mirror of
https://github.com/sheumann/hush.git
synced 2024-12-30 20:29:21 +00:00
355 lines
6.7 KiB
C
355 lines
6.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* iplink.c "ip link".
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_packet.h>
|
|
#include <netpacket/packet.h>
|
|
|
|
#include <net/ethernet.h>
|
|
|
|
#include "rt_names.h"
|
|
#include "utils.h"
|
|
#include "ip_common.h"
|
|
|
|
/* take from linux/sockios.h */
|
|
#define SIOCSIFNAME 0x8923 /* set interface name */
|
|
|
|
static int on_off(char *msg)
|
|
{
|
|
bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
|
|
return -1;
|
|
}
|
|
|
|
static int get_ctl_fd(void)
|
|
{
|
|
int s_errno;
|
|
int fd;
|
|
|
|
fd = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (fd >= 0)
|
|
return fd;
|
|
s_errno = errno;
|
|
fd = socket(PF_PACKET, SOCK_DGRAM, 0);
|
|
if (fd >= 0)
|
|
return fd;
|
|
fd = socket(PF_INET6, SOCK_DGRAM, 0);
|
|
if (fd >= 0)
|
|
return fd;
|
|
errno = s_errno;
|
|
perror("Cannot create control socket");
|
|
return -1;
|
|
}
|
|
|
|
static int do_chflags(char *dev, __u32 flags, __u32 mask)
|
|
{
|
|
struct ifreq ifr;
|
|
int fd;
|
|
int err;
|
|
|
|
strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
|
|
fd = get_ctl_fd();
|
|
if (fd < 0)
|
|
return -1;
|
|
err = ioctl(fd, SIOCGIFFLAGS, &ifr);
|
|
if (err) {
|
|
perror("SIOCGIFFLAGS");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
if ((ifr.ifr_flags^flags)&mask) {
|
|
ifr.ifr_flags &= ~mask;
|
|
ifr.ifr_flags |= mask&flags;
|
|
err = ioctl(fd, SIOCSIFFLAGS, &ifr);
|
|
if (err)
|
|
perror("SIOCSIFFLAGS");
|
|
}
|
|
close(fd);
|
|
return err;
|
|
}
|
|
|
|
static int do_changename(char *dev, char *newdev)
|
|
{
|
|
struct ifreq ifr;
|
|
int fd;
|
|
int err;
|
|
|
|
strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
|
|
strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
|
|
fd = get_ctl_fd();
|
|
if (fd < 0)
|
|
return -1;
|
|
err = ioctl(fd, SIOCSIFNAME, &ifr);
|
|
if (err) {
|
|
perror("SIOCSIFNAME");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
close(fd);
|
|
return err;
|
|
}
|
|
|
|
static int set_qlen(char *dev, int qlen)
|
|
{
|
|
struct ifreq ifr;
|
|
int s;
|
|
|
|
s = get_ctl_fd();
|
|
if (s < 0)
|
|
return -1;
|
|
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
|
|
ifr.ifr_qlen = qlen;
|
|
if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
|
|
perror("SIOCSIFXQLEN");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
close(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_mtu(char *dev, int mtu)
|
|
{
|
|
struct ifreq ifr;
|
|
int s;
|
|
|
|
s = get_ctl_fd();
|
|
if (s < 0)
|
|
return -1;
|
|
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
|
|
ifr.ifr_mtu = mtu;
|
|
if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
|
|
perror("SIOCSIFMTU");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
close(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_address(char *dev, int *htype)
|
|
{
|
|
struct ifreq ifr;
|
|
struct sockaddr_ll me;
|
|
socklen_t alen;
|
|
int s;
|
|
|
|
s = socket(PF_PACKET, SOCK_DGRAM, 0);
|
|
if (s < 0) {
|
|
perror("socket(PF_PACKET)");
|
|
return -1;
|
|
}
|
|
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
|
|
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
|
|
perror("SIOCGIFINDEX");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
|
|
memset(&me, 0, sizeof(me));
|
|
me.sll_family = AF_PACKET;
|
|
me.sll_ifindex = ifr.ifr_ifindex;
|
|
me.sll_protocol = htons(ETH_P_LOOP);
|
|
if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
|
|
perror("bind");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
|
|
alen = sizeof(me);
|
|
if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
|
|
perror("getsockname");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
close(s);
|
|
*htype = me.sll_hatype;
|
|
return me.sll_halen;
|
|
}
|
|
|
|
static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
|
|
{
|
|
int alen;
|
|
|
|
memset(ifr, 0, sizeof(*ifr));
|
|
strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
|
|
ifr->ifr_hwaddr.sa_family = hatype;
|
|
alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
|
|
if (alen < 0)
|
|
return -1;
|
|
if (alen != halen) {
|
|
bb_error_msg("wrong address (%s) length: expected %d bytes", lla, halen);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int set_address(struct ifreq *ifr, int brd)
|
|
{
|
|
int s;
|
|
|
|
s = get_ctl_fd();
|
|
if (s < 0)
|
|
return -1;
|
|
if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
|
|
perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
|
|
close(s);
|
|
return -1;
|
|
}
|
|
close(s);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int do_set(int argc, char **argv)
|
|
{
|
|
char *dev = NULL;
|
|
__u32 mask = 0;
|
|
__u32 flags = 0;
|
|
int qlen = -1;
|
|
int mtu = -1;
|
|
char *newaddr = NULL;
|
|
char *newbrd = NULL;
|
|
struct ifreq ifr0, ifr1;
|
|
char *newname = NULL;
|
|
int htype, halen;
|
|
|
|
while (argc > 0) {
|
|
if (strcmp(*argv, "up") == 0) {
|
|
mask |= IFF_UP;
|
|
flags |= IFF_UP;
|
|
} else if (strcmp(*argv, "down") == 0) {
|
|
mask |= IFF_UP;
|
|
flags &= ~IFF_UP;
|
|
} else if (strcmp(*argv, "name") == 0) {
|
|
NEXT_ARG();
|
|
newname = *argv;
|
|
} else if (strcmp(*argv, "mtu") == 0) {
|
|
NEXT_ARG();
|
|
if (mtu != -1)
|
|
duparg("mtu", *argv);
|
|
if (get_integer(&mtu, *argv, 0))
|
|
invarg(*argv, "mtu");
|
|
} else if (strcmp(*argv, "multicast") == 0) {
|
|
NEXT_ARG();
|
|
mask |= IFF_MULTICAST;
|
|
if (strcmp(*argv, "on") == 0) {
|
|
flags |= IFF_MULTICAST;
|
|
} else if (strcmp(*argv, "off") == 0) {
|
|
flags &= ~IFF_MULTICAST;
|
|
} else
|
|
return on_off("multicast");
|
|
} else if (strcmp(*argv, "arp") == 0) {
|
|
NEXT_ARG();
|
|
mask |= IFF_NOARP;
|
|
if (strcmp(*argv, "on") == 0) {
|
|
flags &= ~IFF_NOARP;
|
|
} else if (strcmp(*argv, "off") == 0) {
|
|
flags |= IFF_NOARP;
|
|
} else
|
|
return on_off("noarp");
|
|
} else if (strcmp(*argv, "addr") == 0) {
|
|
NEXT_ARG();
|
|
newaddr = *argv;
|
|
} else {
|
|
if (strcmp(*argv, "dev") == 0) {
|
|
NEXT_ARG();
|
|
}
|
|
if (dev)
|
|
duparg2("dev", *argv);
|
|
dev = *argv;
|
|
}
|
|
argc--; argv++;
|
|
}
|
|
|
|
if (!dev) {
|
|
bb_error_msg(bb_msg_requires_arg, "\"dev\"");
|
|
exit(-1);
|
|
}
|
|
|
|
if (newaddr || newbrd) {
|
|
halen = get_address(dev, &htype);
|
|
if (halen < 0)
|
|
return -1;
|
|
if (newaddr) {
|
|
if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
|
|
return -1;
|
|
}
|
|
if (newbrd) {
|
|
if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (newname && strcmp(dev, newname)) {
|
|
if (do_changename(dev, newname) < 0)
|
|
return -1;
|
|
dev = newname;
|
|
}
|
|
if (qlen != -1) {
|
|
if (set_qlen(dev, qlen) < 0)
|
|
return -1;
|
|
}
|
|
if (mtu != -1) {
|
|
if (set_mtu(dev, mtu) < 0)
|
|
return -1;
|
|
}
|
|
if (newaddr || newbrd) {
|
|
if (newbrd) {
|
|
if (set_address(&ifr1, 1) < 0)
|
|
return -1;
|
|
}
|
|
if (newaddr) {
|
|
if (set_address(&ifr0, 0) < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
if (mask)
|
|
return do_chflags(dev, flags, mask);
|
|
return 0;
|
|
}
|
|
|
|
static int ipaddr_list_link(int argc, char **argv)
|
|
{
|
|
preferred_family = AF_PACKET;
|
|
return ipaddr_list_or_flush(argc, argv, 0);
|
|
}
|
|
|
|
int do_iplink(int argc, char **argv)
|
|
{
|
|
if (argc > 0) {
|
|
if (matches(*argv, "set") == 0)
|
|
return do_set(argc-1, argv+1);
|
|
if (matches(*argv, "show") == 0 ||
|
|
matches(*argv, "lst") == 0 ||
|
|
matches(*argv, "list") == 0)
|
|
return ipaddr_list_link(argc-1, argv+1);
|
|
} else
|
|
return ipaddr_list_link(0, NULL);
|
|
|
|
bb_error_msg("command \"%s\" is unknown", *argv);
|
|
exit(-1);
|
|
}
|