mirror of https://github.com/F-Stack/f-stack.git
55 lines
975 B
C
55 lines
975 B
C
#include <sys/cdefs.h>
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#ifndef FSTACK
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#endif
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <ifaddrs.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#ifndef FSTACK
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#include "un-namespace.h"
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#endif
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char *
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if_indextoname(unsigned int ifindex, char *ifname)
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{
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struct ifaddrs *ifaddrs, *ifa;
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int error = 0;
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if (ifindex == 0) {
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errno = ENXIO;
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return(NULL);
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}
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if (getifaddrs(&ifaddrs) < 0)
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return(NULL); /* getifaddrs properly set errno */
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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if (ifa->ifa_addr &&
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ifa->ifa_addr->sa_family == AF_LINK &&
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ifindex == LLINDEX((struct sockaddr_dl*)ifa->ifa_addr))
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break;
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}
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if (ifa == NULL) {
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error = ENXIO;
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ifname = NULL;
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}
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else
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strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
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freeifaddrs(ifaddrs);
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errno = error;
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return(ifname);
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}
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