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dhcp server:bugfix softap excedes the range of subnet

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This commit is contained in:
xueyunfei
2022-10-27 18:25:00 +08:00
parent f3012849e8
commit 1ae1723d23
2 changed files with 90 additions and 13 deletions
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64
components/lwip/apps/dhcpserver/dhcpserver.c
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@@ -63,6 +63,42 @@
#define DHCPS_DEBUG 0
#define DHCPS_LOG printf
#define IS_INVALID_SUBNET_MASK(x) (((x-1) | x) != 0xFFFFFFFF)
/* Notes:
* 1. Class a address range 0.0.0.0~127.255.255.255.
* 2. Class b address range 128.0.0.0~191.255.255.255.
* 3. Class c address range 192.0.0.0~223.255.255.255.
*/
#define IS_VALID_CLASSA_SUBNET_MASK(mask) (mask >= 0xFF000000 && mask <= 0xFFFE0000)
#define IS_VALID_CLASSB_SUBNET_MASK(mask) (mask >= 0xFFFF0000 && mask <= 0xFFFFFE00)
#define IS_VALID_CLASSC_SUBNET_MASK(mask) (mask >= 0xFFFFFF00 && mask <= 0xFFFFFFFC)
#define IP_CLASS_HOST_NUM(mask) (0xffffffff & ~mask)
#define DHCP_CHECK_SUBNET_MASK_IP(mask, ip) \
do { \
if (IS_INVALID_SUBNET_MASK(mask)) { \
DHCPS_LOG("dhcps: Illegal subnet mask.\n"); \
return ERR_ARG; \
} else { \
if (IP_CLASSA(ip)) { \
if(!IS_VALID_CLASSA_SUBNET_MASK(mask)) { \
DHCPS_LOG("dhcps: The subnet mask does not match the A address.\n"); \
return ERR_ARG; \
} \
} else if (IP_CLASSB(ip)) { \
if(!IS_VALID_CLASSB_SUBNET_MASK(mask)) { \
DHCPS_LOG("dhcps: The subnet mask does not match the B address.\n"); \
return ERR_ARG; \
} \
} else if (IP_CLASSC(ip)) { \
if(!IS_VALID_CLASSC_SUBNET_MASK(mask)) { \
DHCPS_LOG("dhcps: The subnet mask does not match the C address.\n"); \
return ERR_ARG; \
} \
} \
} \
} while (0)
#define MAX_STATION_NUM CONFIG_LWIP_DHCPS_MAX_STATION_NUM
#define DHCPS_STATE_OFFER 1
@@ -1141,23 +1177,25 @@ static void handle_dhcp(void *arg,
*******************************************************************************/
static void dhcps_poll_set(dhcps_t *dhcps, u32_t ip)
{
u32_t softap_ip = 0, local_ip = 0;
u32_t server_ip = 0, local_ip = 0;
u32_t start_ip = 0;
u32_t end_ip = 0;
u32_t temp_local_ip = 0;
u32_t host_num = 0;
dhcps_lease_t *dhcps_poll = &dhcps->dhcps_poll;
if (dhcps_poll->enable == true) {
softap_ip = htonl(ip);
server_ip = htonl(ip);
start_ip = htonl(dhcps_poll->start_ip.addr);
end_ip = htonl(dhcps_poll->end_ip.addr);
/*config ip information can't contain local ip*/
if ((start_ip <= softap_ip) && (softap_ip <= end_ip)) {
if ((start_ip <= server_ip) && (server_ip <= end_ip)) {
dhcps_poll->enable = false;
} else {
/*config ip information must be in the same segment as the local ip*/
softap_ip >>= 8;
server_ip >>= 8;
if (((start_ip >> 8 != softap_ip) || (end_ip >> 8 != softap_ip))
if (((start_ip >> 8 != server_ip) || (end_ip >> 8 != server_ip))
|| (end_ip - start_ip > DHCPS_MAX_LEASE)) {
dhcps_poll->enable = false;
}
@@ -1165,19 +1203,24 @@ static void dhcps_poll_set(dhcps_t *dhcps, u32_t ip)
}
if (dhcps_poll->enable == false) {
local_ip = softap_ip = htonl(ip);
softap_ip &= 0xFFFFFF00;
local_ip &= 0xFF;
local_ip = server_ip = htonl(ip);
server_ip &= 0xFFFFFF00;
temp_local_ip = local_ip &= 0xFF;
if (local_ip >= 0x80) {
local_ip -= DHCPS_MAX_LEASE;
temp_local_ip -= DHCPS_MAX_LEASE;
} else {
local_ip ++;
}
bzero(dhcps_poll, sizeof(*dhcps_poll));
dhcps_poll->start_ip.addr = softap_ip | local_ip;
dhcps_poll->end_ip.addr = softap_ip | (local_ip + DHCPS_MAX_LEASE - 1);
host_num = IP_CLASS_HOST_NUM(htonl(dhcps->dhcps_mask.addr));
if (host_num > DHCPS_MAX_LEASE) {
host_num = DHCPS_MAX_LEASE;
}
dhcps_poll->start_ip.addr = server_ip | local_ip;
dhcps_poll->end_ip.addr = server_ip | (temp_local_ip + host_num - 1);
dhcps_poll->start_ip.addr = htonl(dhcps_poll->start_ip.addr);
dhcps_poll->end_ip.addr = htonl(dhcps_poll->end_ip.addr);
}
@@ -1229,6 +1272,7 @@ err_t dhcps_start(dhcps_t *dhcps, struct netif *netif, ip4_addr_t ip)
IP4_ADDR(&dhcps->broadcast_dhcps, 255, 255, 255, 255);
dhcps->server_address.addr = ip.addr;
DHCP_CHECK_SUBNET_MASK_IP(htonl(dhcps->dhcps_mask.addr), htonl(dhcps->server_address.addr));
dhcps_poll_set(dhcps, dhcps->server_address.addr);
dhcps->client_address_plus.addr = dhcps->dhcps_poll.start_ip.addr;