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Ignore messages generated by dhcp relay agents (including self); send replies to correct port; more debugging info

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This commit is contained in:
Ted Lemon
1997-02-22 12:28:26 +00:00
parent 11777d4819
commit 75661c6027
2 changed files with 68 additions and 30 deletions
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49
relay/dhcrelay.c
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@@ -42,7 +42,7 @@
#ifndef lint
static char copyright[] =
"$Id: dhcrelay.c,v 1.1 1997/02/22 09:47:09 mellon Exp $ Copyright (c) 1997 The Internet Software Consortium. All rights reserved.\n";
"$Id: dhcrelay.c,v 1.2 1997/02/22 12:28:26 mellon Exp $ Copyright (c) 1997 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
@@ -117,28 +117,30 @@ int main (argc, argv, envp)
usage ();
} else {
struct hostent *he;
sp = (struct server_list *)malloc (sizeof *sp);
if (!sp)
error ("no memory for server.\n");
sp -> next = servers;
he = gethostbyname (argv [i]);
if (!he) {
herror (argv [i]);
} else {
sp = (struct server_list *)malloc (sizeof *sp);
if (!sp)
error ("no memory for server.\n");
sp -> next = servers;
servers = sp;
memcpy (&sp -> to.sin_addr,
he -> h_addr_list [0], he -> h_length);
}
memcpy (&sp -> to.sin_addr,
he -> h_addr_list [0], he -> h_length);
}
}
/* Default to the DHCP/BOOTP port. */
if (!local_port) {
ent = getservbyname ("dhcpc", "udp");
ent = getservbyname ("dhcps", "udp");
if (!ent)
local_port = htons (68);
local_port = htons (67);
else
local_port = ent -> s_port;
endservent ();
}
remote_port = local_port;
remote_port = htons (ntohs (local_port) + 1);
/* We need at least one server. */
if (!sp) {
@@ -158,7 +160,7 @@ int main (argc, argv, envp)
GET_TIME (&cur_time);
/* Discover all the network interfaces. */
discover_interfaces (DISCOVER_SERVER);
discover_interfaces (DISCOVER_RELAY);
/* Start dispatching packets and timeouts... */
dispatch (0);
@@ -176,19 +178,17 @@ void relay (ip, packet, length)
struct interface_info *out;
struct hardware hto;
packet -> giaddr = ip -> primary_address;
/* If it's a bootreply, forward it to the client. */
if (packet -> op == BOOTREPLY) {
#ifndef USE_FALLBACK
if (!packet -> flags & htons (BOOTP_BROADCAST)) {
to.sin_addr = packet -> raw -> ciaddr;
to.sin_port = remote_port; /* XXX */
to.sin_port = remote_port;
} else
#endif
{
to.sin_addr.s_addr = htonl (INADDR_BROADCAST);
to.sin_port = remote_port; /* XXX */
to.sin_port = remote_port;
}
to.sin_family = AF_INET;
#ifdef HAVE_SA_LEN
@@ -220,9 +220,28 @@ void relay (ip, packet, length)
packet, length, out -> primary_address,
&to, &hto) < 0)
debug ("sendpkt: %m");
else
debug ("forwarded BOOTREPLY for %s to %s",
print_hw_addr (packet -> htype, packet -> hlen,
packet -> chaddr),
inet_ntoa (to.sin_addr));
return;
}
/* If giaddr is set on a BOOTREQUEST, ignore it - it's already
been gatewayed. */
if (packet -> giaddr.s_addr) {
note ("ignoring BOOTREQUEST with giaddr of %s\n",
inet_ntoa (packet -> giaddr));
return;
}
/* Set the giaddr so the server can figure out what net it's
from and so that we can later forward the response to the
correct net. */
packet -> giaddr = ip -> primary_address;
/* Otherwise, it's a BOOTREQUEST, so forward it to all the
servers. */
for (sp = servers; sp; sp = sp -> next) {