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udhcpc: sanitize hostnames in incoming packets. Closes 3979.

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The following options are replaced with string "bad" if they
contain malformed hostname:
HOST_NAME, DOMAIN_NAME, NIS_DOMAIN, TFTP_SERVER_NAME

function                                             old     new   delta
xmalloc_optname_optval                               850     888     +38
attach_option                                        440     443      +3
len_of_option_as_string                               13      14      +1
dhcp_option_lengths                                   13      14      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 43/0)               Total: 43 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2011-12-08 16:41:05 +01:00
parent 53782d9221
commit 7280d2017d
3 changed files with 73 additions and 5 deletions
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3
networking/udhcp/common.h
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@@ -80,6 +80,9 @@ enum {
OPTION_IP = 1,
OPTION_IP_PAIR,
OPTION_STRING,
/* Opts of STRING_HOST type will be sanitized before they are passed
* to udhcpc script's environment: */
OPTION_STRING_HOST,
// OPTION_BOOLEAN,
OPTION_U8,
OPTION_U16,