From 9c242e950b45ac67b2b741bc4e0c920a9a57cb43 Mon Sep 17 00:00:00 2001
From: rl1987 <rl1987@sdf.lonestar.org>
Date: Wed, 8 Aug 2018 18:47:43 +0300
Subject: [PATCH 1/3] Consider all routerinfo errors other than "not a server"
 transient

---
 src/feature/relay/router.c | 22 ++++++----------------
 src/test/test_policy.c     |  2 +-
 2 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/src/feature/relay/router.c b/src/feature/relay/router.c
index 0cc4887232e..40839f26050 100644
--- a/src/feature/relay/router.c
+++ b/src/feature/relay/router.c
@@ -164,22 +164,12 @@ routerinfo_err_to_string(int err)
 int
 routerinfo_err_is_transient(int err)
 {
-  switch (err) {
-    case TOR_ROUTERINFO_ERROR_NO_EXT_ADDR:
-      return 1;
-    case TOR_ROUTERINFO_ERROR_CANNOT_PARSE:
-      return 1;
-    case TOR_ROUTERINFO_ERROR_NOT_A_SERVER:
-      return 0;
-    case TOR_ROUTERINFO_ERROR_DIGEST_FAILED:
-      return 0; // XXX: bug?
-    case TOR_ROUTERINFO_ERROR_CANNOT_GENERATE:
-      return 1;
-    case TOR_ROUTERINFO_ERROR_DESC_REBUILDING:
-      return 1;
-  }
-
-  return 0;
+  /**
+   * For simplicity, we consider all errors other than
+   * "not a server" transient - see discussion on
+   * https://trac.torproject.org/projects/tor/ticket/27034
+   */
+  return err != TOR_ROUTERINFO_ERROR_NOT_A_SERVER;
 }
 
 /** Replace the current onion key with <b>k</b>.  Does not affect
diff --git a/src/test/test_policy.c b/src/test/test_policy.c
index 4b1adc91f09..6a07e5b1f8d 100644
--- a/src/test/test_policy.c
+++ b/src/test/test_policy.c
@@ -1706,7 +1706,7 @@ test_policies_getinfo_helper_policies(void *arg)
   rv = getinfo_helper_policies(NULL, "exit-policy/full", &answer,
                                &errmsg);
 
-  tt_int_op(rv, OP_EQ, 0);
+  tt_int_op(rv, OP_EQ, -1);
   tt_ptr_op(answer, OP_EQ, NULL);
   tt_ptr_op(errmsg, OP_NE, NULL);
   tt_str_op(errmsg, OP_EQ, "Key digest failed");

From 7a1007861f978abe0703a8fe062ed3c983bccd49 Mon Sep 17 00:00:00 2001
From: rl1987 <rl1987@sdf.lonestar.org>
Date: Wed, 8 Aug 2018 18:56:27 +0300
Subject: [PATCH 2/3] Print stacktrace when crypto_pk_get_digest() fails in
 router_build_fresh_descriptor()

---
 src/feature/relay/router.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/feature/relay/router.c b/src/feature/relay/router.c
index 40839f26050..e4ec01af24c 100644
--- a/src/feature/relay/router.c
+++ b/src/feature/relay/router.c
@@ -2350,8 +2350,8 @@ router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e)
   }
 
   ri->identity_pkey = crypto_pk_dup_key(get_server_identity_key());
-  if (crypto_pk_get_digest(ri->identity_pkey,
-                           ri->cache_info.identity_digest)<0) {
+  if (BUG(crypto_pk_get_digest(ri->identity_pkey,
+                           ri->cache_info.identity_digest) < 0)) {
     routerinfo_free(ri);
     return TOR_ROUTERINFO_ERROR_DIGEST_FAILED;
   }

From 5f2e00241a35f7658bde4f9afb0a758588217e40 Mon Sep 17 00:00:00 2001
From: rl1987 <rl1987@sdf.lonestar.org>
Date: Wed, 8 Aug 2018 19:07:50 +0300
Subject: [PATCH 3/3] Add changes file

---
 changes/bug27034 | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 changes/bug27034

diff --git a/changes/bug27034 b/changes/bug27034
new file mode 100644
index 00000000000..bdb7d29c117
--- /dev/null
+++ b/changes/bug27034
@@ -0,0 +1,6 @@
+  o Minor bugfixes (controller):
+    - Consider all routerinfo errors other than "not a server"
+      to be transient for the purpose of "GETINFO exit-policy/*"
+      controller request. Print stacktrace in the unlikely case
+      of failing to recompute routerinfo digest. Fixes bug 27034;
+      bugfix on 0.3.4.1-alpha.