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Userland: Allow ping <hostname> :^)

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This commit is contained in:
Andreas Kling 2019-03-20 03:38:09 +01:00
parent 696f9c5bc0
commit 4ea625e08b
1 changed files with 13 additions and 4 deletions
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17
Userland/ping.cpp
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@ -1,9 +1,11 @@
#include <sys/socket.h> #include <sys/socket.h>
#include <arpa/inet.h> #include <arpa/inet.h>
#include <netinet/ip_icmp.h> #include <netinet/ip_icmp.h>
#include <netinet/in.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <netdb.h>
#include <time.h> #include <time.h>
uint16_t internet_checksum(const void* ptr, size_t count) uint16_t internet_checksum(const void* ptr, size_t count)
@ -33,6 +35,11 @@ inline void timersub(struct timeval* a, struct timeval* b, struct timeval* resul
int main(int argc, char** argv) int main(int argc, char** argv)
{ {
if (argc != 2) {
printf("usage: ping <host>\n");
return 0;
}
int fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); int fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (fd < 0) { if (fd < 0) {
perror("socket"); perror("socket");
@ -46,9 +53,11 @@ int main(int argc, char** argv)
return 1; return 1;
} }
const char* addr_str = "127.0.0.1"; auto* hostent = gethostbyname(argv[1]);
if (argc > 1) if (!hostent) {
addr_str = argv[1]; printf("Lookup failed for '%s'\n", argv[1]);
return 1;
}
pid_t pid = getpid(); pid_t pid = getpid();
@ -57,7 +66,7 @@ int main(int argc, char** argv)
peer_address.sin_family = AF_INET; peer_address.sin_family = AF_INET;
peer_address.sin_port = 0; peer_address.sin_port = 0;
rc = inet_pton(AF_INET, addr_str, &peer_address.sin_addr); peer_address.sin_addr.s_addr = *(const in_addr_t*)hostent->h_addr_list[0];
struct PingPacket { struct PingPacket {
struct icmphdr header; struct icmphdr header;