mirror of
https://github.com/sheumann/hush.git
synced 2024-08-17 00:29:03 +00:00
Hi, the following output is from BusyBox 1.0.0-pre10: ~ # ip link help ip: Command "help" is unknown, try "ip link help". tk This patch fixes it by removing the advertisements for the "ip blah help" stuff that is not implemented.
368 lines
6.9 KiB
C
368 lines
6.9 KiB
C
/*
|
|
* iplink.c "ip link".
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
*
|
|
*/
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <linux/version.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_packet.h>
|
|
#include <netpacket/packet.h>
|
|
|
|
#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
|
|
#include <net/ethernet.h>
|
|
#else
|
|
#include <linux/if_ether.h>
|
|
#endif
|
|
|
|
#include "rt_names.h"
|
|
#include "utils.h"
|
|
#include "ip_common.h"
|
|
|
|
#include "libbb.h"
|
|
|
|
|
|
/* take from linux/sockios.h */
|
|
#define SIOCSIFNAME 0x8923 /* set interface name */
|
|
|
|
static int do_link;
|
|
|
|
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;
|
|
|
|
strcpy(ifr.ifr_name, dev);
|
|
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)
|
|
{
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 0)
|
|
struct ifreq ifr;
|
|
int fd;
|
|
int err;
|
|
|
|
strcpy(ifr.ifr_name, dev);
|
|
strcpy(ifr.ifr_newname, newdev);
|
|
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;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
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));
|
|
strcpy(ifr.ifr_name, dev);
|
|
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));
|
|
strcpy(ifr.ifr_name, dev);
|
|
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;
|
|
int alen;
|
|
int s;
|
|
|
|
s = socket(PF_PACKET, SOCK_DGRAM, 0);
|
|
if (s < 0) {
|
|
perror("socket(PF_PACKET)");
|
|
return -1;
|
|
}
|
|
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strcpy(ifr.ifr_name, dev);
|
|
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));
|
|
strcpy(ifr->ifr_name, dev);
|
|
ifr->ifr_hwaddr.sa_family = hatype;
|
|
alen = ll_addr_a2n(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("Invalid \"mtu\" value\n", *argv);
|
|
} 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, "dev") == 0) {
|
|
NEXT_ARG();
|
|
}
|
|
if (dev)
|
|
duparg2("dev", *argv);
|
|
dev = *argv;
|
|
}
|
|
argc--; argv++;
|
|
}
|
|
|
|
if (!dev) {
|
|
bb_error_msg("Not enough of information: \"dev\" argument is required.");
|
|
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;
|
|
do_link = 1;
|
|
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);
|
|
}
|