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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/09/05 15:20:09 UTC

[GitHub] [incubator-nuttx-apps] XinStellaris commented on pull request #1307: netutils/dhcpc:Make DHCP xid random

XinStellaris commented on PR #1307:
URL: https://github.com/apache/incubator-nuttx-apps/pull/1307#issuecomment-1237198338

   I think we should put it in dhcp request, so that if we keep the dhcpc thread, xid will change every time just like the rfc requested.
   
   
   
   ---Original---
   From: "Xiang ***@***.***&gt;
   Date: Mon, Sep 5, 2022 22:56 PM
   To: ***@***.***&gt;;
   Cc: ***@***.******@***.***&gt;;
   Subject: Re: [apache/incubator-nuttx-apps] netutils/dhcpc:Make DHCP xid random(PR #1307)
   
   
   
   
    
   @xiaoxiang781216 commented on this pull request.
    
    
   In netutils/dhcpc/dhcpc.c:
    &gt; @@ -145,7 +146,7 @@ struct dhcpc_state_s   * Private Data   ****************************************************************************/   -static const uint8_t xid[4] = +static uint8_t xid[4] =  
   let's move xid to the context
    
    
   In netutils/dhcpc/dhcpc.c:
    &gt; @@ -665,6 +666,17 @@ int dhcpc_request(FAR void *handle, FAR struct dhcpc_state *presult)    int     retries;    int     state;   +  /* RFC2131: A DHCP client MUST choose 'xid's in such a +   * way as to minimize the chance of using an 'xid' identical to one used +   * by another client. +   */ + +  ret = getrandom(&amp;xid, sizeof(xid), 0);  
   move to dhcpc_open
    
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