/*

 * 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 <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"

#include "json_print.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"

		"       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 = { .addr.family = AF_PACKET };

		int len;

		int st;

		sscanf(buf, "%d%s%d%d%s", &m.index, m.name, &m.users, &st,

		       hexa);

		if (filter.dev && strcmp(filter.dev, m.name))

			continue;

		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 = {

		.addr.family = AF_INET,

		.addr.bitlen = 32,

		.addr.bytelen = 4,

	};

	char buf[256];

	FILE *fp = fopen("/proc/net/igmp", "r");

	if (!fp)

		return;

	if (!fgets(buf, sizeof(buf), fp)) {

		fclose(fp);

		return;

	}

	while (fgets(buf, sizeof(buf), fp)) {

		struct ma_info *ma;

		if (buf[0] != '\t') {

			size_t len;

			sscanf(buf, "%d%s", &m.index, m.name);

			len = strlen(m.name);

			if (m.name[len - 1] == ':')

				m.name[len - 1] = '\0';

			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 = { .addr.family = AF_INET6 };

		int len;

		sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users);

		if (filter.dev && strcmp(filter.dev, m.name))

			continue;

		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)

{

	print_string(PRINT_FP, NULL, "\t", NULL);

	open_json_object(NULL);

	if (list->addr.family == AF_PACKET) {

		SPRINT_BUF(b1);

		print_string(PRINT_FP, NULL, "link  ", NULL);

		print_color_string(PRINT_ANY, COLOR_MAC, "link", "%s",

				   ll_addr_n2a((void *)list->addr.data, list->addr.bytelen,

					       0, b1, sizeof(b1)));

	} else {

		print_string(PRINT_ANY, "family", "%-5s ",

			     family_name(list->addr.family));

		print_color_string(PRINT_ANY, ifa_family_color(list->addr.family),

				   "address", "%s",

				   format_host(list->addr.family,

					       -1, list->addr.data));

	}

	if (list->users != 1)

		print_uint(PRINT_ANY, "users", " users %u", list->users);

	if (list->features)

		print_string(PRINT_ANY, "features", " %s", list->features);

	print_string(PRINT_FP, NULL, "\n", NULL);

	close_json_object();

}

static void print_mlist(FILE *fp, struct ma_info *list)

{

	int cur_index = 0;

	new_json_obj(json);

	for (; list; list = list->next) {

		if (list->index != cur_index || oneline) {

			if (cur_index) {

				close_json_array(PRINT_JSON, NULL);

				close_json_object();

			}

			open_json_object(NULL);

			print_uint(PRINT_ANY, "ifindex", "%d:", list->index);

			print_color_string(PRINT_ANY, COLOR_IFNAME,

					   "ifname", "\t%s", list->name);

			print_nl();

			cur_index = list->index;

			open_json_array(PRINT_JSON, "maddr");

		}

		print_maddr(fp, list);

	}

	if (cur_index) {

		close_json_array(PRINT_JSON, NULL);

		close_json_object();

	}

	delete_json_obj();

}

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 family;

	int fd;

	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);

			if (get_ifname(ifr.ifr_name, *argv))

				invarg("\"dev\" not a valid ifname", *argv);

		} 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);

	}

	switch (preferred_family) {

	case AF_INET6:

	case AF_PACKET:

	case AF_INET:

		family = preferred_family;

		break;

	default:

		family = AF_INET;

	}

	fd = socket(family, 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);

}