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/* See LICENSE file for copyright and license details. */
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-a] [<interface>] [up|down]\n", argv0);
}
#ifndef IFF_LOWER_UP
#define IFF_LOWER_UP 1<<16
#endif
#ifndef IFF_DORMANT
#define IFF_DORMANT 1<<17
#endif
#ifndef IFF_ECHO
#define IFF_ECHO 1<<18
#endif
static void
print_interface(char *name)
{
int fd;
struct ifreq ifr;
int first;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
weprintf("error in socket(AF_INTER, SOCK_DGRAM, 0) on interface '%s': %s\n", name, strerror(errno));
return;
}
strncpy(ifr.ifr_name, name, IF_NAMESIZE);
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
close(fd);
weprintf("error in ioctl(SIOCGIFFLAGS) on interface '%s': %s\n", name, strerror(errno));
return;
}
printf("%s: flags=%d<", name, ifr.ifr_flags);
if (ifr.ifr_flags == 0) {
printf(">");
} else {
first = 1;
if (ifr.ifr_flags & IFF_UP) {
printf("%sUP", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_BROADCAST) {
printf("%sBROADCAST", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_DEBUG) {
printf("%sDEBUG", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_LOOPBACK) {
printf("%sLOOPBACK", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_POINTOPOINT) {
printf("%sPOINTOPOINT", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_RUNNING) {
printf("%sRUNNING", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_NOARP) {
printf("%sNOARP", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_PROMISC) {
printf("%sPROMISC", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_NOTRAILERS) {
printf("%sNOTRAILERS", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_ALLMULTI) {
printf("%sALLMULTI", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_MASTER) {
printf("%sMASTER", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_SLAVE) {
printf("%sSLAVE", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_MULTICAST) {
printf("%sMULTICAST", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_PORTSEL) {
printf("%sPORTSEL", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_AUTOMEDIA) {
printf("%sAUTOMEDIA", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_DYNAMIC) {
printf("%sDYNAMIC", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_LOWER_UP) {
printf("%sLOWER_UP", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_DORMANT) {
printf("%sDORMANT", !first ? "," : ""); first = 0;
}
if (ifr.ifr_flags & IFF_ECHO) {
printf("%sECHO", !first ? "," : ""); first = 0;
}
printf(">");
}
if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
close(fd);
weprintf("error in ioctl(SIOCGIFMTU) on interface '%s': %s\n", name, strerror(errno));
return;
}
printf(" mtu %d\n", ifr.ifr_mtu);
char ip_addr[INET_ADDRSTRLEN];
if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
struct sockaddr_in* addr = (struct sockaddr_in*)&ifr.ifr_addr;
inet_ntop(AF_INET, &addr->sin_addr, ip_addr, INET_ADDRSTRLEN);
} else {
ip_addr[0] = '\0';
}
char ip_netmask[INET_ADDRSTRLEN];
if (ioctl(fd, SIOCGIFNETMASK, &ifr) == 0) {
struct sockaddr_in* netmask = (struct sockaddr_in*)&ifr.ifr_netmask;
inet_ntop(AF_INET, &netmask->sin_addr, ip_netmask, INET_ADDRSTRLEN);
} else {
ip_netmask[0] = '\0';
}
char ip_broadcast[INET_ADDRSTRLEN];
if (ioctl(fd, SIOCGIFBRDADDR, &ifr) == 0) {
struct sockaddr_in* broadcast = (struct sockaddr_in*)&ifr.ifr_broadaddr;
inet_ntop(AF_INET, &broadcast->sin_addr, ip_broadcast, INET_ADDRSTRLEN);
} else {
ip_broadcast[0] = '\0';
}
char ip_hwaddr[32];
if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
memcpy(ip_hwaddr, ifr.ifr_hwaddr.sa_data, 8);
} else {
memset(ip_hwaddr, 0, 32);
}
printf(" inet %s netmask %s broadcast %s\n",
ip_addr, ip_netmask, ip_broadcast);
printf(" ether ");
first = 1;
for (int i = 0; i <6; i++) {
printf("%s%02x", ( !first ) ? ":" : "", ip_hwaddr[i] & 0xFF); first = 0;
}
puts("");
close(fd);
}
static void
set_up_down(char *name, int up)
{
int fd;
struct ifreq ifr;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
weprintf("error in socket(AF_INTER, SOCK_DGRAM, 0) on interface '%s': %s\n", name, strerror(errno));
return;
}
strncpy(ifr.ifr_name, name, IF_NAMESIZE);
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
close(fd);
weprintf("error in ioctl(SIOCGIFFLAGS) on interface '%s': %s\n", name, strerror(errno));
return;
}
if (up) {
ifr.ifr_flags |= IFF_UP;
} else {
ifr.ifr_flags &= ~IFF_UP;
}
if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
close(fd);
weprintf("error in ioctl(SIOCGIFFLAGS) on interface '%s': %s\n", name, strerror(errno));
return;
}
}
int
main(int argc, char *argv[])
{
int show_all = 0;
ARGBEGIN {
case 'a':
show_all = 1;
break;
default:
usage();
} ARGEND
if (show_all) {
struct if_nameindex *interfaces, *interface;
interfaces = if_nameindex();
if (interfaces != NULL) {
for (interface = interfaces; (interface->if_index != 0 || interface->if_name != NULL); interface++) {
print_interface(interface->if_name);
}
if_freenameindex(interfaces);
}
} else {
if (argc == 1) {
print_interface(argv[0]);
} else if (argc == 2) {
int up;
if (strcmp(argv[1], "up") == 0) {
up = 1;
} else if (strcmp(argv[1], "down") == 0) {
up = 0;
} else {
weprintf("Expecting 'up' or 'down'\n");
usage();
}
set_up_down(argv[0], up);
} else {
usage();
}
}
return 0;
}
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