101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
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/*
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* code extrait des bas-fonds de l'internet obscur !
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*
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* DON'T TRUST IT !
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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/* ------------------------------------------------------------- */
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int get_if_flags(char *ifname, short *p_flags)
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{
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int fd;
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int retcode;
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struct ifreq req;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s \"%s\" to %p\n", __func__, ifname, p_flags);
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#endif
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/* Sanity check */
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if ( strlen(ifname) > (IFNAMSIZ-1) )
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{
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fprintf(stderr, "name %s to long\n", ifname);
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abort();
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}
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fd = socket(PF_INET, SOCK_DGRAM, 0);
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if (fd < 0)
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{
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perror("socket bla...");
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return -2;
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}
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#if DEBUG_LEVEL
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fprintf(stderr, "fd socket bla... = %d\n", fd);
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#endif
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/* populate the struct for the request */
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memset(&req, 0, sizeof(req));
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strcpy(req.ifr_name, ifname);
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/* do the call */
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retcode = ioctl(fd, SIOCGIFFLAGS, &req);
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if (retcode < 0)
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{
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perror("ioctl SIOCGIFFLAGS");
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close(fd);
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return -1;
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}
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#if DEBUG_LEVEL
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fprintf(stderr, "ioctl -> %d\n", retcode);
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#endif
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#if DEBUG_LEVEL
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/* display the result */
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fprintf(stderr, "flags = 0x%04x\n", req.ifr_flags);
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#endif
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close(fd);
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*p_flags = req.ifr_flags;
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return 0;
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}
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/* ------------------------------------------------------------- */
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int get_if_up_or_down(char *ifname)
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{
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int foo;
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short flags;
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foo = get_if_flags(ifname, &flags);
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#if DEBUG_LEVEL
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fprintf(stderr, "get flags -> %d\n", foo);
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#endif
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if (foo < 0) /* got an error ? */
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return -1;
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return (flags & IFF_UP) ? 1 : 0;
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}
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/* ------------------------------------------------------------- */
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int get_if_running(char *ifname)
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{
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int foo;
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short flags;
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foo = get_if_flags(ifname, &flags);
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#if DEBUG_LEVEL
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fprintf(stderr, "get flags -> %d\n", foo);
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#endif
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if (foo < 0) /* got an error ? */
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return -1;
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return (flags & IFF_RUNNING) ? 1 : 0;
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}
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/* ------------------------------------------------------------- */
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