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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2015-10-24 04:45:22 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2015-10-24 04:45:22 +0200 |
| commit | 9a512176686d5f1548dc1e1c610af440a3ee0d73 (patch) | |
| tree | 06fe3e63ae4879e8efa4282203a4db6a8088e718 | |
| parent | 941e7a491971574e5d06227f8dc63806335b8745 (diff) | |
| download | busybox-9a512176686d5f1548dc1e1c610af440a3ee0d73.tar.gz | |
dumpleases: make host names sanitized to shell-friendly condition
function old new delta
add_lease 271 298 +27
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | networking/udhcp/leases.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c index 745340ad3..844bb60b1 100644 --- a/networking/udhcp/leases.c +++ b/networking/udhcp/leases.c @@ -65,10 +65,15 @@ struct dyn_lease* FAST_FUNC add_lease( if (hostname_len > sizeof(oldest->hostname)) hostname_len = sizeof(oldest->hostname); p = safe_strncpy(oldest->hostname, hostname, hostname_len); - /* sanitization (s/non-ASCII/^/g) */ + /* + * Sanitization (s/bad_char/./g). + * The intent is not to allow only "DNS-valid" hostnames, + * but merely make dumpleases output safe for shells to use. + * We accept "0-9A-Za-z._-", all other chars turn to dots. + */ while (*p) { - if (*p < ' ' || *p > 126) - *p = '^'; + if (!isalnum(*p) && *p != '-' && *p != '_') + *p = '.'; p++; } } |