| 1 | #include <stdlib.h> |
| 2 | #include <unistd.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <errno.h> |
| 6 | #include <sys/socket.h> |
| 7 | #include <netinet/in.h> |
| 8 | #include <arpa/inet.h> |
| 9 | #include <sys/types.h> |
| 10 | |
| 11 | struct icmphdr { |
| 12 | u_int8_t type; |
| 13 | u_int8_t code; |
| 14 | u_int16_t checksum; |
| 15 | u_int16_t id; |
| 16 | u_int16_t seq; |
| 17 | }; |
| 18 | |
| 19 | #define ICMP_NAMEREQ 37 |
| 20 | #define ICMP_NAMEREP 38 |
| 21 | |
| 22 | int main(int argc, char **argv) |
| 23 | { |
| 24 | int ret; |
| 25 | int s; |
| 26 | struct sockaddr_in host; |
| 27 | struct icmphdr data; |
| 28 | |
| 29 | if((s = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) < 0) { |
| 30 | perror("could not create raw socket"); |
| 31 | exit(1); |
| 32 | } |
| 33 | |
| 34 | host.sin_family = AF_INET; |
| 35 | inet_aton("192.168.1.254", &host.sin_addr); |
| 36 | |
| 37 | memset(&data, 0, sizeof(data)); |
| 38 | data.type = ICMP_NAMEREQ; |
| 39 | |
| 40 | ret = sendto(s, &data, sizeof(data), 0, (struct sockaddr *)&host, sizeof(host)); |
| 41 | if(ret < 0) { |
| 42 | perror("sendto"); |
| 43 | } else { |
| 44 | printf("%i\n", ret); |
| 45 | } |
| 46 | close(s); |
| 47 | return(0); |
| 48 | } |