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dhcp: add special machine-id parse function

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The original used uuid_parse() but that function did not
work properly since the format of the machine-id is
not compatable with a real uuid.  This patch adds a new
machine_id_parse() routine to correctly convert the
character string of hex digits to a 16 byte binary string.
This commit is contained in:
Gene Czarcinski
2013-02-13 03:01:11 -05:00
committed by Dan Williams
parent b54a4e601d
commit c0efef8c92
1 changed files with 29 additions and 3 deletions
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32
src/dhcp-manager/nm-dhcp-client.c
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@@ -323,6 +323,32 @@ nm_dhcp_client_start_ip4 (NMDHCPClient *self,
return priv->pid ? TRUE : FALSE;
}
/* uuid_parse does not work for machine-id, so we use our own converter */
static gboolean
machine_id_parse (const char *in, uuid_t uu)
{
const char *cp;
int i;
char buf[3];
g_return_val_if_fail (in != NULL, FALSE);
g_return_val_if_fail (strlen (in) == 32, FALSE);
for (i = 0; i < 32; i++, cp++) {
if (!g_ascii_isxdigit (in[i]))
return FALSE;
}
buf[2] = 0;
cp = in;
for (i = 0; i < 16; i++) {
buf[0] = *cp++;
buf[1] = *cp++;
uu[i] = ((unsigned char) strtoul (buf, NULL, 16)) & 0xFF;
}
return TRUE;
}
static GByteArray *
generate_duid_from_machine_id (void)
{
@@ -334,7 +360,7 @@ generate_duid_from_machine_id (void)
gsize sumlen = sizeof (buffer);
const guint16 duid_type = g_htons (4);
uuid_t uuid;
int ret;
gboolean success;
/* Get the machine ID from /etc/machine-id; it's always in /etc no matter
* where our configured SYSCONFDIR is.
@@ -348,10 +374,10 @@ generate_duid_from_machine_id (void)
}
contents = g_strstrip (contents);
ret = uuid_parse (contents, uuid);
success = machine_id_parse (contents, uuid);
g_free (contents);
if (ret != 0) {
if (!success) {
nm_log_warn (LOGD_DHCP6, "Failed to parse " SYSCONFDIR "/machine-id to generate DHCPv6 DUID.");
return NULL;
}