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Ensure standard DHCP message length when sending response to clients (#1985)

This commit is contained in:
Arnim Läuger 2017-05-25 13:59:45 +02:00 committed by Marcel Stör
parent 2c553583ea
commit 216b820d08
2 changed files with 9 additions and 4 deletions
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2
app/include/lwip/app/dhcpserver.h
View File

@ -5,6 +5,8 @@
#define USE_DNS
#define DHCP_MSGOPTIONS_MIN_LEN 312
typedef struct dhcps_state{
sint16_t state;
} dhcps_state;

11
app/lwip/app/dhcpserver.c
View File

@ -298,7 +298,8 @@ static void ICACHE_FLASH_ATTR send_offer(struct dhcps_msg *m)
end = add_offer_options(end);
end = add_end(end);
p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg), PBUF_RAM);
// ensure that not more than the minimum options length is transmitted
p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg) - sizeof(m->options) + DHCP_MSGOPTIONS_MIN_LEN, PBUF_RAM);
#if DHCPS_DEBUG
os_printf("udhcp: send_offer>>p->ref = %d\n", p->ref);
#endif
@ -358,7 +359,8 @@ static void ICACHE_FLASH_ATTR send_nak(struct dhcps_msg *m)
end = add_msg_type(&m->options[4], DHCPNAK);
end = add_end(end);
p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg), PBUF_RAM);
// ensure that not more than the minimum options length is transmitted
p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg) - sizeof(m->options) + DHCP_MSGOPTIONS_MIN_LEN, PBUF_RAM);
#if DHCPS_DEBUG
os_printf("udhcp: send_nak>>p->ref = %d\n", p->ref);
#endif
@ -418,8 +420,9 @@ static void ICACHE_FLASH_ATTR send_ack(struct dhcps_msg *m)
end = add_msg_type(&m->options[4], DHCPACK);
end = add_offer_options(end);
end = add_end(end);
p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg), PBUF_RAM);
// ensure that not more than the minimum options length is transmitted
p = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcps_msg) - sizeof(m->options) + DHCP_MSGOPTIONS_MIN_LEN, PBUF_RAM);
#if DHCPS_DEBUG
os_printf("udhcp: send_ack>>p->ref = %d\n", p->ref);
#endif