static int common_ping_main(sa_family_t af, char **argv)
{
len_and_sockaddr *lsa;
INIT_G();
#if ENABLE_PING6
while ((++argv)[0] && argv[0][0] == '-') {
if (argv[0][1] == '4') {
af = AF_INET;
continue;
}
if (argv[0][1] == '6') {
af = AF_INET6;
continue;
}
bb_show_usage();
}
#else
argv++;
#endif
G.hostname = *argv;
if (!G.hostname)
bb_show_usage();
#if ENABLE_PING6
lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
#else
lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
#endif
/* Set timer _after_ DNS resolution */
signal(SIGALRM, noresp);
alarm(5); /* give the host 5000ms to respond */
create_icmp_socket(lsa);
G.myid = (uint16_t) getpid();
#if ENABLE_PING6
if (lsa->u.sa.sa_family == AF_INET6)
ping6(lsa);
else
#endif
ping4(lsa);
if (ENABLE_FEATURE_CLEAN_UP)
close(pingsock);
printf("%s is alive!\n", G.hostname);
return EXIT_SUCCESS;
}
/*!
* \brief
* This function pings an IP-Address with a specified Time-To-Live-value.
*
* \param targetIP
* The textual representation of the IP-Address to ping (both IPv4 and IPv6 are accepted)
*
* \param ttl
* The Time-To-Live-value to perform the ping with
*
* \param out
* The Buffer into which the result of the ping-command will be written
*
* \param outSize
* The maximum number of characters that can be written into "out"
*
* \returns
* True if the execution succeded and false otherwise. The following will be written in "out": "TARGET "+TargetIP if the target was reached, "HOP "+HopIP if an intermediate Host was reached or "NO_REPLY" if an execution error occurred. If an internal error occured, a message describing that error will be written.
*
* \remarks
* Writing the "ping"-function in Javascript and calling the iphlpapi.dll (and others) using c-types turned out to be impossible. The reason for that is the fact that calling GetLastError() is not possible using c-types. Therefore it is implemented in c-code and compiled into the crossbear.dll.
*
*/
extern "C" __declspec( dllexport ) bool ping(WCHAR * targetIP, int ttl, WCHAR * out, int outSize){
// Validate the Time-To-Live-Parameter: less than 1 is invalid and more than 255 doesn't make sense and might cause _itow problems
if(ttl<1 || ttl>255){
outPutWstring(std::wstring(L"TTL Parameter invalid"),out,outSize);
return false;
}
// Verify if targetIP is a valid address if yes convert it into a addrinfo-struct
struct addrinfoW *ai;
if(! (0==GetAddrInfoW(targetIP,NULL,NULL,&ai))){
outPutWstring(std::wstring(L"could not parse IP Address : ")+getFormatedLastError(),out,outSize);
return false;
}
// Check if the IP-version of the targetIP is v6 ...
if(ai->ai_family == AF_INET6){
// ... and if it is perform a ping using ICMPv4
return ping6(ai, ttl, out, outSize);
}
// Check if the IP-version of the targetIP is v4 ...
else if(ai->ai_family == AF_INET){
// ... and if it is perform a ping using ICMPv6
return ping4(ai, ttl, out, outSize);
}
// In case the passed address is neither IPv4 nor IPv6: Return an error message
outPutWstring(std::wstring(L"Unknown type of IPAddress"),out,outSize);
FreeAddrInfoW(ai);
return false;
}
