dhcpc abnormal block
The logic changes are as follows: 1、Loop sending the DISCOVER up to CONFIG_NETUTILS_DHCPC_RETRIES times and exit if failure 2、Loop sending the REQUEST up to CONFIG_NETUTILS_DHCPC_RETRIES times and exit if failure Signed-off-by: songlinzhang <songlinzhang@xiaomi.com>
This commit is contained in:
songlinzhang
Alan Carvalho de Assis
parent
80dcc185f3
commit
98dfaa3eff
@ -579,177 +579,178 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)
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oldaddr.s_addr = 0;
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oldaddr.s_addr = 0;
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netlib_get_ipv4addr(pdhcpc->interface, &oldaddr);
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netlib_get_ipv4addr(pdhcpc->interface, &oldaddr);
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/* Loop until we receive the lease (or an error occurs) */
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/* Set the IP address to INADDR_ANY. */
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newaddr.s_addr = INADDR_ANY;
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netlib_set_ipv4addr(pdhcpc->interface, &newaddr);
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/* Loop sending the DISCOVER up to CONFIG_NETUTILS_DHCPC_RETRIES
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* times
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*/
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retries = 0;
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/* Loop sending DISCOVER until we receive an OFFER from a DHCP
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* server. We will lock on to the first OFFER and decline any
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* subsequent offers (which will happen if there are more than one
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* DHCP servers on the network.
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*/
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state = STATE_INITIAL;
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do
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do
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{
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{
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/* Set the IP address to INADDR_ANY. */
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/* Send the DISCOVER command */
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newaddr.s_addr = INADDR_ANY;
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ninfo("Broadcast DISCOVER\n");
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netlib_set_ipv4addr(pdhcpc->interface, &newaddr);
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if (dhcpc_sendmsg(pdhcpc, presult, DHCPDISCOVER) < 0)
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/* Loop sending the DISCOVER up to CONFIG_NETUTILS_DHCPC_RETRIES
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* times
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*/
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retries = 0;
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/* Loop sending DISCOVER until we receive an OFFER from a DHCP
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* server. We will lock on to the first OFFER and decline any
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* subsequent offers (which will happen if there are more than one
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* DHCP servers on the network.
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*/
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state = STATE_INITIAL;
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do
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{
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/* Send the DISCOVER command */
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ninfo("Broadcast DISCOVER\n");
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if (dhcpc_sendmsg(pdhcpc, presult, DHCPDISCOVER) < 0)
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{
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return ERROR;
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}
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retries++;
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/* Get the DHCPOFFER response */
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result = recv(pdhcpc->sockfd, &pdhcpc->packet,
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sizeof(struct dhcp_msg), 0);
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if (result >= 0)
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{
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msgtype = dhcpc_parsemsg(pdhcpc, result, presult);
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if (msgtype == DHCPOFFER)
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{
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/* Save the servid from the presult so that it is not
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* clobbered by a new OFFER.
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*/
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ninfo("Received OFFER from %08" PRIx32 "\n",
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(uint32_t)ntohl(presult->serverid.s_addr));
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pdhcpc->ipaddr.s_addr = presult->ipaddr.s_addr;
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pdhcpc->serverid.s_addr = presult->serverid.s_addr;
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/* Temporarily use the address offered by the server
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* and break out of the loop.
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*/
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netlib_set_ipv4addr(pdhcpc->interface,
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&presult->ipaddr);
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state = STATE_HAVE_OFFER;
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}
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}
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/* An error has occurred. If this was a timeout error (meaning
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* that nothing was received on this socket for a long period
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* of time). Then loop and send the DISCOVER command again.
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*/
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else if (errno != EAGAIN)
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{
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/* An error other than a timeout was received -- error out */
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return ERROR;
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}
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}
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while (state == STATE_INITIAL &&
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retries < CONFIG_NETUTILS_DHCPC_RETRIES);
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/* If no DHCPOFFER recveived here, error out */
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if (state == STATE_INITIAL)
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{
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{
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return ERROR;
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return ERROR;
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}
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}
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/* Loop sending the REQUEST up to CONFIG_NETUTILS_DHCPC_RETRIES times
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retries++;
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* (if there is no response)
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*/
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retries = 0;
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/* Get the DHCPOFFER response */
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do
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result = recv(pdhcpc->sockfd, &pdhcpc->packet,
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sizeof(struct dhcp_msg), 0);
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if (result >= 0)
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{
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{
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/* Send the REQUEST message to obtain the lease that was offered to
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msgtype = dhcpc_parsemsg(pdhcpc, result, presult);
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* us.
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if (msgtype == DHCPOFFER)
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*/
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ninfo("Send REQUEST\n");
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if (dhcpc_sendmsg(pdhcpc, presult, DHCPREQUEST) < 0)
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{
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{
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return ERROR;
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/* Save the servid from the presult so that it is not
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}
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* clobbered by a new OFFER.
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retries++;
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/* Get the ACK/NAK response to the REQUEST (or timeout) */
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result = recv(pdhcpc->sockfd, &pdhcpc->packet,
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sizeof(struct dhcp_msg), 0);
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if (result >= 0)
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{
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/* Parse the response */
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msgtype = dhcpc_parsemsg(pdhcpc, result, presult);
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/* The ACK response means that the server has accepted
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* our request and we have the lease.
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*/
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*/
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if (msgtype == DHCPACK)
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ninfo("Received OFFER from %08" PRIx32 "\n",
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{
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(uint32_t)ntohl(presult->serverid.s_addr));
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ninfo("Received ACK\n");
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pdhcpc->ipaddr.s_addr = presult->ipaddr.s_addr;
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state = STATE_HAVE_LEASE;
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pdhcpc->serverid.s_addr = presult->serverid.s_addr;
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}
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/* NAK means the server has refused our request. Break out of
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/* Temporarily use the address offered by the server
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* this loop with state == STATE_HAVE_OFFER and send DISCOVER
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* and break out of the loop.
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* again
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*/
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*/
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else if (msgtype == DHCPNAK)
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netlib_set_ipv4addr(pdhcpc->interface,
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{
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&presult->ipaddr);
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ninfo("Received NAK\n");
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state = STATE_HAVE_OFFER;
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break;
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}
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/* If we get any OFFERs from other servers, then decline
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* them now and continue waiting for the ACK from the server
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* that we requested from.
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*/
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else if (msgtype == DHCPOFFER)
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{
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ninfo("Received another OFFER, send DECLINE\n");
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dhcpc_sendmsg(pdhcpc, presult, DHCPDECLINE);
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}
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/* Otherwise, it is something that we do not recognize */
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else
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{
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ninfo("Ignoring msgtype=%d\n", msgtype);
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}
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}
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/* An error has occurred. If this was a timeout error (meaning
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* that nothing was received on this socket for a long period of
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* time). Then break out and send the DISCOVER command again
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* (at most 3 times).
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*/
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else if (errno != EAGAIN)
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{
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/* An error other than a timeout was received */
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netlib_set_ipv4addr(pdhcpc->interface, &oldaddr);
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return ERROR;
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}
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}
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}
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}
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while (state == STATE_HAVE_OFFER &&
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retries < CONFIG_NETUTILS_DHCPC_RETRIES);
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/* An error has occurred. If this was a timeout error (meaning
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* that nothing was received on this socket for a long period
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* of time). Then loop and send the DISCOVER command again.
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*/
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else if (errno != EAGAIN)
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{
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/* An error other than a timeout was received -- error out */
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return ERROR;
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}
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}
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while (state == STATE_INITIAL &&
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retries < CONFIG_NETUTILS_DHCPC_RETRIES);
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/* If no DHCPOFFER recveived here, error out */
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if (state == STATE_INITIAL)
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{
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return ERROR;
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}
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/* Loop sending the REQUEST up to CONFIG_NETUTILS_DHCPC_RETRIES times
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* (if there is no response)
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*/
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retries = 0;
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do
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{
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/* Send the REQUEST message to obtain the lease that was offered to
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* us.
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*/
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ninfo("Send REQUEST\n");
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if (dhcpc_sendmsg(pdhcpc, presult, DHCPREQUEST) < 0)
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{
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return ERROR;
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}
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retries++;
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/* Get the ACK/NAK response to the REQUEST (or timeout) */
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result = recv(pdhcpc->sockfd, &pdhcpc->packet,
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sizeof(struct dhcp_msg), 0);
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if (result >= 0)
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{
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/* Parse the response */
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msgtype = dhcpc_parsemsg(pdhcpc, result, presult);
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/* The ACK response means that the server has accepted
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* our request and we have the lease.
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*/
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if (msgtype == DHCPACK)
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{
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ninfo("Received ACK\n");
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state = STATE_HAVE_LEASE;
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}
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/* NAK means the server has refused our request. Break out of
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* this loop with state == STATE_HAVE_OFFER and send DISCOVER
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* again
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*/
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else if (msgtype == DHCPNAK)
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{
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ninfo("Received NAK\n");
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break;
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}
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/* If we get any OFFERs from other servers, then decline
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* them now and continue waiting for the ACK from the server
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* that we requested from.
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*/
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else if (msgtype == DHCPOFFER)
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{
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ninfo("Received another OFFER, send DECLINE\n");
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dhcpc_sendmsg(pdhcpc, presult, DHCPDECLINE);
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}
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/* Otherwise, it is something that we do not recognize */
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else
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{
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ninfo("Ignoring msgtype=%d\n", msgtype);
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}
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}
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/* An error has occurred. If this was a timeout error (meaning
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* that nothing was received on this socket for a long period of
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* time). Then break out and send the DISCOVER command again
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* (at most 3 times).
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*/
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else if (errno != EAGAIN)
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{
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/* An error other than a timeout was received */
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netlib_set_ipv4addr(pdhcpc->interface, &oldaddr);
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return ERROR;
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}
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}
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while (state == STATE_HAVE_OFFER &&
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retries < CONFIG_NETUTILS_DHCPC_RETRIES);
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/* If no DHCPLEASE recveived here, error out */
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if (state != STATE_HAVE_LEASE)
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{
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return ERROR;
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}
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}
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while (state != STATE_HAVE_LEASE);
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ninfo("Got IP address %d.%d.%d.%d\n",
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ninfo("Got IP address %d.%d.%d.%d\n",
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(int)((presult->ipaddr.s_addr) & 0xff),
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(int)((presult->ipaddr.s_addr) & 0xff),
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