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- Don't try to process the option buffer if there isn't one, and don't

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try to process packets that don't at least have the basic BOOTP guts
  in them.
This commit is contained in:
Ted Lemon 1999-10-08 17:08:34 +00:00
parent e9d8afd106
commit bb404b74d1
2 changed files with 37 additions and 22 deletions
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10
common/discover.c
View File

@ -22,7 +22,7 @@
#ifndef lint
static char copyright[] =
"$Id: discover.c,v 1.15 1999/10/07 06:35:41 mellon Exp $ Copyright (c) 1995, 1996, 1998, 1999 The Internet Software Consortium. All rights reserved.\n";
"$Id: discover.c,v 1.16 1999/10/08 17:08:33 mellon Exp $ Copyright (c) 1995, 1996, 1998, 1999 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
@ -573,6 +573,14 @@ isc_result_t got_one (h)
if (result == 0)
return ISC_R_UNEXPECTED;
/* If we didn't at least get the fixed portion of the BOOTP
packet, drop the packet. We're allowing packets with no
sname or filename, because we're aware of at least one
client that sends such packets, but this definitely falls
into the category of being forgiving. */
if (result < DHCP_FIXED_NON_UDP - DHCP_SNAME_LEN - DHCP_FILE_LEN)
return ISC_R_UNEXPECTED;
if (bootp_packet_handler) {
ifrom.len = 4;
memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);

15
common/options.c
View File

@ -22,7 +22,7 @@
#ifndef lint
static char copyright[] =
"$Id: options.c,v 1.47 1999/10/07 06:42:50 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
"$Id: options.c,v 1.48 1999/10/08 17:08:34 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#define DHCP_OPTION_DATA
@ -1320,20 +1320,26 @@ void do_packet (interface, packet, len, from_port, from, hfrom)
log_info ("Discarding packet with bogus hlen.");
return;
}
/* If there's an option buffer, try to parse it. */
if (decoded_packet -> packet_length >= DHCP_FIXED_NON_UDP + 4) {
if (!parse_options (decoded_packet)) {
if (decoded_packet -> options)
option_state_dereference (&decoded_packet -> options,
option_state_dereference
(&decoded_packet -> options,
"do_packet");
packet_dereference (&decoded_packet, "do_packet");
return;
}
if (decoded_packet -> options_valid &&
(op = lookup_option (&dhcp_universe, decoded_packet -> options,
(op = lookup_option (&dhcp_universe,
decoded_packet -> options,
DHO_DHCP_MESSAGE_TYPE))) {
struct data_string dp;
memset (&dp, 0, sizeof dp);
evaluate_option_cache (&dp, decoded_packet, (struct lease *)0,
evaluate_option_cache (&dp, decoded_packet,
(struct lease *)0,
decoded_packet -> options,
(struct option_state *)0, op);
if (dp.len > 0)
@ -1342,6 +1348,7 @@ void do_packet (interface, packet, len, from_port, from, hfrom)
decoded_packet -> packet_type = 0;
data_string_forget (&dp, "do_packet");
}
}
if (decoded_packet -> packet_type)
dhcp (decoded_packet);