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// $Id$
#include "Multicast_Manager.h"
#include "ace/Mem_Map.h"
// Initialize all the static member vars.
int Multicast_Manager::received_host_count = 0;
Host_Elem *Multicast_Manager::drwho_list = 0;
Host_Elem *Multicast_Manager::current_ptr = 0;
// Names of hosts to query for friend info.
char *Multicast_Manager::host_names[] =
{
"tango.cs.wustl.edu",
0 // The NULL entry...
};
void
Multicast_Manager::insert_default_hosts (void)
{
// Enter the static list of hosts into the dynamic table!
for (char **np = host_names;
*np != 0;
np++)
Multicast_Manager::add_host (*np);
}
// Inserts all the names in FILENAME into the list of hosts to
// contact.
int
Multicast_Manager::insert_hosts_from_file (const char *filename)
{
ACE_Mem_Map mmap (filename);
char *host_ptr = (char *) mmap.addr ();
if (host_ptr == 0)
return -1;
else
{
for (char *end_ptr = host_ptr + mmap.size ();
host_ptr < end_ptr;
)
{
Multicast_Manager::add_host (host_ptr);
while (*host_ptr != '\n')
host_ptr++;
*host_ptr++ = '\0';
}
return 0;
}
}
// Returns the IP host address for the next unexamined host in the
// list. If no more unexamined hosts remain a 0 is returned, else a
// 1.
int
Multicast_Manager::get_next_host_addr (in_addr &host_addr)
{
for (Multicast_Manager::current_ptr = Multicast_Manager::current_ptr == 0 ? Multicast_Manager::drwho_list : Multicast_Manager::current_ptr->next;
Multicast_Manager::current_ptr != 0;
Multicast_Manager::current_ptr = Multicast_Manager::current_ptr->next)
{
const char *host_name = Multicast_Manager::current_ptr->host_name;
hostent *hp = Multicast_Manager::get_host_entry (host_name);
if (hp == 0)
{
ACE_ERROR ((LM_ERROR,
"%s: host unknown.\n",
host_name));
continue;
}
Multicast_Manager::received_host_count++;
ACE_OS::memcpy (&host_addr,
hp->h_addr,
sizeof host_addr);
ACE_OS::memcpy (&Multicast_Manager::current_ptr->host_addr,
hp->h_addr,
sizeof host_addr);
return 1;
}
return 0;
}
// This function attempts to get the internet address for either a
// hostname or hostnumber. The function makes the simplifying
// assumption that hostnames begin with an alphabetic character!
hostent *
Multicast_Manager::get_host_entry (const char *host)
{
static hostent host_entry;
hostent *hp;
if (isdigit (*host)) // IP address.
{
u_long ia = ACE_OS::inet_addr (host);
if (ia == (u_long) -1)
hp = 0;
else
hp = ACE_OS::gethostbyaddr ((char *) &ia,
sizeof ia,
AF_INET);
}
else
// Host name.
hp = ACE_OS::gethostbyname (host);
return hp == 0 ? 0 : (hostent *) memcpy (&host_entry, hp, sizeof *hp);
}
// Adds an additional new host to the list of host machines.
void
Multicast_Manager::add_host (const char *host_name)
{
ACE_NEW (Multicast_Manager::drwho_list,
Host_Elem (host_name,
Multicast_Manager::drwho_list));
}
void
Multicast_Manager::checkoff_host (in_addr host_addr)
{
for (Host_Elem *tmp = Multicast_Manager::drwho_list;
tmp != 0;
tmp = tmp->next)
if (ACE_OS::memcmp (&tmp->host_addr.s_addr,
&host_addr.s_addr,
sizeof host_addr.s_addr) == 0)
{
tmp->checked_off = 1;
Multicast_Manager::received_host_count--;
return;
}
}
int
Multicast_Manager::get_next_non_responding_host (const char *&host_name)
{
for (Multicast_Manager::current_ptr = Multicast_Manager::current_ptr == 0 ? Multicast_Manager::drwho_list : Multicast_Manager::current_ptr->next;
Multicast_Manager::current_ptr != 0;
Multicast_Manager::current_ptr = Multicast_Manager::current_ptr->next)
if (Multicast_Manager::current_ptr->checked_off == 0)
{
host_name = Multicast_Manager::current_ptr->host_name;
return 1;
}
return 0;
}
Host_Elem::Host_Elem (const char *h_name,
Host_Elem *n)
: host_name (h_name),
checked_off (0),
next (n)
{
}
int
Multicast_Manager::outstanding_hosts_remain (void)
{
return Multicast_Manager::received_host_count > 0;
}
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