blob: cbd6d115f59072d5911201cceb1efcb6bc6d442f [file] [log] [blame] [edit]
/*
* ipmaddr.c "ip maddress".
*
* 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/netdevice.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/sockios.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
static struct {
char *dev;
int family;
} filter;
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip maddr [ add | del ] MULTIADDR dev STRING\n");
fprintf(stderr, " ip maddr show [ dev STRING ]\n");
exit(-1);
}
static int parse_hex(char *str, unsigned char *addr, size_t size)
{
int len = 0;
while (*str && (len < 2 * size)) {
int tmp;
if (str[1] == 0)
return -1;
if (sscanf(str, "%02x", &tmp) != 1)
return -1;
addr[len] = tmp;
len++;
str += 2;
}
return len;
}
struct ma_info
{
struct ma_info *next;
int index;
int users;
char *features;
char name[IFNAMSIZ];
inet_prefix addr;
};
static void maddr_ins(struct ma_info **lst, struct ma_info *m)
{
struct ma_info *mp;
for (; (mp = *lst) != NULL; lst = &mp->next) {
if (mp->index > m->index)
break;
}
m->next = *lst;
*lst = m;
}
static void read_dev_mcast(struct ma_info **result_p)
{
char buf[256];
FILE *fp = fopen("/proc/net/dev_mcast", "r");
if (!fp)
return;
while (fgets(buf, sizeof(buf), fp)) {
char hexa[256];
struct ma_info m;
int len;
int st;
memset(&m, 0, sizeof(m));
sscanf(buf, "%d%s%d%d%s", &m.index, m.name, &m.users, &st,
hexa);
if (filter.dev && strcmp(filter.dev, m.name))
continue;
m.addr.family = AF_PACKET;
len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
if (len >= 0) {
struct ma_info *ma = malloc(sizeof(m));
memcpy(ma, &m, sizeof(m));
ma->addr.bytelen = len;
ma->addr.bitlen = len<<3;
if (st)
ma->features = "static";
maddr_ins(result_p, ma);
}
}
fclose(fp);
}
static void read_igmp(struct ma_info **result_p)
{
struct ma_info m;
char buf[256];
FILE *fp = fopen("/proc/net/igmp", "r");
if (!fp)
return;
memset(&m, 0, sizeof(m));
if (!fgets(buf, sizeof(buf), fp)) {
fclose(fp);
return;
}
m.addr.family = AF_INET;
m.addr.bitlen = 32;
m.addr.bytelen = 4;
while (fgets(buf, sizeof(buf), fp)) {
struct ma_info *ma;
if (buf[0] != '\t') {
sscanf(buf, "%d%s", &m.index, m.name);
continue;
}
if (filter.dev && strcmp(filter.dev, m.name))
continue;
sscanf(buf, "%08x%d", (__u32*)&m.addr.data, &m.users);
ma = malloc(sizeof(m));
memcpy(ma, &m, sizeof(m));
maddr_ins(result_p, ma);
}
fclose(fp);
}
static void read_igmp6(struct ma_info **result_p)
{
char buf[256];
FILE *fp = fopen("/proc/net/igmp6", "r");
if (!fp)
return;
while (fgets(buf, sizeof(buf), fp)) {
char hexa[256];
struct ma_info m;
int len;
memset(&m, 0, sizeof(m));
sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users);
if (filter.dev && strcmp(filter.dev, m.name))
continue;
m.addr.family = AF_INET6;
len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
if (len >= 0) {
struct ma_info *ma = malloc(sizeof(m));
memcpy(ma, &m, sizeof(m));
ma->addr.bytelen = len;
ma->addr.bitlen = len<<3;
maddr_ins(result_p, ma);
}
}
fclose(fp);
}
static void print_maddr(FILE *fp, struct ma_info *list)
{
fprintf(fp, "\t");
if (list->addr.family == AF_PACKET) {
SPRINT_BUF(b1);
fprintf(fp, "link %s", ll_addr_n2a((unsigned char*)list->addr.data,
list->addr.bytelen, 0,
b1, sizeof(b1)));
} else {
char abuf[256];
switch(list->addr.family) {
case AF_INET:
fprintf(fp, "inet ");
break;
case AF_INET6:
fprintf(fp, "inet6 ");
break;
default:
fprintf(fp, "family %d ", list->addr.family);
break;
}
fprintf(fp, "%s",
format_host(list->addr.family,
-1,
list->addr.data,
abuf, sizeof(abuf)));
}
if (list->users != 1)
fprintf(fp, " users %d", list->users);
if (list->features)
fprintf(fp, " %s", list->features);
fprintf(fp, "\n");
}
static void print_mlist(FILE *fp, struct ma_info *list)
{
int cur_index = 0;
for (; list; list = list->next) {
if (oneline) {
cur_index = list->index;
fprintf(fp, "%d:\t%s%s", cur_index, list->name, _SL_);
} else if (cur_index != list->index) {
cur_index = list->index;
fprintf(fp, "%d:\t%s\n", cur_index, list->name);
}
print_maddr(fp, list);
}
}
static int multiaddr_list(int argc, char **argv)
{
struct ma_info *list = NULL;
if (!filter.family)
filter.family = preferred_family;
while (argc > 0) {
if (1) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
}
else if (matches(*argv, "help") == 0)
usage();
if (filter.dev)
duparg2("dev", *argv);
filter.dev = *argv;
}
argv++; argc--;
}
if (!filter.family || filter.family == AF_PACKET)
read_dev_mcast(&list);
if (!filter.family || filter.family == AF_INET)
read_igmp(&list);
if (!filter.family || filter.family == AF_INET6)
read_igmp6(&list);
print_mlist(stdout, list);
return 0;
}
static int multiaddr_modify(int cmd, int argc, char **argv)
{
struct ifreq ifr;
int fd;
memset(&ifr, 0, sizeof(ifr));
if (cmd == RTM_NEWADDR)
cmd = SIOCADDMULTI;
else
cmd = SIOCDELMULTI;
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
if (ifr.ifr_name[0])
duparg("dev", *argv);
strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
} else {
if (matches(*argv, "address") == 0) {
NEXT_ARG();
}
if (matches(*argv, "help") == 0)
usage();
if (ifr.ifr_hwaddr.sa_data[0])
duparg("address", *argv);
if (ll_addr_a2n(ifr.ifr_hwaddr.sa_data,
14, *argv) < 0) {
fprintf(stderr, "Error: \"%s\" is not a legal ll address.\n", *argv);
exit(1);
}
}
argc--; argv++;
}
if (ifr.ifr_name[0] == 0) {
fprintf(stderr, "Not enough information: \"dev\" is required.\n");
exit(-1);
}
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
perror("Cannot create socket");
exit(1);
}
if (ioctl(fd, cmd, (char*)&ifr) != 0) {
perror("ioctl");
exit(1);
}
close(fd);
exit(0);
}
int do_multiaddr(int argc, char **argv)
{
if (argc < 1)
return multiaddr_list(0, NULL);
if (matches(*argv, "add") == 0)
return multiaddr_modify(RTM_NEWADDR, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return multiaddr_modify(RTM_DELADDR, argc-1, argv+1);
if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
|| matches(*argv, "lst") == 0)
return multiaddr_list(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip maddr help\".\n", *argv);
exit(-1);
}