int probe_ttl(int fd, int ttl)
{
int i;
char sndbuf[mtu];
struct probehdr *hdr = (struct probehdr*)sndbuf;
memset(sndbuf, 0, mtu);
restart:
for (i=0; i<10; i++) {
int res;
hdr->ttl = ttl;
switch (family) {
case AF_INET6:
((struct sockaddr_in6 *)&target)->sin6_port = htons(base_port + hisptr);
break;
case AF_INET:
((struct sockaddr_in *)&target)->sin_port = htons(base_port + hisptr);
break;
}
gettimeofday(&hdr->tv, NULL);
his[hisptr].hops = ttl;
his[hisptr].sendtime = hdr->tv;
if (sendto(fd, sndbuf, mtu-overhead, 0, (struct sockaddr *)&target, targetlen) > 0)
break;
res = recverr(fd, ttl);
his[hisptr].hops = 0;
if (res==0)
return 0;
if (res > 0)
goto restart;
}
hisptr = (hisptr + 1) & 63;
if (i<10) {
data_wait(fd);
if (recv(fd, sndbuf, sizeof(sndbuf), MSG_DONTWAIT) > 0) {
printf("%2d?: reply received 8)\n", ttl);
return 0;
}
return recverr(fd, ttl);
}
printf("%2d: send failed\n", ttl);
return 0;
}
int probe_ttl (int fd, int ttl)
{
int i;
char sndbuf[mtu];
struct probehdr *hdr = (struct probehdr *) sndbuf;
restart:
for (i = 0; i < 10; i++)
{
int res;
hdr->ttl = ttl;
gettimeofday (&hdr->tv, NULL);
if (send (fd, sndbuf, mtu - overhead, 0) > 0)
break;
res = recverr (fd, ttl);
if (res == 0)
return 0;
if (res > 0)
goto restart;
}
if (i < 10)
{
int res;
data_wait (fd);
if (recv (fd, sndbuf, sizeof (sndbuf), MSG_DONTWAIT) > 0)
{
printf ("%2d?: reply received 8)\n", ttl);
return 0;
}
res = recverr (fd, ttl);
if (res == 1)
goto restart;
return res;
}
printf ("%2d: send failed\n", ttl);
return 0;
}
int probe_ttl(int fd, int ttl)
{
int i;
struct probehdr *hdr = pktbuf;
memset(pktbuf, 0, mtu);
restart:
for (i=0; i<10; i++) {
int res;
hdr->ttl = ttl;
target.sin_port = htons(base_port + hisptr);
gettimeofday(&hdr->tv, NULL);
his[hisptr].hops = ttl;
his[hisptr].sendtime = hdr->tv;
if (sendto(fd, pktbuf, mtu-overhead, 0, (struct sockaddr*)&target, sizeof(target)) > 0)
break;
res = recverr(fd, ttl);
his[hisptr].hops = 0;
if (res==0)
return 0;
if (res > 0)
goto restart;
}
hisptr = (hisptr + 1)&63;
if (i<10) {
data_wait(fd);
if (recv(fd, pktbuf, mtu, MSG_DONTWAIT) > 0) {
printf("%2d?: reply received 8)\n", ttl);
return 0;
}
return recverr(fd, ttl);
}
printf("%2d: send failed\n", ttl);
return 0;
}
uint32_t probe_mtu(unsigned int mtu, unsigned int *new_mtu) {
unsigned int retry = 0;
uint32_t error;
int ret;
char buf[max_mtu];
memset(buf, 0, sizeof(buf));
while (retry < 10) {
#ifdef DEBUG
printf("probe_mtu retry %d\n", retry);
#endif
ret = sendto(sockfd, buf, mtu - headerlen, 0, target, target_len);
error = get_error(new_mtu);
#ifdef DEBUG
printf("probe_mtu error %d\n", error);
#endif
if (error != 0) {
if (error != EMSGSIZE && error != ECONNREFUSED) {
++retry;
continue;
} else {
return error;
}
}
data_wait();
if (recv(sockfd, buf, sizeof(buf), MSG_DONTWAIT) > 0) {
#ifdef DEBUG
printf("probe_mtu got response -> active port -> change port");
#endif
set_port(target, base_port + retry);
}
++retry;
continue;
}
// return the last error
return error;
}
