[ECOS] network interfaces

[ECOS] network interfaces

[Bass8tt8]

Hi,

i have a function ( on Linux work well ) that get the list and the numbers
of network interfaces excluding the LOOPBACK INTERFACE, but on ecos this
dosn't work  :
for debugging i print the name of interface finded : printf ("scheda_lan :
%s\n",ifReq.ifr_name);
but "eth0" there isn't ...  and this function return me always 0 !

Ps: in Main () i do init_all_network_interfaces() !

************************************************  CODE
*********************************************

int ILibGetLocalIPAddressList(int** pp_int)
{
 char szBuffer[16*sizeof(struct ifreq)];
 struct ifconf ifConf;
 struct ifreq ifReq;
 int nResult;
 int LocalSock;
 struct sockaddr_in LocalAddr;
 int tempresults[16];
 int ctr=0;
 int i;

 // Create an unbound datagram socket to do the SIOCGIFADDR ioctl on.
 if ((LocalSock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 {
  DEBUGSTATEMENT(printf("Can't do that\r\n"));
  //exit(1);
 }
 /// Get the interface configuration information...
 ifConf.ifc_len = sizeof szBuffer;
 ifConf.ifc_ifcu.ifcu_buf = (caddr_t)szBuffer;
 nResult = ioctl(LocalSock, SIOCGIFCONF, &ifConf);
 if (nResult < 0)
 {
  DEBUGSTATEMENT(printf("ioctl error\r\n"));
  //exit(1);
 }
 // Cycle through the list of interfaces looking for IP addresses.
 for (i = 0;(i < ifConf.ifc_len);)
 {
  struct ifreq *pifReq = (struct ifreq *)((caddr_t)ifConf.ifc_req + i);
  i += sizeof *pifReq;
  // See if this is the sort of interface we want to deal with.
  strcpy (ifReq.ifr_name, pifReq -> ifr_name);

  ------>>>>    printf ("scheda_lan : %s\n",ifReq.ifr_name);

  if (ioctl (LocalSock, SIOCGIFFLAGS, &ifReq) < 0)
  {
   DEBUGSTATEMENT(printf("Can't get flags\r\n"));
   //exit(1);
  }
  /* Skip loopback, point-to-point and down interfaces, */
  /* except don't skip down interfaces */
  /* if we're trying to get a list of configurable interfaces.
  if ((ifReq.ifr_flags & IFF_LOOPBACK) || (!(ifReq.ifr_flags & IFF_UP)))
  {
   continue;
  }
  if (pifReq -> ifr_addr.sa_family == AF_INET)
  {
   /* Get a pointer to the address...
   memcpy (&LocalAddr, &pifReq -> ifr_addr, sizeof pifReq -> ifr_addr);
   if (LocalAddr.sin_addr.s_addr != htonl (INADDR_LOOPBACK))
   {
    tempresults[ctr] = LocalAddr.sin_addr.s_addr;
    ++ctr;
   }
  }
 }

 close(LocalSock);
 *pp_int = (int*)malloc(sizeof(int)*(ctr));
 memcpy(*pp_int,tempresults,sizeof(int)*ctr);

 return(ctr);
#endif
}


Thanks Michele


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Re: [ECOS] network interfaces

[Gary Thomas]

On Thu, 2005-11-24 at 11:26 +0100, Bass8tt8 wrote:
> Hi,
> 
> i have a function ( on Linux work well ) that get the list and the numbers
> of network interfaces excluding the LOOPBACK INTERFACE, but on ecos this
> dosn't work  :
> for debugging i print the name of interface finded : printf ("scheda_lan :
> %s\n",ifReq.ifr_name);
> but "eth0" there isn't ...  and this function return me always 0 !

Walking through the results of SIOCGIFCONF is a bit tricky.

Try looking at some eCos code that uses this API, e.g.
  .../packages/net/common/current/src/ifaddrs.c

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


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Re: [ECOS] network interfaces

[Andrew Lunn]

On Thu, Nov 24, 2005 at 11:26:25AM +0100, Bass8tt8 wrote:
> Hi,
> 
> i have a function ( on Linux work well ) that get the list and the numbers
> of network interfaces excluding the LOOPBACK INTERFACE, but on ecos this
> dosn't work  :

The network stack in eCos is from FreeBSD. So working on Linux does
not tell you that much....

As Gary suggested, try looking at some code which is known to work...

        Andrew

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