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Add DHCPv6 ntp-server (56) option handling.

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There was discussion in the past regarding DHCPv6 NTP server option
which needs special subclassing per RFC5908.

Patch adds support for unicast, multicast IPv6 address and for FQDN string,
preserving possibly used (as suggested earlier) hex value.

Unfortunately it's still not fully free from limitations - only address list or
only fqdn value list is possible, not mixed due current
state option parsing & flagging.
This commit is contained in:
Vladislav Grishenko authored and Simon Kelley committed 2020-03-08 15:34:34 +00:00
1 parent b594e8defa
commit dded78b233
4 files changed
+41 -8
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src/option.c
+16 -3
View File
@@ -1260,6 +1260,12 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
if (!found_colon)
is_addr6 = 0;
#ifdef HAVE_DHCP6
/* NTP server option takes hex, addresses or FQDN */
if (is6 && new->opt == OPTION6_NTP_SERVER && !is_hex)
opt_len |= is_addr6 ? OT_ADDR_LIST : OT_RFC1035_NAME;
#endif
/* We know that some options take addresses */
if (opt_len & OT_ADDR_LIST)
@@ -1521,8 +1527,9 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
}
else if (comma && (opt_len & OT_RFC1035_NAME))
{
unsigned char *p = NULL, *newp, *end;
unsigned char *p = NULL, *q, *newp, *end;
int len = 0;
int header_size = (is6 && new->opt == OPTION6_NTP_SERVER) ? 4 : 0;
arg = comma;
comma = split(arg);
@@ -1532,7 +1539,7 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
if (!dom)
goto_err(_("bad domain in dhcp-option"));
newp = opt_malloc(len + strlen(dom) + 2);
newp = opt_malloc(len + header_size + strlen(dom) + 2);
if (p)
{
@@ -1541,8 +1548,14 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
}
p = newp;
end = do_rfc1035_name(p + len, dom, NULL);
q = p + len;
end = do_rfc1035_name(q + header_size, dom, NULL);
*end++ = 0;
if (is6 && new->opt == OPTION6_NTP_SERVER)
{
PUTSHORT(NTP_SUBOPTION_SRV_FQDN, q);
PUTSHORT(end - q - 2, q);
}
len = end - p;
free(dom);