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netutils/dhcpc:receiving unexpected packet not leading to dhcp retry.

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Signed-off-by: 田昕 <tianxin7@xiaomi.com>
This commit is contained in:
田昕 2022-09-07 15:29:26 +08:00 committed by Xiang Xiao
parent 3837091582
commit 21e1ef11da
1 changed files with 91 additions and 81 deletions
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20
netutils/dhcpc/dhcpc.c
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@ -680,6 +680,7 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
uint8_t msgtype;
int retries;
int state;
clock_t start;
/* RFC2131: For example, a client may choose a different,
* random initial 'xid' each time the client is rebooted, and
@ -730,6 +731,9 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
/* Get the DHCPOFFER response */
start = clock();
do
{
result = recv(pdhcpc->sockfd, &pdhcpc->packet,
sizeof(struct dhcp_msg), 0);
if (result >= 0)
@ -768,6 +772,9 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
return ERROR;
}
}
while (state == STATE_INITIAL && TICK2MSEC(clock() - start) <
CONFIG_NETUTILS_DHCPC_RECV_TIMEOUT_MS);
}
while (state == STATE_INITIAL &&
retries < CONFIG_NETUTILS_DHCPC_RETRIES);
@ -804,6 +811,9 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
/* Get the ACK/NAK response to the REQUEST (or timeout) */
start = clock();
do
{
result = recv(pdhcpc->sockfd, &pdhcpc->packet,
sizeof(struct dhcp_msg), 0);
if (result >= 0)
@ -822,15 +832,12 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
state = STATE_HAVE_LEASE;
}
/* NAK means the server has refused our request. Break out of
* this loop with state == STATE_HAVE_OFFER and send DISCOVER
* again
*/
/* NAK means the server has refused our request */
else if (msgtype == DHCPNAK)
{
ninfo("Received NAK\n");
break;
return ERROR;
}
/* If we get any OFFERs from other servers, then decline
@ -866,6 +873,9 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
return ERROR;
}
}
while (state == STATE_HAVE_OFFER && TICK2MSEC(clock() - start) <
CONFIG_NETUTILS_DHCPC_RECV_TIMEOUT_MS);
}
while (state == STATE_HAVE_OFFER &&
retries < CONFIG_NETUTILS_DHCPC_RETRIES);