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-rw-r--r--src/lib/ndpi_utils.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/ndpi_utils.c b/src/lib/ndpi_utils.c
index 8f3c03f72..3f27964c6 100644
--- a/src/lib/ndpi_utils.c
+++ b/src/lib/ndpi_utils.c
@@ -2277,6 +2277,7 @@ int ndpi_is_valid_hostname(char * const str, size_t len) {
for (size_t i = 0; i < len; ++i) {
if((str[i] == '.')
|| (str[i] == '-')
+ || (str[i] == '_')
|| (str[i] == ':')
)
continue; /* Used in hostnames */