From 87fc409a70cccf448072a9ce109a4efb3fcf26e9 Mon Sep 17 00:00:00 2001
From: juga0 <juga@riseup.net>
Date: Sat, 30 Jun 2018 06:16:17 +0000
Subject: [PATCH] Replace bwlist by bw_file and terminator condition

If bandwidth file terminator is found, set end of headers flag
and do not store the line.
If it is not, parse a relay line and check whether it is a header
line.
---
 src/feature/dircache/dirserv.c | 35 ++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/src/feature/dircache/dirserv.c b/src/feature/dircache/dirserv.c
index e7b5239e0b..c3ccc3c8ff 100644
--- a/src/feature/dircache/dirserv.c
+++ b/src/feature/dircache/dirserv.c
@@ -2600,13 +2600,13 @@ measured_bw_line_apply(measured_bw_line_t *parsed_line,
 
 /**
  * Read the measured bandwidth list file, apply it to the list of
- * vote_routerstatus_t and store all the headers in <b>bwlist_headers</b>.
+ * vote_routerstatus_t and store all the headers in <b>bw_file_headers</b>.
  * Returns -1 on error, 0 otherwise.
  */
 int
 dirserv_read_measured_bandwidths(const char *from_file,
                                  smartlist_t *routerstatuses,
-                                 smartlist_t *bwlist_headers)
+                                 smartlist_t *bw_file_headers)
 {
   FILE *fp = tor_fopen_cloexec(from_file, "r");
   int applied_lines = 0;
@@ -2656,7 +2656,11 @@ dirserv_read_measured_bandwidths(const char *from_file,
     goto err;
   }
 
-  smartlist_add_asprintf(bwlist_headers, "timestamp=%ld", file_time);
+  /* If timestamp was correct and bw_file_headers is not NULL,
+   * add timestamp to bw_file_headers */
+  if (bw_file_headers)
+    smartlist_add_asprintf(bw_file_headers, "timestamp=%lu",
+                           (unsigned long)file_time);
 
   if (routerstatuses)
     smartlist_sort(routerstatuses, compare_vote_routerstatus_entries);
@@ -2673,15 +2677,22 @@ dirserv_read_measured_bandwidths(const char *from_file,
         dirserv_cache_measured_bw(&parsed_line, file_time);
         if (measured_bw_line_apply(&parsed_line, routerstatuses) > 0)
           applied_lines++;
-      } else {
-        /* If line does not contain the header separator and it is key_value,
-         * it is probably a KeyValue header.*/
-        if (strcmp(line, "====\n") != 0 &&
-            string_is_key_value(LOG_DEBUG, line)) {
-          line[strlen(line)-1] = '\0';
-          smartlist_add_strdup(bwlist_headers, line);
-        };
-      }
+      /* if the terminator is found, it is the end of header lines, set the
+       * flag but do not store anything */
+      } else if (strcmp(line, BW_FILE_TERMINATOR) == 0)
+        line_is_after_headers = 1;
+      /* if the line was not a correct relay line nor the terminator and
+       * the end of the header lines has not been detected yet
+       * and it is key_value and bw_file_headers did not reach the maximum
+       * number of headers,
+       * then assume this line is a header and add it to bw_file_headers */
+      else if (bw_file_headers &&
+              (line_is_after_headers == 0) &&
+              string_is_key_value(LOG_DEBUG, line) &&
+              (smartlist_len(bw_file_headers) < MAX_BW_FILE_HEADERS_LEN)) {
+        line[strlen(line)-1] = '\0';
+        smartlist_add_strdup(bw_file_headers, line);
+      };
     }
   }