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patch #6763: Global DHCP XID can be redefined to something more unique

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This commit is contained in:
goldsimon 2009-04-15 18:48:10 +00:00
parent 9630c9136b
commit a55f354687
2 changed files with 39 additions and 17 deletions
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28
CHANGELOG
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@ -20,18 +20,7 @@ HISTORY
++ New features:
2009-04-15 Simon Goldschmidt
* dhcp.c: patch #6764: DHCP rebind and renew did not send hostnam option;
Converted constant OPTION_MAX_MSG_SIZE to netif->mtu, check if netif->mtu
is big enough in dhcp_start
2009-04-15 Simon Goldschmidt
* netbuf.c: bug #26027: netbuf_chain resulted in pbuf memory leak
2009-04-15 Simon Goldschmidt
* sockets.c, ppp.c: bug #25763: corrected 4 occurrences of SMEMCPY to MEMCPY
2009-04-15 Simon Goldschmidt
* sockets.c: bug #26121: set_errno can be overridden
* dhcp.c: patch #6763: Global DHCP XID can be redefined to something more unique
2009-03-31 Kieran Mansley
* tcp.c, tcp_out.c, tcp_in.c, sys.h, tcp.h, opts.h: add support for
@ -93,6 +82,21 @@ HISTORY
++ Bugfixes:
2009-04-15 Simon Goldschmidt
* dhcp.c: patch #6764: DHCP rebind and renew did not send hostnam option;
Converted constant OPTION_MAX_MSG_SIZE to netif->mtu, check if netif->mtu
is big enough in dhcp_start
2009-04-15 Simon Goldschmidt
* netbuf.c: bug #26027: netbuf_chain resulted in pbuf memory leak
2009-04-15 Simon Goldschmidt
* sockets.c, ppp.c: bug #25763: corrected 4 occurrences of SMEMCPY to MEMCPY
2009-04-15 Simon Goldschmidt
* sockets.c: bug #26121: set_errno can be overridden
2009-04-09 Kieran Mansley (patch from Luca Ceresoli <lucaceresoli>)
* init.c, opt.h: Patch#6774 TCP_QUEUE_OOSEQ breaks compilation when
LWIP_TCP==0

28
src/core/dhcp.c
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@ -86,16 +86,20 @@
#include <string.h>
/** Default for DHCP_GLOBAL_XID is 0xABCD0000
* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
* #define DHCP_GLOBAL_XID rand()
*/
#ifdef DHCP_GLOBAL_XID_HEADER
#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
#endif
/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
* MTU is checked to be big enough in dhcp_start */
#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
/** global transaction identifier, must be
* unique for each DHCP request. We simply increment, starting
* with this value (easy to match with a packet analyzer) */
static u32_t xid = 0xABCD0000;
/* DHCP client state machine functions */
static void dhcp_handle_ack(struct netif *netif);
static void dhcp_handle_nak(struct netif *netif);
@ -1358,6 +1362,20 @@ dhcp_create_request(struct netif *netif)
{
struct dhcp *dhcp;
u16_t i;
#ifndef DHCP_GLOBAL_XID
/** default global transaction identifier starting value (easy to match
* with a packet analyser). We simply increment for each new request.
* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
static u32_t xid = 0xABCD0000;
#else
static u32_t xid;
static u8_t xid_initialised = 0;
if (!xid_initialised) {
xid = DHCP_GLOBAL_XID;
xid_initialised = !xid_initialised;
}
#endif
LWIP_ERROR("dhcp_create_request: netif != NULL", (netif != NULL), return ERR_ARG;);
dhcp = netif->dhcp;
LWIP_ERROR("dhcp_create_request: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);