From 212479ad2c9200fa858a37de14a2e5e996f10105 Mon Sep 17 00:00:00 2001 From: Jeremy Sowden Date: Sat, 27 Aug 2022 18:17:17 +0100 Subject: rule, set_elem: fix printing of user data Hitherto, alphanumeric characters have been printed as-is, but anything else was replaced by '\0'. However, this effectively truncates the output. Instead, print any printable character as-is and print anything else as a hexadecimal escape sequence: userdata = { \x01\x04\x01\x00\x00\x00 } Signed-off-by: Jeremy Sowden Signed-off-by: Pablo Neira Ayuso --- src/rule.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'src/rule.c') diff --git a/src/rule.c b/src/rule.c index 0bb1c2a..a1a64bd 100644 --- a/src/rule.c +++ b/src/rule.c @@ -622,8 +622,9 @@ static int nftnl_rule_snprintf_default(char *buf, size_t remain, for (i = 0; i < r->user.len; i++) { char *c = r->user.data; - ret = snprintf(buf + offset, remain, "%c", - isalnum(c[i]) ? c[i] : 0); + ret = snprintf(buf + offset, remain, + isprint(c[i]) ? "%c" : "\\x%02hhx", + c[i]); SNPRINTF_BUFFER_SIZE(ret, remain, offset); } -- cgit v1.2.3