tor_tls_get_buffer_sizes() will not work on openssl 1.1. Patch from yawning

src/common/tortls.c

@@ -2875,12 +2875,23 @@ tor_tls_get_tlssecrets(tor_tls_t *tls, uint8_t *secrets_out)
  * Set *<b>rbuf_capacity</b> to the amount of storage allocated for the read
  * buffer and *<b>rbuf_bytes</b> to the amount actually used.
  * Set *<b>wbuf_capacity</b> to the amount of storage allocated for the write
- * buffer and *<b>wbuf_bytes</b> to the amount actually used. */
-void
+ * buffer and *<b>wbuf_bytes</b> to the amount actually used.
+ *
+ * Return 0 on success, -1 on failure.*/
+int
 tor_tls_get_buffer_sizes(tor_tls_t *tls,
                          size_t *rbuf_capacity, size_t *rbuf_bytes,
                          size_t *wbuf_capacity, size_t *wbuf_bytes)
 {
+#if OPENSSL_VERSION_NUMBER >= OPENSSL_V_SERIES(1,1,0)
+  (void)tls;
+  (void)rbuf_capacity;
+  (void)rbuf_bytes;
+  (void)wbuf_capacity;
+  (void)wbuf_bytes;
+
+  return -1;
+#else
   if (tls->ssl->s3->rbuf.buf)
     *rbuf_capacity = tls->ssl->s3->rbuf.len;
   else
@@ -2891,6 +2902,8 @@ tor_tls_get_buffer_sizes(tor_tls_t *tls,
     *wbuf_capacity = 0;
   *rbuf_bytes = tls->ssl->s3->rbuf.left;
   *wbuf_bytes = tls->ssl->s3->wbuf.left;
+  return 0;
+#endif
 }
 
 #ifdef USE_BUFFEREVENTS

src/common/tortls.h

@@ -92,7 +92,7 @@ size_t tor_tls_get_forced_write_size(tor_tls_t *tls);
 void tor_tls_get_n_raw_bytes(tor_tls_t *tls,
                              size_t *n_read, size_t *n_written);
 
-void tor_tls_get_buffer_sizes(tor_tls_t *tls,
+int tor_tls_get_buffer_sizes(tor_tls_t *tls,
                               size_t *rbuf_capacity, size_t *rbuf_bytes,
                               size_t *wbuf_capacity, size_t *wbuf_bytes);
 

src/or/main.c

@@ -2315,12 +2315,13 @@ dumpstats(int severity)
       if (conn->type == CONN_TYPE_OR) {
         or_connection_t *or_conn = TO_OR_CONN(conn);
         if (or_conn->tls) {
-          tor_tls_get_buffer_sizes(or_conn->tls, &rbuf_cap, &rbuf_len,
-                                   &wbuf_cap, &wbuf_len);
-          tor_log(severity, LD_GENERAL,
-              "Conn %d: %d/%d bytes used on OpenSSL read buffer; "
-              "%d/%d bytes used on write buffer.",
-              i, (int)rbuf_len, (int)rbuf_cap, (int)wbuf_len, (int)wbuf_cap);
+          if (tor_tls_get_buffer_sizes(or_conn->tls, &rbuf_cap, &rbuf_len,
+                                       &wbuf_cap, &wbuf_len) == 0) {
+            tor_log(severity, LD_GENERAL,
+                "Conn %d: %d/%d bytes used on OpenSSL read buffer; "
+                "%d/%d bytes used on write buffer.",
+                i, (int)rbuf_len, (int)rbuf_cap, (int)wbuf_len, (int)wbuf_cap);
+          }
         }
       }
     }