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#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/ip_icmp.h>
#include <stdio.h>
#include <string.h>
#include <Kernel/NetworkOrdered.h>
NetworkOrdered<word> internet_checksum(const void* ptr, size_t count)
{
dword checksum = 0;
auto* w = (const word*)ptr;
while (count > 1) {
checksum += convert_between_host_and_network(*w++);
if (checksum & 0x80000000)
checksum = (checksum & 0xffff) | (checksum >> 16);
count -= 2;
}
while (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16);
return ~checksum & 0xffff;
}
int main(int argc, char** argv)
{
int fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (fd < 0) {
perror("socket");
return 1;
}
sockaddr_in peer_address;
memset(&peer_address, 0, sizeof(peer_address));
peer_address.sin_family = AF_INET;
peer_address.sin_port = 0;
peer_address.sin_addr.s_addr = 0x0105a8c0; // 192.168.5.1
struct PingPacket {
struct icmphdr header;
char msg[64 - sizeof(struct icmphdr)];
};
PingPacket ping_packet;
memset(&ping_packet, 0, sizeof(PingPacket));
ping_packet.header.type = 8; // Echo request
strcpy(ping_packet.msg, "Hello there!\n");
ping_packet.header.checksum = htons(internet_checksum(&ping_packet, sizeof(PingPacket)));
int rc = sendto(fd, &ping_packet, sizeof(PingPacket), 0, (const struct sockaddr*)&peer_address, sizeof(sockaddr_in));
if (rc < 0) {
perror("sendto");
return 1;
}
return 0;
}
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