Boolean Socket::changePort(Port newPort) {
int oldSocketNum = fSocketNum;
closeSocket(fSocketNum);
fSocketNum = setupDatagramSocket(fEnv, newPort);
if (fSocketNum < 0) {
fEnv.taskScheduler().turnOffBackgroundReadHandling(oldSocketNum);
return False;
}
if (fSocketNum != oldSocketNum) { // the socket number has changed, so move any event handling for it:
fEnv.taskScheduler().moveSocketHandling(oldSocketNum, fSocketNum);
}
return True;
}
Boolean Socket::changePort(Port newPort) {
int oldSocketNum = fSocketNum;
unsigned oldReceiveBufferSize = getReceiveBufferSize(fEnv, fSocketNum);
unsigned oldSendBufferSize = getSendBufferSize(fEnv, fSocketNum);
closeSocket(fSocketNum);
fSocketNum = setupDatagramSocket(fEnv, newPort);
if (fSocketNum < 0) {
fEnv.taskScheduler().turnOffBackgroundReadHandling(oldSocketNum);
return False;
}
setReceiveBufferTo(fEnv, fSocketNum, oldReceiveBufferSize);
setSendBufferTo(fEnv, fSocketNum, oldSendBufferSize);
if (fSocketNum != oldSocketNum) { // the socket number has changed, so move any event handling for it:
fEnv.taskScheduler().moveSocketHandling(oldSocketNum, fSocketNum);
}
return True;
}
Socket::Socket(UsageEnvironment& env, Port port, Boolean setLoopback)
: fEnv(DefaultUsageEnvironment != NULL ? *DefaultUsageEnvironment : env), fPort(port), fSetLoopback(setLoopback) {
fSocketNum = setupDatagramSocket(fEnv, port, setLoopback);
}
Boolean Socket::changePort(Port newPort) {
closeSocket(fSocketNum);
fSocketNum = setupDatagramSocket(fEnv, newPort, fSetLoopback);
return fSocketNum >= 0;
}
Socket::Socket(UsageEnvironment& env, Port port)
: fEnv(DefaultUsageEnvironment != NULL ? *DefaultUsageEnvironment : env), fPort(port) {
fSocketNum = setupDatagramSocket(fEnv, port);
}
netAddressBits ourIPAddress(UsageEnvironment& env) {
static netAddressBits ourAddress = 0;
int sock = -1;
struct in_addr testAddr;
if (ourAddress == 0) {
// We need to find our source address
struct sockaddr_in fromAddr;
fromAddr.sin_addr.s_addr = 0;
// Get our address by sending a (0-TTL) multicast packet,
// receiving it, and looking at the source address used.
// (This is kinda bogus, but it provides the best guarantee
// that other nodes will think our address is the same as we do.)
do {
loopbackWorks = 0; // until we learn otherwise
testAddr.s_addr = our_inet_addr("228.67.43.91"); // arbitrary
Port testPort(15947); // ditto
sock = setupDatagramSocket(env, testPort);
if (sock < 0) break;
if (!socketJoinGroup(env, sock, testAddr.s_addr)) break;
unsigned char testString[] = "hostIdTest";
unsigned testStringLength = sizeof testString;
if (!writeSocket(env, sock, testAddr, testPort, 0,
testString, testStringLength)) break;
unsigned char readBuffer[20];
struct timeval timeout;
timeout.tv_sec = 5;
timeout.tv_usec = 0;
int bytesRead = readSocket(env, sock,
readBuffer, sizeof readBuffer,
fromAddr, &timeout);
if (bytesRead == 0 // timeout occurred
|| bytesRead != (int)testStringLength
|| strncmp((char*)readBuffer, (char*)testString,
testStringLength) != 0) {
break;
}
loopbackWorks = 1;
} while (0);
if (!loopbackWorks) do {
// We couldn't find our address using multicast loopback
// so try instead to look it up directly.
char hostname[100];
hostname[0] = '\0';
#ifndef CRIS
gethostname(hostname, sizeof hostname);
#endif
if (hostname[0] == '\0') {
env.setResultErrMsg("initial gethostname() failed");
break;
}
#if defined(VXWORKS)
#include <hostLib.h>
if (ERROR == (ourAddress = hostGetByName( hostname ))) break;
#else
struct hostent* hstent
= (struct hostent*)gethostbyname(hostname);
if (hstent == NULL || hstent->h_length != 4) {
env.setResultErrMsg("initial gethostbyname() failed");
break;
}
// Take the first address that's not bad
// (This code, like many others, won't handle IPv6)
netAddressBits addr = 0;
for (unsigned i = 0; ; ++i) {
char* addrPtr = hstent->h_addr_list[i];
if (addrPtr == NULL) break;
netAddressBits a = *(netAddressBits*)addrPtr;
if (!badAddress(a)) {
addr = a;
break;
}
}
if (addr != 0) {
fromAddr.sin_addr.s_addr = addr;
} else {
env.setResultMsg("no address");
break;
}
} while (0);
// Make sure we have a good address:
netAddressBits from = fromAddr.sin_addr.s_addr;
if (badAddress(from)) {
char tmp[100];
sprintf(tmp,
"This computer has an invalid IP address: 0x%x",
(netAddressBits)(ntohl(from)));
env.setResultMsg(tmp);
from = 0;
}
ourAddress = from;
#endif
if (sock >= 0) {
socketLeaveGroup(env, sock, testAddr.s_addr);
closeSocket(sock);
}
// Use our newly-discovered IP address, and the current time,
// to initialize the random number generator's seed:
struct timeval timeNow;
gettimeofday(&timeNow, NULL);
unsigned seed = ourAddress^timeNow.tv_sec^timeNow.tv_usec;
our_srandom(seed);
}
return ourAddress;
}
netAddressBits ourIPAddress(UsageEnvironment& env) {
static netAddressBits ourAddress = 0;
int sock = -1;
struct in_addr testAddr;
if (ReceivingInterfaceAddr != INADDR_ANY) {
// Hack: If we were told to receive on a specific interface address, then
// define this to be our ip address:
ourAddress = ReceivingInterfaceAddr;
}
if (ourAddress == 0) {
// We need to find our source address
struct sockaddr_in fromAddr;
fromAddr.sin_addr.s_addr = 0;
// Get our address by sending a (0-TTL) multicast packet,
// receiving it, and looking at the source address used.
// (This is kinda bogus, but it provides the best guarantee
// that other nodes will think our address is the same as we do.)
do {
loopbackWorks = 0; // until we learn otherwise
testAddr.s_addr = our_inet_addr("228.67.43.91"); // arbitrary
Port testPort(15947); // ditto
sock = setupDatagramSocket(env, testPort);
if (sock < 0) break;
if (!socketJoinGroup(env, sock, testAddr.s_addr)) break;
unsigned char testString[] = "hostIdTest";
unsigned testStringLength = sizeof testString;
if (!writeSocket(env, sock, testAddr, testPort.num(), 0,
testString, testStringLength)) break;
// Block until the socket is readable (with a 5-second timeout):
fd_set rd_set;
FD_ZERO(&rd_set);
FD_SET((unsigned)sock, &rd_set);
const unsigned numFds = sock+1;
struct timeval timeout;
timeout.tv_sec = 5;
timeout.tv_usec = 0;
int result = select(numFds, &rd_set, NULL, NULL, &timeout);
if (result <= 0) break;
unsigned char readBuffer[20];
int bytesRead = readSocket(env, sock,
readBuffer, sizeof readBuffer,
fromAddr);
if (bytesRead != (int)testStringLength
|| strncmp((char*)readBuffer, (char*)testString, testStringLength) != 0) {
break;
}
// We use this packet's source address, if it's good:
loopbackWorks = !badAddressForUs(fromAddr.sin_addr.s_addr);
} while (0);
if (sock >= 0) {
socketLeaveGroup(env, sock, testAddr.s_addr);
closeSocket(sock);
}
if (!loopbackWorks) do {
// We couldn't find our address using multicast loopback,
// so try instead to look it up directly - by first getting our host name, and then resolving this host name
char hostname[100];
hostname[0] = '\0';
int result = gethostname(hostname, sizeof hostname);
if (result != 0 || hostname[0] == '\0') {
env.setResultErrMsg("initial gethostname() failed");
break;
}
// Try to resolve "hostname" to an IP address:
NetAddressList addresses(hostname);
NetAddressList::Iterator iter(addresses);
NetAddress const* address;
// Take the first address that's not bad:
netAddressBits addr = 0;
while ((address = iter.nextAddress()) != NULL) {
netAddressBits a = *(netAddressBits*)(address->data());
if (!badAddressForUs(a)) {
addr = a;
break;
}
}
// Assign the address that we found to "fromAddr" (as if the 'loopback' method had worked), to simplify the code below:
fromAddr.sin_addr.s_addr = addr;
} while (0);
// Make sure we have a good address:
netAddressBits from = fromAddr.sin_addr.s_addr;
if (badAddressForUs(from)) {
char tmp[100];
sprintf(tmp, "This computer has an invalid IP address: %s", AddressString(from).val());
env.setResultMsg(tmp);
from = 0;
}
ourAddress = from;
// Use our newly-discovered IP address, and the current time,
// to initialize the random number generator's seed:
struct timeval timeNow;
gettimeofday(&timeNow, NULL);
unsigned seed = ourAddress^timeNow.tv_sec^timeNow.tv_usec;
our_srandom(seed);
}
return ourAddress;
}
