mirror of
https://github.com/sheumann/hush.git
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303 lines
6.4 KiB
C
303 lines
6.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* iplink.c "ip link".
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <net/if.h>
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#include <net/if_packet.h>
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#include "ip_common.h" /* #include "libbb.h" is inside */
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#include "rt_names.h"
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#include "utils.h"
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/* taken from linux/sockios.h */
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#define SIOCSIFNAME 0x8923 /* set interface name */
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/* Exits on error */
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static int get_ctl_fd(void)
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{
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int fd;
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fd = socket(PF_INET, SOCK_DGRAM, 0);
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if (fd >= 0)
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return fd;
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fd = socket(PF_PACKET, SOCK_DGRAM, 0);
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if (fd >= 0)
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return fd;
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return xsocket(PF_INET6, SOCK_DGRAM, 0);
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}
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/* Exits on error */
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static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
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{
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struct ifreq ifr;
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int fd;
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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fd = get_ctl_fd();
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xioctl(fd, SIOCGIFFLAGS, &ifr);
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if ((ifr.ifr_flags ^ flags) & mask) {
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ifr.ifr_flags &= ~mask;
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ifr.ifr_flags |= mask & flags;
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xioctl(fd, SIOCSIFFLAGS, &ifr);
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}
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close(fd);
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}
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/* Exits on error */
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static void do_changename(char *dev, char *newdev)
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{
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struct ifreq ifr;
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int fd;
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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strncpy_IFNAMSIZ(ifr.ifr_newname, newdev);
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fd = get_ctl_fd();
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xioctl(fd, SIOCSIFNAME, &ifr);
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close(fd);
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}
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/* Exits on error */
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static void set_qlen(char *dev, int qlen)
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{
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struct ifreq ifr;
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int s;
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s = get_ctl_fd();
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memset(&ifr, 0, sizeof(ifr));
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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ifr.ifr_qlen = qlen;
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xioctl(s, SIOCSIFTXQLEN, &ifr);
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close(s);
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}
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/* Exits on error */
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static void set_mtu(char *dev, int mtu)
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{
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struct ifreq ifr;
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int s;
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s = get_ctl_fd();
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memset(&ifr, 0, sizeof(ifr));
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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ifr.ifr_mtu = mtu;
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xioctl(s, SIOCSIFMTU, &ifr);
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close(s);
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}
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/* Exits on error */
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static int get_address(char *dev, int *htype)
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{
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struct ifreq ifr;
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struct sockaddr_ll me;
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socklen_t alen;
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int s;
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s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
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memset(&ifr, 0, sizeof(ifr));
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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xioctl(s, SIOCGIFINDEX, &ifr);
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memset(&me, 0, sizeof(me));
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me.sll_family = AF_PACKET;
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me.sll_ifindex = ifr.ifr_ifindex;
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me.sll_protocol = htons(ETH_P_LOOP);
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xbind(s, (struct sockaddr*)&me, sizeof(me));
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alen = sizeof(me);
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getsockname(s, (struct sockaddr*)&me, &alen);
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//never happens:
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//if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
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// bb_perror_msg_and_die("getsockname");
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close(s);
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*htype = me.sll_hatype;
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return me.sll_halen;
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}
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/* Exits on error */
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static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
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{
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int alen;
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memset(ifr, 0, sizeof(*ifr));
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strncpy_IFNAMSIZ(ifr->ifr_name, dev);
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ifr->ifr_hwaddr.sa_family = hatype;
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alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
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alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla);
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if (alen < 0)
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exit(EXIT_FAILURE);
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if (alen != halen) {
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bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
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}
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}
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/* Exits on error */
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static void set_address(struct ifreq *ifr, int brd)
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{
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int s;
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s = get_ctl_fd();
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if (brd)
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xioctl(s, SIOCSIFHWBROADCAST, ifr);
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else
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xioctl(s, SIOCSIFHWADDR, ifr);
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close(s);
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}
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static void die_must_be_on_off(const char *msg) NORETURN;
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static void die_must_be_on_off(const char *msg)
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{
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bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg);
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}
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/* Return value becomes exitcode. It's okay to not return at all */
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static int do_set(char **argv)
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{
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char *dev = NULL;
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uint32_t mask = 0;
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uint32_t flags = 0;
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int qlen = -1;
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int mtu = -1;
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char *newaddr = NULL;
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char *newbrd = NULL;
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struct ifreq ifr0, ifr1;
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char *newname = NULL;
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int htype, halen;
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static const char keywords[] ALIGN1 =
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"up\0""down\0""name\0""mtu\0""multicast\0"
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"arp\0""address\0""dev\0";
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enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_multicast,
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ARG_arp, ARG_addr, ARG_dev };
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static const char str_on_off[] ALIGN1 = "on\0""off\0";
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enum { PARM_on = 0, PARM_off };
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smalluint key;
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while (*argv) {
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/* substring search ensures that e.g. "addr" and "address"
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* are both accepted */
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key = index_in_substrings(keywords, *argv);
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if (key == ARG_up) {
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mask |= IFF_UP;
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flags |= IFF_UP;
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}
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if (key == ARG_down) {
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mask |= IFF_UP;
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flags &= ~IFF_UP;
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}
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if (key == ARG_name) {
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NEXT_ARG();
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newname = *argv;
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}
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if (key == ARG_mtu) {
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NEXT_ARG();
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if (mtu != -1)
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duparg("mtu", *argv);
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mtu = get_unsigned(*argv, "mtu");
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}
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if (key == ARG_multicast) {
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int param;
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NEXT_ARG();
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mask |= IFF_MULTICAST;
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param = index_in_strings(str_on_off, *argv);
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if (param < 0)
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die_must_be_on_off("multicast");
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if (param == PARM_on)
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flags |= IFF_MULTICAST;
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else
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flags &= ~IFF_MULTICAST;
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}
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if (key == ARG_arp) {
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int param;
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NEXT_ARG();
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mask |= IFF_NOARP;
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param = index_in_strings(str_on_off, *argv);
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if (param < 0)
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die_must_be_on_off("arp");
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if (param == PARM_on)
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flags &= ~IFF_NOARP;
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else
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flags |= IFF_NOARP;
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}
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if (key == ARG_addr) {
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NEXT_ARG();
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newaddr = *argv;
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}
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if (key >= ARG_dev) {
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if (key == ARG_dev) {
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NEXT_ARG();
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}
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if (dev)
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duparg2("dev", *argv);
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dev = *argv;
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}
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argv++;
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}
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if (!dev) {
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bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
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}
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if (newaddr || newbrd) {
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halen = get_address(dev, &htype);
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if (newaddr) {
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parse_address(dev, htype, halen, newaddr, &ifr0);
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}
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if (newbrd) {
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parse_address(dev, htype, halen, newbrd, &ifr1);
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}
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}
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if (newname && strcmp(dev, newname)) {
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do_changename(dev, newname);
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dev = newname;
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}
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if (qlen != -1) {
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set_qlen(dev, qlen);
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}
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if (mtu != -1) {
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set_mtu(dev, mtu);
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}
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if (newaddr || newbrd) {
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if (newbrd) {
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set_address(&ifr1, 1);
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}
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if (newaddr) {
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set_address(&ifr0, 0);
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}
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}
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if (mask)
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do_chflags(dev, flags, mask);
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return 0;
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}
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static int ipaddr_list_link(char **argv)
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{
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preferred_family = AF_PACKET;
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return ipaddr_list_or_flush(argv, 0);
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}
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/* Return value becomes exitcode. It's okay to not return at all */
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int do_iplink(char **argv)
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{
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static const char keywords[] ALIGN1 =
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"set\0""show\0""lst\0""list\0";
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int key;
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if (!*argv)
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return ipaddr_list_link(argv);
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key = index_in_substrings(keywords, *argv);
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if (key < 0)
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bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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argv++;
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if (key == 0) /* set */
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return do_set(argv);
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/* show, lst, list */
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return ipaddr_list_link(argv);
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}
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