89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
#include "ft_ping.h"
|
|
|
|
uint16_t calculate_checksum(uint16_t *data, int len)
|
|
{
|
|
uint32_t checksum = 0;
|
|
|
|
while (len > 1)
|
|
{
|
|
checksum += *data++;
|
|
len -= 2;
|
|
}
|
|
if (len == 1)
|
|
checksum += *(uint8_t *)data;
|
|
|
|
while (checksum >> 16)
|
|
checksum = (checksum & 0xFFFF) + (checksum >> 16);
|
|
printf("checksum is : %X\n", (uint16_t)~checksum);
|
|
return (~checksum);
|
|
}
|
|
|
|
int ft_ping(int sock, int seq, struct sockaddr_in dst)
|
|
{
|
|
unsigned char data[2048];
|
|
int len;
|
|
struct icmp_header *icmp_hdr = (struct icmp_header *)data;
|
|
|
|
memset(data, 0, sizeof(data));
|
|
sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
|
|
if (sock < 0)
|
|
{
|
|
fprintf(stderr, "ERROR : socket() failed\n");
|
|
return (0);
|
|
}
|
|
dst.sin_family = AF_INET;
|
|
memset(icmp_hdr, 0, sizeof(icmp_hdr));
|
|
icmp_hdr->type = ICMP_ECHO;
|
|
icmp_hdr->code = 0;
|
|
icmp_hdr->id = getpid();
|
|
icmp_hdr->seq = seq;
|
|
icmp_hdr->checksum = calculate_checksum((uint16_t *)icmp_hdr, sizeof(icmp_hdr));
|
|
if (sendto(sock, data, sizeof(data), 0, (struct sockaddr *)&dst, sizeof(dst)) == -1)
|
|
{
|
|
fprintf(stderr, "ERROR : sendto() failed\n");
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
int ft_recv(int sock, int seq, char *ip)
|
|
{
|
|
unsigned char data[2048];
|
|
struct icmp_header *icmp_recv_hdr = (struct icmp_header *)(data + 20);
|
|
int len;
|
|
struct sockaddr_in addr;
|
|
recvfrom(sock, data, sizeof(data), 0, (struct sockaddr *)&addr, &len);
|
|
|
|
// while (recvfrom(sock, data, sizeof(data), 0, &addr, &len) > 0 && icmp_recv_hdr->type != 0);
|
|
printf("%d bytes from %s: icmp_seq:%d time:placeholder", len, ip, icmp_recv_hdr->seq);
|
|
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int sock;
|
|
struct sockaddr_in dst;
|
|
int seq = 1;
|
|
char *ip;
|
|
if (argc != 2 || argv[1] == NULL || argv[1][0] == 0)
|
|
{
|
|
fprintf(stderr, "ERROR : usage : ping {-v?} [ADRESS]\n");
|
|
return (0);
|
|
}
|
|
if (inet_aton(argv[1], (struct in_addr *)&dst.sin_addr.s_addr) == 0 && gethostbyname(argv[1]) == NULL)
|
|
{
|
|
fprintf(stderr, "ERROR : %s is an invalid adress\n", argv[1]);
|
|
return (0);
|
|
}
|
|
ip = inet_ntoa(dst.sin_addr);
|
|
bind(sock, (struct sockaddr *)&dst, sizeof(dst));
|
|
while (1)
|
|
{
|
|
ft_ping(sock, seq, dst);
|
|
ft_recv(sock, seq, ip);
|
|
seq++;
|
|
sleep(1);
|
|
}
|
|
close(sock);
|
|
return (0);
|
|
} |