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udhcpc: do in fact not allow hostname components which start with dash

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function                                             old     new   delta
xmalloc_optname_optval                               879     893     +14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-08-01 13:16:05 +02:00
parent 3550bc494d
commit 48ec979ed1
1 changed files with 6 additions and 4 deletions
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10
networking/udhcp/dhcpc.c
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@ -160,8 +160,8 @@ static int mton(uint32_t mask)
#if ENABLE_FEATURE_UDHCPC_SANITIZEOPT
/* Check if a given label represents a valid DNS label
* Return pointer to the first character after the label upon success,
* NULL otherwise.
* Return pointer to the first character after the label
* (NUL or dot) upon success, NULL otherwise.
* See RFC1035, 2.3.1
*/
/* We don't need to be particularly anal. For example, allowing _, hyphen
@ -173,8 +173,10 @@ static int mton(uint32_t mask)
static const char *valid_domain_label(const char *label)
{
unsigned char ch;
unsigned pos = 0;
//unsigned pos = 0;
if (label[0] == '-')
return NULL;
for (;;) {
ch = *label;
if ((ch|0x20) < 'a' || (ch|0x20) > 'z') {
@ -187,7 +189,7 @@ static const char *valid_domain_label(const char *label)
}
}
label++;
pos++;
//pos++;
//Do we want this?
//if (pos > 63) /* NS_MAXLABEL; labels must be 63 chars or less */
// return NULL;