[netsniff-ng] [PATCH v2 12/14] trafgen: parser: Add 'drnd()' function for proto fields

[Vadim Kochan]

Add syntax for specify dynamic random function for proto field:

    drnd() | drnd(min, max)

EXAMPLE:

    { udp(sport=drnd()) }
    { udp(sport=drnd(1000, 2000)) }

Signed-off-by: Vadim Kochan <vadi...@gmail.com>
---
 trafgen_parser.y | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/trafgen_parser.y b/trafgen_parser.y
index fd02fc2..215da5f 100644
--- a/trafgen_parser.y
+++ b/trafgen_parser.y
@@ -76,6 +76,7 @@ enum field_expr_type_t {
        FIELD_EXPR_IP4_ADDR,
        FIELD_EXPR_IP6_ADDR,
        FIELD_EXPR_INC,
+       FIELD_EXPR_RND,
 };
 
 struct proto_field_expr {
@@ -429,6 +430,7 @@ static void proto_field_expr_eval(void)
                break;
 
        case FIELD_EXPR_INC:
+       case FIELD_EXPR_RND:
                if (field_expr.val.func.min
                        && field_expr.val.func.min >= field_expr.val.func.max)
                        panic("dinc(): min(%u) can't be >= max(%u)\n",
@@ -738,6 +740,13 @@ field_expr
                          field_expr.val.func.min = $3;
                          field_expr.val.func.max = $5;
                          field_expr.val.func.inc = $7; }
+       | K_DRND '(' ')' { field_expr.type = FIELD_EXPR_RND;
+                         field_expr.val.func.type = PROTO_FIELD_FUNC_RND; }
+       | K_DRND '(' number delimiter number ')'
+                       { field_expr.type = FIELD_EXPR_RND;
+                         field_expr.val.func.type = PROTO_FIELD_FUNC_RND;
+                         field_expr.val.func.min = $3;
+                         field_expr.val.func.max = $5; }
        ;
 
 eth_proto
-- 
2.9.2

-- 
You received this message because you are subscribed to the Google Groups 
"netsniff-ng" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to netsniff-ng+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.