From 4cdf56a17376a09612d741054efd11a3016d578c Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 24 Jun 2024 14:30:32 -0400
Subject: Rename "onion_pkey" fields in routerinfo_t, and make them optional.

(Renaming them has forced me to look at every place where they are used, so I
can make sure that they are really optional now.)
---
 src/feature/nodelist/routerinfo_st.h |  9 ++++++---
 src/feature/nodelist/routerlist.c    | 25 +++++++++++++++++++++----
 2 files changed, 27 insertions(+), 7 deletions(-)

(limited to 'src/feature/nodelist')

diff --git a/src/feature/nodelist/routerinfo_st.h b/src/feature/nodelist/routerinfo_st.h
index 50134b2b96..a5c00c85c5 100644
--- a/src/feature/nodelist/routerinfo_st.h
+++ b/src/feature/nodelist/routerinfo_st.h
@@ -33,10 +33,13 @@ struct routerinfo_t {
   /**
    * Public RSA TAP key for onions, ASN.1 encoded.  We store this
    * in its encoded format since storing it as a crypto_pk_t uses
-   * significantly more memory. */
-  char *onion_pkey;
+   * significantly more memory.
+   *
+   * This may be absent.
+   */
+  char *tap_onion_pkey;
   /** Length of onion_pkey, in bytes. */
-  size_t onion_pkey_len;
+  size_t tap_onion_pkey_len;
 
   crypto_pk_t *identity_pkey;  /**< Public RSA key for signing. */
   /** Public curve25519 key for onions */
diff --git a/src/feature/nodelist/routerlist.c b/src/feature/nodelist/routerlist.c
index 63de68dda7..7904f7d032 100644
--- a/src/feature/nodelist/routerlist.c
+++ b/src/feature/nodelist/routerlist.c
@@ -930,8 +930,8 @@ routerinfo_free_(routerinfo_t *router)
   tor_free(router->platform);
   tor_free(router->protocol_list);
   tor_free(router->contact_info);
-  if (router->onion_pkey)
-    tor_free(router->onion_pkey);
+  if (router->tap_onion_pkey)
+    tor_free(router->tap_onion_pkey);
   tor_free(router->onion_curve25519_pkey);
   if (router->identity_pkey)
     crypto_pk_free(router->identity_pkey);
@@ -2957,6 +2957,24 @@ router_reset_descriptor_download_failures(void)
 /** We allow uptime to vary from how much it ought to be by this much. */
 #define ROUTER_ALLOW_UPTIME_DRIFT (6*60*60)
 
+/** Return true iff r1 and r2 have the same TAP onion keys. */
+static int
+router_tap_onion_keys_eq(const routerinfo_t *r1, const routerinfo_t *r2)
+{
+  if (r1->tap_onion_pkey_len != r2->tap_onion_pkey_len)
+    return 0;
+
+  if ((r1->tap_onion_pkey == NULL) && (r2->tap_onion_pkey == NULL)) {
+    return 1;
+  } else if ((r1->tap_onion_pkey != NULL) && (r2->tap_onion_pkey != NULL)) {
+    return tor_memeq(r1->tap_onion_pkey, r2->tap_onion_pkey,
+                     r1->tap_onion_pkey_len);
+  } else {
+    /* One is NULL; one is not. */
+    return 0;
+  }
+}
+
 /** Return true iff the only differences between r1 and r2 are such that
  * would not cause a recent (post 0.1.1.6) dirserver to republish.
  */
@@ -2982,8 +3000,7 @@ router_differences_are_cosmetic(const routerinfo_t *r1, const routerinfo_t *r2)
       r1->ipv6_orport != r2->ipv6_orport ||
       r1->ipv4_dirport != r2->ipv4_dirport ||
       r1->purpose != r2->purpose ||
-      r1->onion_pkey_len != r2->onion_pkey_len ||
-      !tor_memeq(r1->onion_pkey, r2->onion_pkey, r1->onion_pkey_len) ||
+      !router_tap_onion_keys_eq(r1,r2) ||
       !crypto_pk_eq_keys(r1->identity_pkey, r2->identity_pkey) ||
       strcasecmp(r1->platform, r2->platform) ||
       (r1->contact_info && !r2->contact_info) || /* contact_info is optional */
-- 
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