systemd can rename network interfaces. We should look at LHOST_IFACES
variable for pre-defined test interface names.

Signed-off-by: Alexey Kodanev <[email protected]>
---
v2: use sscanf() instead of strchr()
    allocate buffer on the stack

 testcases/network/lib6/in6_02.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/testcases/network/lib6/in6_02.c b/testcases/network/lib6/in6_02.c
index fea1827..7cb3626 100644
--- a/testcases/network/lib6/in6_02.c
+++ b/testcases/network/lib6/in6_02.c
@@ -255,4 +255,23 @@ void initest(void)
 void setup(void)
 {
        TEST_PAUSE;
+
+       tst_resm(TINFO, "get interface name from LHOST_IFACES var");
+
+       char *ifnames = getenv("LHOST_IFACES");
+
+       if (!ifnames) {
+               tst_resm(TWARN, "LHOST_IFACES not defined, default to eth0");
+               return;
+       }
+
+       static char name[256];
+
+       sscanf(ifnames, "%255s", name);
+
+       if (!strcmp(name, n2i[1].name))
+               return;
+
+       tst_resm(TINFO, "change default 'eth0' name to '%s'", name);
+       n2i[1].name = name;
 }
-- 
1.7.1


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