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started working on ICMP probing code

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This commit is contained in:
Steffen Vogel 2017-12-20 10:32:27 +01:00
parent e7ca4adf42
commit 612695e259
1 changed files with 40 additions and 0 deletions
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40
probe.c
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@ -29,6 +29,7 @@
#include <netlink/addr.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include "ts.h"
#include "timing.h"
@ -44,6 +45,45 @@ struct phdr {
uint16_t length;
} __attribute__((packed));
#if 0
#define PAYLOAD_LEN (sizeof(float) * 8);
int probe_icmp(int sd, unsigned short dport, struct timespec *ts)
{
struct timespec ts_req, ts_rep;
char buf[sizeof(struct iphdr) + sizeof(struct icmphdr) + PAYLOAD_LEN];
struct iphdr *ihdr = (struct iphdr *) buf;
struct icmphdr *ichdr = (struct icmphdr *) (ihdr + 1);
char *payload = (char *) (ichdr + 1);
struct msghdr msgh;
struct iovec iov = {
.iov_base = ichdr,
.iov_len = sizeof(struct icmphdr) + PAYLOAD_LEN // ICMP header
};
memset(buf, 0, sizeof(buf));
ichdr->type = ICMP_ECHO;
ichdr->code = 0;
ichdr->checksum = 0;
ichdr->echo.id = 1;
ichdr->echo.sequence = rand();
ichdr->checksum = chksum_rfc1071(ichdr, sizeof(struct icmphdr));
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
if (ts_sendmsg(sd, &msgh, 0, &ts_req))
error(-1, errno, "Failed to send ICMP echo request");
// TODO
}
#endif
int probe_tcp(int sd, unsigned short dport, struct in_addr src, struct in_addr dst, struct timespec *ts)
{
struct timespec ts_syn, ts_ack;