/*
* Returns:
* 0 Success.
* ENOENT gethostbyname() failure.
* EAFNOSUPPORT AF_INET address-family not supported.
* EMFILE No more file descriptors available for this process.
* ENFILE No more file descriptors available for the system.
* EACCES The process does not have appropriate privileges.
* ENOBUFS Insufficient resources were available in the system to
* perform the operation.
* ENOMEM Insufficient memory was available to fulfill the request.
* ENOSR There were insufficient STREAMS resources available for the
* operation to complete.
* EADDRNOTAVAIL The specified address is not available from the local
* machine.
* ECONNREFUSED The target address was not listening for connections or
* refused the connection request.
* EINTR The attempt to establish a connection was interrupted by
* delivery of a signal that was caught; the connection will be
* established asynchronously.
* ENETUNREACH No route to the network is present.
* EPROTOTYPE The specified address has a different type than the socket
* bound to the specified peer address.
* ETIMEDOUT The attempt to connect timed out before a connection was
* made.
* ECONNRESET Remote host reset the connection request.
* EHOSTUNREACH The destination host cannot be reached (probably because the
* host is down or a remote router cannot reach it).
* ENETDOWN The local interface used to reach the destination is down.
*/
int
port_open(const char *remote, unsigned short port, int *const fdp)
{
int status = ENOERR;
int sock;
struct sockaddr_in addr;
if (addrbyhost(remote, &addr) != 0)
{
status = ENOENT;
serror("gethostbyname(%s)", remote);
return status;
}
sock = socket(AF_INET, SOCK_STREAM, 0);
if(sock < 0)
{
status = errno;
serror("socket");
return status;
}
#if 0 /* doesnt seem to help. See VOODOO in pqing.c */
{
const int optval = 1;
if(setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
(char *) &optval, (int) sizeof(optval)) < 0)
{
status = errno;
serror("setsockopt SO_KEEPALIVE");
return status;
}
}
#endif
addr.sin_port = htons(port);
if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
status = errno;
serror("connect");
(void) close(sock);
return status;
}
unotice("NET \"%s\" %hu", remote, port);
*fdp = sock;
return status;
}
/*
* Potentially lengthy operation.
*/
ErrorObj*
ldm_clnt_addr(const char* const name, struct sockaddr_in* addr)
{
struct sockaddr_in ad;
ErrorObj* error;
log_assert(NULL != name);
log_assert(NULL != addr);
if (addrbyhost(name, &ad)) {
const char* msg;
if (HOST_NOT_FOUND == h_errno) {
msg = "no such host is known";
}
else if (NO_DATA == h_errno) {
msg = "no address for name";
}
else if (NO_RECOVERY == h_errno) {
msg = "unexpected server failure";
}
else if (TRY_AGAIN == h_errno) {
msg = "try again later";
}
else {
msg = "unknown error";
}
error = ERR_NEW(h_errno, NULL, msg);
}
else {
*addr = ad;
error = NULL;
}
return error;
}
