From eeef1270f5cc3c6872676d57c6d2befe372a6f20 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Mon, 14 Aug 2017 21:23:50 +0200
Subject: [PATCH] Only keep at most 5 Address hints.

---
 src/conf.c     | 32 +++++++++++++-------------------
 src/conf.h     |  4 ++--
 src/meshlink.c |  2 +-
 3 files changed, 16 insertions(+), 22 deletions(-)

diff --git a/src/conf.c b/src/conf.c
index c5c3264e..ceca04db 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -383,8 +383,8 @@ bool write_host_config(struct meshlink_handle *mesh, const struct splay_tree_t *
 	return write_config_file(config_tree, filename);
 }
 
-bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, bool replace) {
-	assert(mesh && name && key && (replace || value));
+bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, int trim) {
+	assert(mesh && name && key);
 
 	char filename[PATH_MAX];
 	char tmpname[PATH_MAX];
@@ -410,7 +410,12 @@ bool modify_config_file(struct meshlink_handle *mesh, const char *name, const ch
 
 	char buf[4096];
 	char *sep;
-	bool found = false;
+	int found = 0;
+
+	if(value) {
+		fprintf(fw, "%s = %s\n", key, value);
+		found++;
+	}
 
 	while(readline(fr, buf, sizeof(buf))) {
 		if(!*buf || *buf == '#')
@@ -426,20 +431,13 @@ bool modify_config_file(struct meshlink_handle *mesh, const char *name, const ch
 			goto copy;
 		}
 
-		if(!value) {
-			found = true;
+		// We found the key and the value. We already added it at the top, so ignore this one.
+		if(sep[1] == '=' && sep[2] == ' ' && !strcmp(sep + 3, value))
 			continue;
-		}
-
-		// We found the key and the value. Keep one copy around.
-		if(sep[1] == '=' && sep[2] == ' ' && !strcmp(sep + 3, value)) {
-			if(found)
-				continue;
-			found = true;
-		}
 
 		// We found the key but with a different value, delete it if wanted.
-		if(!found && replace)
+		found++;
+		if((!value || trim) && found > trim)
 			continue;
 
 		*sep = ' ';
@@ -453,10 +451,6 @@ copy:
 
 	fclose(fr);
 
-	// Add new key/value pair if necessary
-	if(!found && value)
-		fprintf(fw, "%s = %s\n", key, value);
-
 	if(ferror(fw))
 		error = true;
 
@@ -488,5 +482,5 @@ copy:
 }
 
 bool append_config_file(meshlink_handle_t *mesh, const char *name, const char *key, const char *value) {
-	return modify_config_file(mesh, name, key, value, false);
+	return modify_config_file(mesh, name, key, value, 0);
 }
diff --git a/src/conf.h b/src/conf.h
index 715f9965..fd48ea64 100644
--- a/src/conf.h
+++ b/src/conf.h
@@ -52,7 +52,7 @@ extern bool write_config_file(const struct splay_tree_t *, const char *);
 extern bool read_server_config(struct meshlink_handle *mesh);
 extern bool read_host_config(struct meshlink_handle *mesh, struct splay_tree_t *, const char *);
 extern bool write_host_config(struct meshlink_handle *mesh, const struct splay_tree_t *, const char *);
-extern bool modify_config_file(struct meshlink_handle *mesh, const char *, const char *, const char *, bool);
-extern bool append_config_file(struct meshlink_handle *mesh, const char *, const char *, const char *);
+extern bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, int trim);
+extern bool append_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value);
 
 #endif
diff --git a/src/meshlink.c b/src/meshlink.c
index 6e03e63b..5d75e068 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -2085,7 +2085,7 @@ void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const
 	if(host && port) {
 		xasprintf(&str, "%s %s", host, port);
 		if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0))
-			append_config_file(mesh, node->name, "Address", str);
+			modify_config_file(mesh, node->name, "Address", str, 5);
 		else
 			logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
 	}
-- 
2.39.2