65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* icmp.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: tomoron <tomoron@student.42angouleme.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/04/24 22:49:22 by tomoron #+# #+# */
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/* Updated: 2025/04/25 19:14:34 by tomoron ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "includes/ft_ping.h"
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static void set_packet_data(uint8_t *packet_data)
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{
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int i;
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i = 0;
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while(i < PACKET_DATA_LENGTH)
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{
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packet_data[i] = i;
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i++;
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}
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}
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static uint16_t calc_checksum(void *ptr, size_t len)
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{
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uint32_t res;
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uint16_t *data;
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data = ptr;
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res = 0;
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while (len > 1)
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{
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res += *data;
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data++;
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len -= 2;
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}
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if (len)
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res += *(uint8_t *)data;
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while (res >> 16) {
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res = (res & 0xFFFF) + (res >> 16);
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}
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return(htons(~res));
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}
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t_icmp_echo prepare_icmp_echo(uint16_t sequence, uint16_t identifier)
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{
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t_icmp_echo packet;
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packet.type = 8;
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packet.code = 0;
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packet.identifier = htons(identifier);
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packet.sequence = htons(sequence);
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set_packet_data(packet.data);
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gettimeofday(&packet.time, 0);
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packet.checksum = 0;
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packet.checksum = calc_checksum(&packet, sizeof(t_icmp_echo));
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return(packet);
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}
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