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hs: Move link specifier encoding to a function

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This commit only moves code into a function. The client code will need a way
to take a bunch of descriptor link specifier object and encode them into link
specifiers objects.

Make this a public function so it can be used outside of hs_descriptor.c.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2017-07-18 13:56:19 -04:00
parent 6222eae8ca
commit b13ee8e4ae
2 changed files with 64 additions and 43 deletions
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102
src/or/hs_descriptor.c
View File

@ -332,50 +332,10 @@ encode_link_specifiers(const smartlist_t *specs)
SMARTLIST_FOREACH_BEGIN(specs, const hs_desc_link_specifier_t *,
spec) {
link_specifier_t *ls = link_specifier_new();
link_specifier_set_ls_type(ls, spec->type);
switch (spec->type) {
case LS_IPV4:
link_specifier_set_un_ipv4_addr(ls,
tor_addr_to_ipv4h(&spec->u.ap.addr));
link_specifier_set_un_ipv4_port(ls, spec->u.ap.port);
/* Four bytes IPv4 and two bytes port. */
link_specifier_set_ls_len(ls, sizeof(spec->u.ap.addr.addr.in_addr) +
sizeof(spec->u.ap.port));
break;
case LS_IPV6:
{
size_t addr_len = link_specifier_getlen_un_ipv6_addr(ls);
const uint8_t *in6_addr = tor_addr_to_in6_addr8(&spec->u.ap.addr);
uint8_t *ipv6_array = link_specifier_getarray_un_ipv6_addr(ls);
memcpy(ipv6_array, in6_addr, addr_len);
link_specifier_set_un_ipv6_port(ls, spec->u.ap.port);
/* Sixteen bytes IPv6 and two bytes port. */
link_specifier_set_ls_len(ls, addr_len + sizeof(spec->u.ap.port));
break;
link_specifier_t *ls = hs_desc_encode_lspec(spec);
if (ls) {
link_specifier_list_add_spec(lslist, ls);
}
case LS_LEGACY_ID:
{
size_t legacy_id_len = link_specifier_getlen_un_legacy_id(ls);
uint8_t *legacy_id_array = link_specifier_getarray_un_legacy_id(ls);
memcpy(legacy_id_array, spec->u.legacy_id, legacy_id_len);
link_specifier_set_ls_len(ls, legacy_id_len);
break;
}
case LS_ED25519_ID:
{
size_t ed25519_id_len = link_specifier_getlen_un_ed25519_id(ls);
uint8_t *ed25519_id_array = link_specifier_getarray_un_ed25519_id(ls);
memcpy(ed25519_id_array, spec->u.ed25519_id, ed25519_id_len);
link_specifier_set_ls_len(ls, ed25519_id_len);
break;
}
default:
tor_assert(0);
}
link_specifier_list_add_spec(lslist, ls);
} SMARTLIST_FOREACH_END(spec);
{
@ -2575,3 +2535,59 @@ hs_descriptor_clear_intro_points(hs_descriptor_t *desc)
}
}
/* From a descriptor link specifier object spec, returned a newly allocated
* link specifier object that is the encoded representation of spec. Return
* NULL on error. */
link_specifier_t *
hs_desc_encode_lspec(const hs_desc_link_specifier_t *spec)
{
tor_assert(spec);
link_specifier_t *ls = link_specifier_new();
link_specifier_set_ls_type(ls, spec->type);
switch (spec->type) {
case LS_IPV4:
link_specifier_set_un_ipv4_addr(ls,
tor_addr_to_ipv4h(&spec->u.ap.addr));
link_specifier_set_un_ipv4_port(ls, spec->u.ap.port);
/* Four bytes IPv4 and two bytes port. */
link_specifier_set_ls_len(ls, sizeof(spec->u.ap.addr.addr.in_addr) +
sizeof(spec->u.ap.port));
break;
case LS_IPV6:
{
size_t addr_len = link_specifier_getlen_un_ipv6_addr(ls);
const uint8_t *in6_addr = tor_addr_to_in6_addr8(&spec->u.ap.addr);
uint8_t *ipv6_array = link_specifier_getarray_un_ipv6_addr(ls);
memcpy(ipv6_array, in6_addr, addr_len);
link_specifier_set_un_ipv6_port(ls, spec->u.ap.port);
/* Sixteen bytes IPv6 and two bytes port. */
link_specifier_set_ls_len(ls, addr_len + sizeof(spec->u.ap.port));
break;
}
case LS_LEGACY_ID:
{
size_t legacy_id_len = link_specifier_getlen_un_legacy_id(ls);
uint8_t *legacy_id_array = link_specifier_getarray_un_legacy_id(ls);
memcpy(legacy_id_array, spec->u.legacy_id, legacy_id_len);
link_specifier_set_ls_len(ls, legacy_id_len);
break;
}
case LS_ED25519_ID:
{
size_t ed25519_id_len = link_specifier_getlen_un_ed25519_id(ls);
uint8_t *ed25519_id_array = link_specifier_getarray_un_ed25519_id(ls);
memcpy(ed25519_id_array, spec->u.ed25519_id, ed25519_id_len);
link_specifier_set_ls_len(ls, ed25519_id_len);
break;
}
default:
tor_assert_nonfatal_unreached();
link_specifier_free(ls);
ls = NULL;
}
return ls;
}

5
src/or/hs_descriptor.h
View File

@ -18,6 +18,9 @@
#include "crypto_ed25519.h"
#include "torcert.h"
/* Trunnel */
#include "ed25519_cert.h"
/* The earliest descriptor format version we support. */
#define HS_DESC_SUPPORTED_FORMAT_VERSION_MIN 3
/* The latest descriptor format version we support. */
@ -230,6 +233,8 @@ size_t hs_desc_plaintext_obj_size(const hs_desc_plaintext_data_t *data);
hs_desc_intro_point_t *hs_desc_intro_point_new(void);
void hs_desc_intro_point_free(hs_desc_intro_point_t *ip);
link_specifier_t *hs_desc_encode_lspec(const hs_desc_link_specifier_t *spec);
#ifdef HS_DESCRIPTOR_PRIVATE
/* Encoding. */