Blenderwizard/ft_ping
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ip hdr print on non icmp_echorply

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This commit is contained in:
Jolan Rathelot
2025-05-13 08:43:01 -04:00
parent 1985418471
commit a705c42e4f
2 changed files with 39 additions and 4 deletions
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5
.vscode/settings.json vendored
View File

@ -1,3 +1,6 @@
{
"C_Cpp.errorSquiggles": "disabled"
"C_Cpp.errorSquiggles": "disabled",
"files.associations": {
"ip.h": "c"
}
}

38
srcs/main.c
View File

@ -142,6 +142,31 @@ double nsqrt(double a, double prec) {
return c;
}
void print_ip_hdr(int verbose, struct ip* ip_header) {
if (verbose) {
printf("IP Hdr dump:\n ");
for (size_t i = 0; i < sizeof(*ip_header); i++) {
printf("%02x", *((unsigned char*)ip_header + i));
if (i % 2) {
printf(" ");
}
}
printf("\n");
}
printf("Vr HL TOS Len ID Flg off TTL Pro cks Src\tDst\tData\n");
printf(" %1x %1x %02x %04x %04x %1x %04x %02x %02x %04x %s %s ", ip_header->ip_v, ip_header->ip_hl,
ip_header->ip_tos, (ip_header->ip_len > 0x2000) ? ntohs(ip_header->ip_len) : ip_header->ip_len,
ntohs(ip_header->ip_id), (ntohs(ip_header->ip_off) & 0xe000) >> 13, ntohs(ip_header->ip_off) & 0x1fff,
ip_header->ip_ttl, ip_header->ip_p, ntohs(ip_header->ip_sum),
inet_ntoa(*((struct in_addr*)&ip_header->ip_src)), inet_ntoa(*((struct in_addr*)&ip_header->ip_dst)));
unsigned char* cp = (unsigned char*)ip_header + sizeof(*ip_header);
for (size_t l = ip_header->ip_hl << 2; l > sizeof(*ip_header); l--) {
printf("%02x", *cp++);
}
printf("\n");
}
int main(int argc, char** argv) {
struct arguments arguments;
int timeout = 3000;
@ -223,6 +248,9 @@ int main(int argc, char** argv) {
send_ping();
struct sockaddr_in localhost;
inet_pton(AF_INET, "127.0.0.1", &(localhost.sin_addr));
while (!stop) {
int ret = poll(fds, 1, timeout);
if (ret > 0) {
@ -250,7 +278,10 @@ int main(int argc, char** argv) {
char strip[INET_ADDRSTRLEN] = {0};
inet_ntop(AF_INET, &(ip_header->ip_src.s_addr), strip, INET_ADDRSTRLEN);
struct icmphdr* icmp_reply = (struct icmphdr*)(buf + (ip_header->ip_hl << 2));
if (icmp_reply->type == 0) {
if (icmp_reply->type == ICMP_ECHO && ip_header->ip_src.s_addr == localhost.sin_addr.s_addr) {
continue;
} else if (icmp_reply->type != ICMP_ECHOREPLY) {
print_ip_hdr(arguments.verbose, ip_header);
continue;
}
@ -271,8 +302,9 @@ int main(int argc, char** argv) {
((recvt.tv_sec * 1000 + recvt.tv_nsec / 1000000) - (sendt.tv_sec * 1000 + sendt.tv_nsec / 1000000));
tmp += ((double)((recvt.tv_nsec - sendt.tv_nsec) % 1000000) / 1000000.0);
printf("%zd bytes from %s: icmp_seq=%d ttl=%d time=%.3f ms \n", bytes_received - sizeof(struct ip),
strip, icmp_reply->un.echo.sequence, ip_header->ip_ttl, tmp);
printf("%zd bytes from %s: icmp_seq=%d ttl=%d time=%.3f ms %s\n", bytes_received - sizeof(struct ip),
strip, icmp_reply->un.echo.sequence, ip_header->ip_ttl, tmp,
icmp_reply->un.echo.sequence < xmit ? "" : " (DUP!)");
min = (((min) < (tmp)) ? (min) : (tmp));
max = (((max) > (tmp)) ? (max) : (tmp));