133 lines
3.2 KiB
C
133 lines
3.2 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 "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 = 0;
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int ret = 0;
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pcap_if_t *alldevs;
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pcap_if_t *d;
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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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char errbuf[PCAP_ERRBUF_SIZE];
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size_t string_len;
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/* find all devices */
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if (pcap_findalldevs(&alldevs, errbuf) == -1)
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{
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fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
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return (NULL);
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}
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/* Iterate all devices and create a local copy holding the name and
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* description.
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*/
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for(d= alldevs; d != NULL; d= d->next)
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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 of the device from libpcap */
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adapter->next = NULL;
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if (d->name)
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{
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string_len = strlen(d->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, d->name,string_len);
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adapter->name[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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}
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if (d->description)
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{
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string_len = strlen(d->description);
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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->desc, d->description,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->desc[0] = '\0';
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}
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prev_adapter = adapter;
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i++;
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}
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/* free all devices allocated */
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pcap_freealldevs(alldevs);
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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 elements 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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