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router: split router_build_fresh_descriptor() into static functions

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Split the body of router_build_fresh_descriptor() into static functions,
by inserting function prologues and epilogues between existing sections.

Write a new body for router_build_fresh_descriptor() that calls the new
static functions.

Initial refactor with no changes to the body of the old
router_build_fresh_descriptor(), except for the split.

Preparation for testing 29017 and 20918.
This commit is contained in:
teor 2019-01-10 17:11:26 +10:00
parent a798bd40fb
commit 6c5a506cdb
1 changed files with 124 additions and 9 deletions
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133
src/feature/relay/router.c
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@ -1941,18 +1941,15 @@ get_my_declared_family(const or_options_t *options)
return result;
}
/** Build a fresh routerinfo, signed server descriptor, and extra-info document
* for this OR. Set r to the generated routerinfo, e to the generated
* extra-info document. Return 0 on success, -1 on temporary error. Failure to
* generate an extra-info document is not an error and is indicated by setting
* e to NULL. Caller is responsible for freeing generated documents if 0 is
* returned.
/** Build a fresh routerinfo for this OR, without any of the fields that depend
* on the corresponding extrainfo. Set r to the generated routerinfo.
* Return 0 on success, -1 on temporary error. Caller is responsible for
* freeing the generated routerinfo if 0 is returned.
*/
int
router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
static int
router_build_fresh_routerinfo(routerinfo_t **r)
{
routerinfo_t *ri;
extrainfo_t *ei;
uint32_t addr;
char platform[256];
int hibernating = we_are_hibernating();
@ -2057,6 +2054,21 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
ri->declared_family = get_my_declared_family(options);
*r = ri;
return 0;
}
/** Build an extrainfo for this OR, based on the routerinfo ri. Set e to the
* generated extrainfo. Return 0 on success, -1 on temporary error. Failure to
* generate an extrainfo is not an error and is indicated by setting e to
* NULL. Caller is responsible for freeing the generated extrainfo if 0 is
* returned.
*/
static int
router_build_fresh_extrainfo(const routerinfo_t *ri, extrainfo_t **e)
{
extrainfo_t *ei;
/* Now generate the extrainfo. */
ei = tor_malloc_zero(sizeof(extrainfo_t));
ei->cache_info.is_extrainfo = 1;
@ -2067,6 +2079,18 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
memcpy(ei->cache_info.identity_digest, ri->cache_info.identity_digest,
DIGEST_LEN);
*e = ei;
return 0;
}
/** Create a signed descriptor for ei, and add it to ei->cache_info.
* Return ei on success, free ei and return NULL on temporary error.
* Caller is responsible for freeing the returned extrainfo
* (if it is not NULL), including any extra fields set in ei->cache_info.
*/
static extrainfo_t *
router_update_extrainfo_descriptor_body(extrainfo_t *ei)
{
if (extrainfo_dump_to_string(&ei->cache_info.signed_descriptor_body,
ei, get_server_identity_key(),
get_master_signing_keypair()) < 0) {
@ -2085,6 +2109,15 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
DIGEST_SHA256);
}
return ei;
}
/** If ei is not NULL, set the fields in ri that depend on ei.
*/
static void
router_update_routerinfo_from_extrainfo(routerinfo_t *ri,
const extrainfo_t *ei)
{
/* Now finish the router descriptor. */
if (ei) {
memcpy(ri->cache_info.extra_info_digest,
@ -2097,6 +2130,17 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
/* ri was allocated with tor_malloc_zero, so there is no need to
* zero ri->cache_info.extra_info_digest here. */
}
}
/** Create a signed descriptor for ri, and add it to ri->cache_info.
* Return 0 on success, free ri and ei and return -1 on temporary error.
* TODO: freeing ri and ei, but leaving dangling pointers, is a bad interface.
* Caller is responsible for freeing the generated ri and ei if 0 is returned,
* including any extra fields set in ri->cache_info.
*/
static int
router_update_routerinfo_descriptor_body(routerinfo_t *ri, extrainfo_t *ei)
{
if (! (ri->cache_info.signed_descriptor_body =
router_dump_router_to_string(ri, get_server_identity_key(),
get_onion_key(),
@ -2110,8 +2154,27 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
ri->cache_info.signed_descriptor_len =
strlen(ri->cache_info.signed_descriptor_body);
return 0;
}
/** Set the purpose field in ri.
*/
static void
router_update_routerinfo_purpose(routerinfo_t *ri)
{
const or_options_t *options = get_options();
ri->purpose =
options->BridgeRelay ? ROUTER_PURPOSE_BRIDGE : ROUTER_PURPOSE_GENERAL;
}
/** Set the cache_info.send_unencrypted fields in ri and ei.
*/
static void
router_update_info_send_unencrypted(routerinfo_t *ri, extrainfo_t *ei)
{
const or_options_t *options = get_options();
if (options->BridgeRelay) {
/* Bridges shouldn't be able to send their descriptors unencrypted,
anyway, since they don't have a DirPort, and always connect to the
@ -2125,10 +2188,62 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
if (ei)
ei->cache_info.send_unencrypted = 1;
}
}
/** Set signed_descriptor_digest in ri->cache_info.
*/
static void
router_update_routerinfo_digest(routerinfo_t *ri)
{
router_get_router_hash(ri->cache_info.signed_descriptor_body,
strlen(ri->cache_info.signed_descriptor_body),
ri->cache_info.signed_descriptor_digest);
}
/** Build a fresh routerinfo, signed server descriptor, and extra-info document
* for this OR. Set r to the generated routerinfo, e to the generated
* extra-info document. Return 0 on success, -1 on temporary error. Failure to
* generate an extra-info document is not an error and is indicated by setting
* e to NULL. Caller is responsible for freeing generated documents if 0 is
* returned.
*/
int
router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
{
int result = -1;
routerinfo_t *ri = NULL;
extrainfo_t *ei = NULL;
/* TODO: return ri */
result = router_build_fresh_routerinfo(&ri);
if (result < 0)
return result;
/* TODO: return ei */
result = router_build_fresh_extrainfo(ri, &ei);
if (result < 0)
return result;
/* TODO: this function frees ei on failure, instead, goto err */
ei = router_update_extrainfo_descriptor_body(ei);
/* TODO: don't rely on tor_malloc_zero */
router_update_routerinfo_from_extrainfo(ri, ei);
/* TODO: this function frees ri and ei on failure, instead, goto err */
result = router_update_routerinfo_descriptor_body(ri, ei);
if (result < 0)
return result;
/* TODO: fold into router_build_fresh_routerinfo() */
router_update_routerinfo_purpose(ri);
/* TODO: fold into router_update_extrainfo_descriptor_body() and
* router_update_routerinfo_descriptor_body() ? */
router_update_info_send_unencrypted(ri, ei);
/* TODO: fold into router_update_routerinfo_descriptor_body() */
router_update_routerinfo_digest(ri);
if (ei) {
tor_assert(!