Namonay/ft_ping
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vauden
2024-11-19 18:57:33 +01:00
parent 6cd5b0618d
commit 0058189d72
1 changed files with 9 additions and 9 deletions
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18
src/main.c
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@@ -10,8 +10,8 @@ static int ft_ping(const int sock, const uint16_t seq, const struct sockaddr_in
memset(packet.data, 0, sizeof(packet.data)); memset(packet.data, 0, sizeof(packet.data));
packet.icmp_hdr = (struct net_icmp_header *)packet.data; packet.icmp_hdr = (struct net_icmp_header *)packet.data;
packet.icmp_hdr->type = 8; packet.icmp_hdr->type = 8; // ICMP_ECHO
packet.icmp_hdr->code = 0; packet.icmp_hdr->code = 0; // Always 0 for a ICMP_ECHO
packet.icmp_hdr->id = getpid(); packet.icmp_hdr->id = getpid();
packet.icmp_hdr->seq = seq; packet.icmp_hdr->seq = seq;
packet.icmp_hdr->checksum = make_checksum((uint16_t *)packet.icmp_hdr, sizeof(packet.icmp_hdr)); packet.icmp_hdr->checksum = make_checksum((uint16_t *)packet.icmp_hdr, sizeof(packet.icmp_hdr));
@@ -35,7 +35,7 @@ static int ft_recv(const int sock, const uint16_t seq, const double start, const
double time; double time;
uint16_t checksum; uint16_t checksum;
packet.icmp_hdr = (struct net_icmp_header *)(packet.data + 20); packet.icmp_hdr = (struct net_icmp_header *)(packet.data + 20); // get the packet icmp_header (starts at 20 bytes)
memset(packet.data, 0, sizeof(packet.data)); memset(packet.data, 0, sizeof(packet.data));
packet.n_bytes = recvfrom(sock, packet.data, sizeof(packet.data), 0, (struct sockaddr *)&packet.addr, (socklen_t *)&len); packet.n_bytes = recvfrom(sock, packet.data, sizeof(packet.data), 0, (struct sockaddr *)&packet.addr, (socklen_t *)&len);
if (packet.n_bytes < 1) if (packet.n_bytes < 1)
@@ -78,7 +78,7 @@ static bool init_socket(int *sock, struct sockaddr_in *dst, char *host, int ttl)
dst->sin_family = AF_INET; dst->sin_family = AF_INET;
dst->sin_port = 0; dst->sin_port = 0;
if (gethostbyname(host) == NULL && inet_aton(host, &dst->sin_addr) == 0) if (gethostbyname(host) == NULL && inet_aton(host, &dst->sin_addr) == 0) // Resolve the ip of the host and check if the ip is valid
{ {
fprintf(stderr, "ERROR : %s is an unknown host\n", host); fprintf(stderr, "ERROR : %s is an unknown host\n", host);
return (false); return (false);
@@ -93,7 +93,7 @@ static bool init_socket(int *sock, struct sockaddr_in *dst, char *host, int ttl)
timeout.tv_usec = 0; timeout.tv_usec = 0;
setsockopt(*sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)); // use the timeval struct to set a timeout to our socket setsockopt(*sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)); // use the timeval struct to set a timeout to our socket
if (ttl != -1) if (ttl != -1)
setsockopt(*sock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); setsockopt(*sock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); // set the ttl (Time To Live) value if the parameter is given
return (true); return (true);
} }
@@ -110,7 +110,7 @@ int main(int argc, char **argv)
return (0); return (0);
if (!init_socket(&socket_fd, &dst_addr, argv[optind], flags.ttl)) if (!init_socket(&socket_fd, &dst_addr, argv[optind], flags.ttl))
return (-1); return (-1);
ip = inet_ntoa(get_addr_by_hostname(argv[optind])); ip = inet_ntoa(get_addr_by_hostname(argv[optind])); // get the ip as a string
if (flags.verbose) if (flags.verbose)
printf("PING %s (%s) : %d data bytes, id 0x%04x = %d\n", argv[optind], ip, (PACKET_SIZE - 8), getpid(), getpid()); printf("PING %s (%s) : %d data bytes, id 0x%04x = %d\n", argv[optind], ip, (PACKET_SIZE - 8), getpid(), getpid());
else else
@@ -127,10 +127,10 @@ int main(int argc, char **argv)
flags.count--; flags.count--;
if (flags.count == 0) if (flags.count == 0)
break; break;
if (flags.preload_count <= 0) if (flags.preload_count > 0)
usleep(flags.interval * 1000000);
else
flags.preload_count--; flags.preload_count--;
else
usleep(flags.interval * 1000000);
} }
print_recap(argv[optind], stats); print_recap(argv[optind], stats);
close(socket_fd); close(socket_fd);