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90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* Copyright (C) 2017 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys_shell_commands
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* @{
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*
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* @file
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* @brief Shell command for sending raw text on network
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*
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* @author Martine Lenders <m.lenders@fu-berlin.de>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "net/gnrc.h"
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#include "net/gnrc.h"
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#include "net/gnrc/netif/hdr.h"
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#include "net/ipv6/addr.h"
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#include "shell.h"
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#include "container.h"
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static int _gnrc_netif_send(int argc, char **argv)
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{
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netif_t *iface;
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uint8_t addr[GNRC_NETIF_L2ADDR_MAXLEN];
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size_t addr_len;
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gnrc_pktsnip_t *pkt, *hdr;
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gnrc_netif_hdr_t *nethdr;
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uint8_t flags = 0x00;
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if (argc < 4) {
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printf("usage: %s <if> [<L2 addr>|bcast] <data>\n", argv[0]);
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return 1;
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}
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iface = netif_get_by_name(argv[1]);
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if (!iface) {
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printf("error: invalid interface given\n");
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return 1;
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}
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/* parse address */
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addr_len = gnrc_netif_addr_from_str(argv[2], addr);
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if (addr_len == 0) {
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if (strcmp(argv[2], "bcast") == 0) {
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flags |= GNRC_NETIF_HDR_FLAGS_BROADCAST;
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}
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else {
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printf("error: invalid address given\n");
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return 1;
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}
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}
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/* put packet together */
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pkt = gnrc_pktbuf_add(NULL, argv[3], strlen(argv[3]), GNRC_NETTYPE_UNDEF);
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if (pkt == NULL) {
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printf("error: packet buffer full\n");
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return 1;
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}
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hdr = gnrc_netif_hdr_build(NULL, 0, addr, addr_len);
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if (hdr == NULL) {
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printf("error: packet buffer full\n");
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gnrc_pktbuf_release(pkt);
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return 1;
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}
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pkt = gnrc_pkt_prepend(pkt, hdr);
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nethdr = (gnrc_netif_hdr_t *)hdr->data;
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nethdr->flags = flags;
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/* and send it */
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if (gnrc_netif_send(container_of(iface, gnrc_netif_t, netif), pkt) < 1) {
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printf("error: unable to send\n");
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gnrc_pktbuf_release(pkt);
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return 1;
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}
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return 0;
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}
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SHELL_COMMAND(txtsnd, "Sends a custom string as is over the link layer", _gnrc_netif_send);
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