL, 0, 0, 2);
plen = add_mac(header, plen, limit, source, now, cacheable);
plen = add_dns_client(header, plen, limit, source, now, cacheable);
if (daemon->dns_client_id)
plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_NOMCPEID,
@@ -525,16 +539,7 @@ size_t add_edns0_config(struct dns_header *header, size_t plen, unsigned char *l
if (option_bool(OPT_UMBRELLA))
plen = add_umbrella_opt(header, plen, limit, source, cacheable);
/* OPT_CLIENT_SUBNET = client subnet is added
OPT_CLIENT_SUBNET + OPT_STRIP_ECS = client subnet is replaced
OPT_STRIP_ECS = client subnet is removed */
if (option_bool(OPT_CLIENT_SUBNET))
{
plen = add_source_addr(header, plen, limit, source, cacheable, option_bool(OPT_STRIP_ECS) ? 1 : 0);
*check_subnet = 1;
}
else if (option_bool(OPT_STRIP_ECS))
plen = add_pseudoheader(header, plen, (unsigned char *)limit, daemon->edns_pktsz, EDNS0_OPTION_CLIENT_SUBNET, NULL, 0, 0, 2);
plen = add_source_addr(header, plen, limit, source, cacheable);
return plen;
}