124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* Licensed under the GNU General Public License version 2 with exceptions. See
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* LICENSE file in the project root for full license information
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*/
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "oshw.h"
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/**
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* Host to Network byte order (i.e. to big endian).
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*
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* Note that Ethercat uses little endian byte order, except for the Ethernet
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* header which is big endian as usual.
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*/
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uint16 oshw_htons(uint16 host)
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{
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uint16 network = htons (host);
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return network;
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}
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/**
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* Network (i.e. big endian) to Host byte order.
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*
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* Note that Ethercat uses little endian byte order, except for the Ethernet
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* header which is big endian as usual.
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*/
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uint16 oshw_ntohs(uint16 network)
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{
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uint16 host = ntohs (network);
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return host;
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}
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/** Create list over available network adapters.
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* @return First element in linked list of adapters
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*/
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ec_adaptert * oshw_find_adapters(void)
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{
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int i;
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int string_len;
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struct if_nameindex *ids;
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ec_adaptert * adapter;
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ec_adaptert * prev_adapter;
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ec_adaptert * ret_adapter = NULL;
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/* Iterate all devices and create a local copy holding the name and
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* decsription.
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*/
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ids = if_nameindex ();
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for(i = 0; ids[i].if_index != 0; i++)
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{
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adapter = (ec_adaptert *)malloc(sizeof(ec_adaptert));
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/* If we got more than one adapter save link list pointer to previous
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* adapter.
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* Else save as pointer to return.
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*/
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if (i)
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{
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prev_adapter->next = adapter;
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}
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else
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{
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ret_adapter = adapter;
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}
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/* fetch description and name, in linux we use the same on both */
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adapter->next = NULL;
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if (ids[i].if_name)
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{
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string_len = strlen(ids[i].if_name);
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if (string_len > (EC_MAXLEN_ADAPTERNAME - 1))
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{
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string_len = EC_MAXLEN_ADAPTERNAME - 1;
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}
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strncpy(adapter->name, ids[i].if_name,string_len);
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adapter->name[string_len] = '\0';
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strncpy(adapter->desc, ids[i].if_name,string_len);
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adapter->desc[string_len] = '\0';
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}
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else
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{
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adapter->name[0] = '\0';
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adapter->desc[0] = '\0';
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}
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prev_adapter = adapter;
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}
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if_freenameindex (ids);
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return ret_adapter;
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}
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/** Free memory allocated memory used by adapter collection.
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* @param[in] adapter = First element in linked list of adapters
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* EC_NOFRAME.
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*/
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void oshw_free_adapters(ec_adaptert * adapter)
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{
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ec_adaptert * next_adapter;
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/* Iterate the linked list and free all elemnts holding
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* adapter information
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*/
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if(adapter)
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{
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next_adapter = adapter->next;
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free (adapter);
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while (next_adapter)
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{
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adapter = next_adapter;
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next_adapter = adapter->next;
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free (adapter);
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}
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}
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}
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