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authorLennart Poettering <lennart@poettering.net>2015-08-26 20:12:17 +0200
committerLennart Poettering <lennart@poettering.net>2015-08-26 20:45:29 +0200
commit909816257937b24e9c3c7fa669ea79b6ffc33c0f (patch)
treec17d254b72a8c69d6152a21afc560235880d03e6 /src/libsystemd-network
parent2d03c0b803aa822dfb5f0473a1e37c19f7774860 (diff)
dhcp: normalize DHCP host and domain names from leases
Previoulsy, we just checked whether the domain names specified in incoming DHCP leases are valid. Given that validation code actually internally normalizes anyway, it's a good idea to simply do the full normalization and store that in the lease structure. This allows us to remove the manual removal of a trailing dot, if there is one.
Diffstat (limited to 'src/libsystemd-network')
-rw-r--r--src/libsystemd-network/sd-dhcp-lease.c59
1 files changed, 26 insertions, 33 deletions
diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index f2e6cb0ddc..37e187c738 100644
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -489,59 +489,52 @@ int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option, v
lease_parse_u16(option, len, &lease->boot_file_size, 0);
break;
- case DHCP_OPTION_DOMAIN_NAME:
- {
- _cleanup_free_ char *domainname = NULL;
- char *e;
+ case DHCP_OPTION_DOMAIN_NAME: {
+ _cleanup_free_ char *domainname = NULL, *normalized = NULL;
r = lease_parse_string(option, len, &domainname);
if (r < 0)
return r;
- /* Chop off trailing dot of domain name that some DHCP
- * servers send us back. Internally we want to store
- * host names without trailing dots and
- * host_name_is_valid() doesn't accept them. */
- e = endswith(domainname, ".");
- if (e)
- *e = 0;
-
- if (is_localhost(domainname))
- break;
+ r = dns_name_normalize(domainname, &normalized);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to normalize domain name '%s': %m", domainname);
+ return 0;
+ }
- r = dns_name_is_valid(domainname);
- if (r <= 0) {
- if (r < 0)
- log_error_errno(r, "Failed to validate domain name: %s: %m", domainname);
- if (r == 0)
- log_warning("Domain name is not valid, ignoring: %s", domainname);
+ if (is_localhost(normalized)) {
+ log_debug_errno(r, "Detected 'localhost' as suggested hostname, ignoring.");
break;
}
free(lease->domainname);
- lease->domainname = domainname;
- domainname = NULL;
+ lease->domainname = normalized;
+ normalized = NULL;
break;
}
- case DHCP_OPTION_HOST_NAME:
- {
- _cleanup_free_ char *hostname = NULL;
- char *e;
+
+ case DHCP_OPTION_HOST_NAME: {
+ _cleanup_free_ char *hostname = NULL, *normalized = NULL;
r = lease_parse_string(option, len, &hostname);
if (r < 0)
return r;
- e = endswith(hostname, ".");
- if (e)
- *e = 0;
+ r = dns_name_normalize(hostname, &normalized);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to normalize host name '%s': %m", hostname);
+ return 0;
+ }
- if (!hostname_is_valid(hostname, false) || is_localhost(hostname))
- break;
+ if (is_localhost(normalized)) {
+ log_debug_errno(r, "Detected 'localhost' as suggested hostname, ignoring.");
+ return 0;
+ }
- free_and_replace(&lease->hostname, hostname);
- hostname = NULL;
+ free(lease->hostname);
+ lease->hostname = normalized;
+ normalized = NULL;
break;
}