#include "global.h"
#include "get1steth.h"
char szIface[MAX_STR];
int Verbose;
extern char compiled[], compiledby[], compilehost[];
static void Usage()
{
printf("-= GET_FIRST_ETHERNET =- Get First Ethernet Interface tool\n"
"=== %s === %s@%s ===\n\n"
"Syntax: get1steth [option] [custom_first_interface]\n\n"
"\t-v\t\tVerbose (more -v more verbosity)\n"
"\t-g\t\tOnly get first interface, print and exit ...\n"
"\n", compiled, compiledby, compilehost);
}
// -------------------------------
int main(int argc, char **argv)
{
char ch, GetOnly = 0;
struct ifaddrs *ifa, *ifp;
struct sockaddr_dl *sdl;
struct ifreq ifr;
int s;
while ((ch = getopt(argc, argv, "hvg")) != -1)
switch (ch) {
case 'g':
GetOnly = 1;
break;
case 'v':
Verbose++;
break;
case 'h':
default:
Usage();
return 1;
}
argc -= optind;
argv += optind;
openlog("get1steth", LOG_CONS, LOG_CONSOLE);
if (argc) {
strlcpy(szIface, *argv, MAX_STR);
VERB(1) syslog(LOG_NOTICE, "Info:: Get CUSTOM first interface %s\n", szIface);
} else {
getifaddrs(&ifa);
for (ifp = ifa; ifp; ifp = ifp->ifa_next) {
if (PF_LINK == ifp->ifa_addr->sa_family &&
IFT_ETHER == ((struct sockaddr_dl*) ifp->ifa_addr)->sdl_type) {
strlcpy(szIface, ifp->ifa_name, MAX_STR);
sdl = (struct sockaddr_dl*) ifp->ifa_addr;
VERB(2) syslog(LOG_NOTICE, "Info:: Get first interface=%s MAC=%s\n", szIface,
ether_ntoa((struct ether_addr*) LLADDR(sdl)));
break;
}
}
freeifaddrs(ifa);
}
if (GetOnly) {
printf("%s\n", szIface);
closelog();
return 0;
}
memset(&ifr, 0, sizeof ifr);
strlcpy(ifr.ifr_name, szIface, sizeof ifr.ifr_name);
s = socket(PF_LOCAL, SOCK_DGRAM, 0);
if (-1 == s) {
syslog(LOG_ERR, "Error:: socket(LOCAL) #%d - %s\n", errno, strerror(errno));
return 2;
}
if (ioctl(s, SIOCIFCREATE2, &ifr) == -1) {
syslog(LOG_ERR, "Error:: ioctl(SIOCIFCREATE2) #%d - %s\n", errno, strerror(errno));
close(s);
return 2;
}
close(s);
closelog();
return 0;
}
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