api: improve api string safety

- Remove vl_api_from_api_string
  to prevent use of not nul-terminated strings.
- Rename vl_api_from_api_to_vec -> vl_api_from_api_to_new_vec
  to imply a new vector is created. NOT nul terminated.
- Add vl_api_from_api_to_new_c_string. Returns
  nul terminated string in a new vector.
- Add vl_api_c_string_to_api_string. Convert nul terminated
  string to vl_api_string_t
- Add vl_api_vec_to_api_string. Convert NON nul terminated
  vector to vl_api_string_t

Type: fix

Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
Change-Id: Iadd59b612c0d960a34ad0dd07a9d17f56435c6ea
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>

3 files changed, 4 insertions, 4 deletions

diff --git a/src/vnet/devices/tap/tapv2_api.c b/src/vnet/devices/tap/tapv2_api.c
index e0121a83c2f..3b66bf0d6ec 100644
--- a/src/vnet/devices/tap/tapv2_api.c
+++ b/src/vnet/devices/tap/tapv2_api.c
@@ -134,7 +134,7 @@ vl_api_tap_create_v2_t_handler (vl_api_tap_create_v2_t * mp)
   /* If a tag was supplied... */
   if (vl_api_string_len (&mp->tag))
     {
-      u8 *tag = format (0, "%s%c", vl_api_from_api_string (&mp->tag), 0);
+      u8 *tag = vl_api_from_api_to_new_vec (&mp->tag);
       vnet_set_sw_interface_tag (vnm, tag, ap->sw_if_index);
     }
 
diff --git a/src/vnet/interface_api.c b/src/vnet/interface_api.c
index fe3426cb827..7086c5c4c7b 100644
--- a/src/vnet/interface_api.c
+++ b/src/vnet/interface_api.c
@@ -358,7 +358,7 @@ vl_api_sw_interface_dump_t_handler (vl_api_sw_interface_dump_t * mp)
 
   if (mp->name_filter_valid)
     {
-      filter = vl_api_from_api_to_vec (&mp->name_filter);
+      filter = vl_api_from_api_to_new_vec (&mp->name_filter);
       vec_add1 (filter, 0);	/* Ensure it's a C string for strcasecmp() */
     }
 
diff --git a/src/vnet/ip/punt_api.c b/src/vnet/ip/punt_api.c
index 6ed62a1873c..077b1ac3a69 100644
--- a/src/vnet/ip/punt_api.c
+++ b/src/vnet/ip/punt_api.c
@@ -347,7 +347,7 @@ punt_reason_dump_walk_cb (vlib_punt_reason_t id, const u8 * name, void *args)
 
   mp->context = ctx->context;
   mp->reason.id = clib_host_to_net_u32 (id);
-  vl_api_to_api_string (vec_len (name), (char *) name, &mp->reason.name);
+  vl_api_vec_to_api_string (name, &mp->reason.name);
 
   vl_api_send_msg (ctx->reg, (u8 *) mp);
 
@@ -366,7 +366,7 @@ vl_api_punt_reason_dump_t_handler (vl_api_punt_reason_dump_t * mp)
   punt_reason_dump_walk_ctx_t ctx = {
     .reg = reg,
     .context = mp->context,
-    .name = vl_api_from_api_to_vec (&mp->reason.name),
+    .name = vl_api_from_api_to_new_vec (&mp->reason.name),
   };
 
   punt_reason_walk (punt_reason_dump_walk_cb, &ctx);