/* vi: set sw=4 ts=4: */
/*
- * iplink.c "ip link".
+ * iplink.c "ip link".
*
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ * 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 <sys/ioctl.h>
+//#include <sys/socket.h>
#include <net/if.h>
#include <net/if_packet.h>
#include <netpacket/packet.h>
-
#include <net/ethernet.h>
+#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
-#include "ip_common.h"
-/* take from linux/sockios.h */
+/* taken 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;
-}
-
+/* Exits on error */
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;
+ return xsocket(PF_INET6, SOCK_DGRAM, 0);
}
-static int do_chflags(char *dev, __u32 flags, __u32 mask)
+/* Exits on error */
+static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
{
struct ifreq ifr;
int fd;
- int err;
- strcpy(ifr.ifr_name, dev);
+ strncpy_IFNAMSIZ(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) {
+ xioctl(fd, SIOCGIFFLAGS, &ifr);
+ if ((ifr.ifr_flags ^ flags) & mask) {
ifr.ifr_flags &= ~mask;
- ifr.ifr_flags |= mask&flags;
- err = ioctl(fd, SIOCSIFFLAGS, &ifr);
- if (err)
- perror("SIOCSIFFLAGS");
+ ifr.ifr_flags |= mask & flags;
+ xioctl(fd, SIOCSIFFLAGS, &ifr);
}
close(fd);
- return err;
}
-static int do_changename(char *dev, char *newdev)
+/* Exits on error */
+static void do_changename(char *dev, char *newdev)
{
struct ifreq ifr;
int fd;
- int err;
- strcpy(ifr.ifr_name, dev);
- strcpy(ifr.ifr_newname, newdev);
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
+ strncpy_IFNAMSIZ(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;
- }
+ xioctl(fd, SIOCSIFNAME, &ifr);
close(fd);
- return err;
}
-static int set_qlen(char *dev, int qlen)
+/* Exits on error */
+static void 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);
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
ifr.ifr_qlen = qlen;
- if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
- perror("SIOCSIFXQLEN");
- close(s);
- return -1;
- }
+ xioctl(s, SIOCSIFTXQLEN, &ifr);
close(s);
-
- return 0;
}
-static int set_mtu(char *dev, int mtu)
+/* Exits on error */
+static void 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);
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
ifr.ifr_mtu = mtu;
- if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
- perror("SIOCSIFMTU");
- close(s);
- return -1;
- }
+ xioctl(s, SIOCSIFMTU, &ifr);
close(s);
-
- return 0;
}
+/* Exits on error */
static int get_address(char *dev, int *htype)
{
struct ifreq ifr;
socklen_t alen;
int s;
- s = socket(PF_PACKET, SOCK_DGRAM, 0);
- if (s < 0) {
- perror("socket(PF_PACKET)");
- return -1;
- }
+ s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
memset(&ifr, 0, sizeof(ifr));
- strcpy(ifr.ifr_name, dev);
- if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
- perror("SIOCGIFINDEX");
- close(s);
- return -1;
- }
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
+ xioctl(s, SIOCGIFINDEX, &ifr);
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;
- }
-
+ xbind(s, (struct sockaddr*)&me, sizeof(me));
alen = sizeof(me);
- if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
- perror("getsockname");
- close(s);
- return -1;
- }
+ getsockname(s, (struct sockaddr*)&me, &alen);
+ //never happens:
+ //if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
+ // bb_perror_msg_and_die("getsockname");
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)
+/* Exits on error */
+static void 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);
+ strncpy_IFNAMSIZ(ifr->ifr_name, dev);
ifr->ifr_hwaddr.sa_family = hatype;
- alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
+
+ alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
+ alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla);
if (alen < 0)
- return -1;
+ exit(EXIT_FAILURE);
if (alen != halen) {
- bb_error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
- return -1;
+ bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
}
- return 0;
}
-static int set_address(struct ifreq *ifr, int brd)
+/* Exits on error */
+static void 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;
- }
+ if (brd)
+ xioctl(s, SIOCSIFHWBROADCAST, ifr);
+ else
+ xioctl(s, SIOCSIFHWADDR, ifr);
close(s);
- return 0;
}
-static int do_set(int argc, char **argv)
+static void die_must_be_on_off(const char *msg) NORETURN;
+static void die_must_be_on_off(const char *msg)
+{
+ bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg);
+}
+
+/* Return value becomes exitcode. It's okay to not return at all */
+static int do_set(char **argv)
{
char *dev = NULL;
- __u32 mask = 0;
- __u32 flags = 0;
+ uint32_t mask = 0;
+ uint32_t flags = 0;
int qlen = -1;
int mtu = -1;
char *newaddr = NULL;
struct ifreq ifr0, ifr1;
char *newname = NULL;
int htype, halen;
-
- while (argc > 0) {
- if (strcmp(*argv, "up") == 0) {
+ static const char keywords[] ALIGN1 =
+ "up\0""down\0""name\0""mtu\0""multicast\0"
+ "arp\0""address\0""dev\0";
+ enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_multicast,
+ ARG_arp, ARG_addr, ARG_dev };
+ static const char str_on_off[] ALIGN1 = "on\0""off\0";
+ enum { PARM_on = 0, PARM_off };
+ smalluint key;
+
+ while (*argv) {
+ /* substring search ensures that e.g. "addr" and "address"
+ * are both accepted */
+ key = index_in_substrings(keywords, *argv);
+ if (key == ARG_up) {
mask |= IFF_UP;
flags |= IFF_UP;
- } else if (strcmp(*argv, "down") == 0) {
+ }
+ if (key == ARG_down) {
mask |= IFF_UP;
flags &= ~IFF_UP;
- } else if (strcmp(*argv, "name") == 0) {
+ }
+ if (key == ARG_name) {
NEXT_ARG();
newname = *argv;
- } else if (strcmp(*argv, "mtu") == 0) {
+ }
+ if (key == ARG_mtu) {
NEXT_ARG();
if (mtu != -1)
duparg("mtu", *argv);
- if (get_integer(&mtu, *argv, 0))
- invarg(*argv, "mtu");
- } else if (strcmp(*argv, "multicast") == 0) {
+ mtu = get_unsigned(*argv, "mtu");
+ }
+ if (key == ARG_multicast) {
+ int param;
NEXT_ARG();
mask |= IFF_MULTICAST;
- if (strcmp(*argv, "on") == 0) {
+ param = index_in_strings(str_on_off, *argv);
+ if (param < 0)
+ die_must_be_on_off("multicast");
+ if (param == PARM_on)
flags |= IFF_MULTICAST;
- } else if (strcmp(*argv, "off") == 0) {
+ else
flags &= ~IFF_MULTICAST;
- } else
- return on_off("multicast");
- } else if (strcmp(*argv, "arp") == 0) {
+ }
+ if (key == ARG_arp) {
+ int param;
NEXT_ARG();
mask |= IFF_NOARP;
- if (strcmp(*argv, "on") == 0) {
+ param = index_in_strings(str_on_off, *argv);
+ if (param < 0)
+ die_must_be_on_off("arp");
+ if (param == PARM_on)
flags &= ~IFF_NOARP;
- } else if (strcmp(*argv, "off") == 0) {
+ else
flags |= IFF_NOARP;
- } else
- return on_off("noarp");
- } else if (strcmp(*argv, "addr") == 0) {
+ }
+ if (key == ARG_addr) {
NEXT_ARG();
newaddr = *argv;
- } else {
- if (strcmp(*argv, "dev") == 0) {
+ }
+ if (key >= ARG_dev) {
+ if (key == ARG_dev) {
NEXT_ARG();
}
if (dev)
duparg2("dev", *argv);
dev = *argv;
}
- argc--; argv++;
+ argv++;
}
if (!dev) {
- bb_error_msg(bb_msg_requires_arg, "\"dev\"");
- exit(-1);
+ bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
}
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;
+ parse_address(dev, htype, halen, newaddr, &ifr0);
}
if (newbrd) {
- if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
- return -1;
+ parse_address(dev, htype, halen, newbrd, &ifr1);
}
}
if (newname && strcmp(dev, newname)) {
- if (do_changename(dev, newname) < 0)
- return -1;
+ do_changename(dev, newname);
dev = newname;
}
if (qlen != -1) {
- if (set_qlen(dev, qlen) < 0)
- return -1;
+ set_qlen(dev, qlen);
}
if (mtu != -1) {
- if (set_mtu(dev, mtu) < 0)
- return -1;
+ set_mtu(dev, mtu);
}
if (newaddr || newbrd) {
if (newbrd) {
- if (set_address(&ifr1, 1) < 0)
- return -1;
+ set_address(&ifr1, 1);
}
if (newaddr) {
- if (set_address(&ifr0, 0) < 0)
- return -1;
+ set_address(&ifr0, 0);
}
}
if (mask)
- return do_chflags(dev, flags, mask);
+ do_chflags(dev, flags, mask);
return 0;
}
-static int ipaddr_list_link(int argc, char **argv)
+static int ipaddr_list_link(char **argv)
{
preferred_family = AF_PACKET;
- do_link = 1;
- return ipaddr_list_or_flush(argc, argv, 0);
+ return ipaddr_list_or_flush(argv, 0);
}
-int do_iplink(int argc, char **argv)
+/* Return value becomes exitcode. It's okay to not return at all */
+int do_iplink(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);
+ static const char keywords[] ALIGN1 =
+ "set\0""show\0""lst\0""list\0";
+ int key;
+ if (!*argv)
+ return ipaddr_list_link(argv);
+ key = index_in_substrings(keywords, *argv);
+ if (key < 0)
+ bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
+ argv++;
+ if (key == 0) /* set */
+ return do_set(argv);
+ /* show, lst, list */
+ return ipaddr_list_link(argv);
}
projects / oweals / busybox.git / blobdiff