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udhcpc: add a cooment about sanitizing DHCP_DOMAIN_NAME, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-08-01 13:36:36 +02:00
parent 48ec979ed1
commit 02cf149ed7
1 changed files with 6 additions and 0 deletions
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6
networking/udhcp/dhcpc.c
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@ -274,6 +274,12 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
case OPTION_STRING_HOST:
memcpy(dest, option, len);
dest[len] = '\0';
//TODO: it appears option 15 DHCP_DOMAIN_NAME is often abused
//by DHCP admins to contain a space-separated list of domains,
//not one domain name (presumably, to work as list of search domains,
//instead of using proper option 119 DHCP_DOMAIN_SEARCH).
//Currently, good_hostname() balks on strings containing spaces.
//Do we need to allow it? Only for DHCP_DOMAIN_NAME option?
if (type == OPTION_STRING_HOST && !good_hostname(dest))
safe_strncpy(dest, "bad", len);
return ret;