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server-6lo.c
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server-6lo.c
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/*
* Linux IEEE 802.15.4 ping tool
*
* Copyright (C) 2015 Stefan Schmidt <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <stdbool.h>
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/msg.h>
#include <netlink/attr.h>
#include "nl802154.h"
#define MIN_PAYLOAD_LEN 5
#define MAX_PAYLOAD_LEN 105 //116 with short address
#define IEEE802154_ADDR_LEN 8
/* Set the dispatch header to not 6lowpan for compat */
#define NOT_A_6LOWPAN_FRAME 0x00
#define DEBUG 0
enum {
IEEE802154_ADDR_NONE = 0x0,
IEEE802154_ADDR_SHORT = 0x2,
IEEE802154_ADDR_LONG = 0x3,
};
struct ieee802154_addr_sa {
int addr_type;
uint16_t pan_id;
union {
uint8_t hwaddr[IEEE802154_ADDR_LEN];
uint16_t short_addr;
};
};
struct sockaddr_ieee802154 {
sa_family_t family;
struct ieee802154_addr_sa addr;
};
#ifdef _GNU_SOURCE
static const struct option perf_long_opts[] = {
{ "daemon", no_argument, NULL, 'd' },
{ "address", required_argument, NULL, 'a' },
{ "extended", no_argument, NULL, 'e' },
{ "count", required_argument, NULL, 'c' },
{ "size", required_argument, NULL, 's' },
{ "interface", required_argument, NULL, 'i' },
{ "version", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};
#endif
struct config {
char packet_len;
unsigned short packets;
bool extended;
bool server;
char *interface;
struct nl_sock *nl_sock;
int nl802154_id;
struct sockaddr_ieee802154 src;
struct sockaddr_ieee802154 dst;
};
extern char *optarg;
static int nl802154_init(struct config *conf)
{
int err;
conf->nl_sock = nl_socket_alloc();
if (!conf->nl_sock) {
fprintf(stderr, "Failed to allocate netlink socket.\n");
return -ENOMEM;
}
nl_socket_set_buffer_size(conf->nl_sock, 8192, 8192);
if (genl_connect(conf->nl_sock)) {
fprintf(stderr, "Failed to connect to generic netlink.\n");
err = -ENOLINK;
goto out_handle_destroy;
}
conf->nl802154_id = genl_ctrl_resolve(conf->nl_sock, "nl802154");
if (conf->nl802154_id < 0) {
fprintf(stderr, "nl802154 not found.\n");
err = -ENOENT;
goto out_handle_destroy;
}
return 0;
out_handle_destroy:
nl_socket_free(conf->nl_sock);
return err;
}
static void nl802154_cleanup(struct config *conf)
{
nl_close(conf->nl_sock);
nl_socket_free(conf->nl_sock);
}
static int nl_msg_cb(struct nl_msg* msg, void* arg)
{
struct config *conf = arg;
struct nlmsghdr *nlh = nlmsg_hdr(msg);
struct nlattr *attrs[NL802154_ATTR_MAX+1];
uint64_t temp;
struct genlmsghdr *gnlh = (struct genlmsghdr*) nlmsg_data(nlh);
nla_parse(attrs, NL802154_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!attrs[NL802154_ATTR_SHORT_ADDR] || !attrs[NL802154_ATTR_PAN_ID]
|| !attrs[NL802154_ATTR_EXTENDED_ADDR])
return NL_SKIP;
conf->src.family = AF_IEEE802154;
conf->src.addr.pan_id = conf->dst.addr.pan_id = nla_get_u16(attrs[NL802154_ATTR_PAN_ID]);
if (!conf->extended) {
conf->src.addr.addr_type = IEEE802154_ADDR_SHORT;
conf->src.addr.short_addr = nla_get_u16(attrs[NL802154_ATTR_SHORT_ADDR]);
} else {
conf->src.addr.addr_type = IEEE802154_ADDR_LONG;
temp = htobe64(nla_get_u64(attrs[NL802154_ATTR_EXTENDED_ADDR]));
memcpy(&conf->src.addr.hwaddr, &temp, IEEE802154_ADDR_LEN);
}
return NL_SKIP;
}
static int get_interface_info(struct config *conf) {
struct nl_msg *msg;
nl802154_init(conf);
/* Build and send message */
nl_socket_modify_cb(conf->nl_sock, NL_CB_VALID, NL_CB_CUSTOM, nl_msg_cb, conf);
msg = nlmsg_alloc();
genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, conf->nl802154_id, 0, NLM_F_DUMP, NL802154_CMD_GET_INTERFACE, 0);
nla_put_string(msg, NL802154_ATTR_IFNAME, "conf->interface");
nl_send_sync(conf->nl_sock, msg);
nl802154_cleanup(conf);
return 0;
}
#if DEBUG
static void dump_packet(unsigned char *buf, int len) {
int i;
fprintf(stdout, "Packet payload:");
for (i = 0; i < len; i++) {
printf(" %x", buf[i]);
}
printf("\n");
}
#endif
static void init_server(int sd) {
ssize_t len;
unsigned char *buf;
struct sockaddr_ieee802154 src;
socklen_t addrlen;
addrlen = sizeof(src);
len = 0;
fprintf(stdout, "Server mode. Waiting for packets...\n");
buf = (unsigned char *)malloc(MAX_PAYLOAD_LEN);
while (1) {
len = recvfrom(sd, buf, MAX_PAYLOAD_LEN, 0, (struct sockaddr *)&src, &addrlen);
if (len < 0) {
perror("recvfrom");
continue;
}
#if DEBUG
dump_packet(buf, len);
#endif
/* Send same packet back */
len = sendto(sd, buf, len, 0, (struct sockaddr *)&src, addrlen);
if (len < 0) {
perror("sendto");
continue;
}
}
free(buf);
}
static int init_network(struct config *conf) {
int sd;
int ret;
sd = socket(PF_IEEE802154, SOCK_DGRAM, 0);
if (sd < 0) {
perror("socket");
return 1;
}
/* Bind socket on this side */
ret = bind(sd, (struct sockaddr *)&conf->src, sizeof(conf->src));
if (ret) {
perror("bind");
close(sd);
return 1;
}
if (conf->server)
init_server(sd);
//else
//measure_roundtrip(conf, sd); //bisa buat analisa, ambil lagi aja dari wpan-ping
shutdown(sd, SHUT_RDWR);
close(sd);
return 0;
}
int main(int argc, char *argv[]) {
int c, ret;
struct config *conf;
char *dst_addr = NULL;
conf = malloc(sizeof(struct config));
/* Default to interface wpan0 if nothing else is given */
conf->interface = "wpan0";
/* Deafult to minimum packet size */
conf->packet_len = MIN_PAYLOAD_LEN;
/* Default to short addressing */
conf->extended = false;
conf->server = true;
get_interface_info(conf);
init_network(conf);
free(conf);
return 0;
}