3 * Copyright (c) 1994 Carnegie Mellon University
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software_Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
28 * This program is intended to run on afs DB servers.
29 * Its function is to forward KA requests to a fakeka server
30 * running on an MIT kerberos server.
33 #include <afsconfig.h>
34 #include <afs/param.h>
44 int getopt (int, char * const *, const char *);
49 #define BUFFER_SIZE 2048
54 int num_servers
, cur_server
;
55 struct sockaddr_in
*servers
;
67 setup_servers(int argc
, char **argv
)
75 servers
= malloc(sizeof(*servers
) * num_servers
);
77 perrorexit("malloc failed");
79 for (i
= 0; i
< num_servers
; i
++) {
82 fwdport
= htons(7004);
85 port
= strchr(host
, '/');
89 if (isdigit(port
[0])) {
90 fwdport
= htons(atoi(port
));
93 struct servent
*srv
= getservbyname(port
, "udp");
95 fprintf(stderr
, "%s: unknown service %s\n", prog
, port
);
98 fwdport
= srv
->s_port
;
102 if (isdigit(host
[0])) {
103 fwdaddr
= inet_addr(host
);
106 struct hostent
*h
= gethostbyname(host
);
108 fprintf(stderr
, "%s: unknown host %s\n", prog
, host
);
111 bcopy(h
->h_addr
, &fwdaddr
, 4);
114 servers
[i
].sin_family
= AF_INET
;
115 servers
[i
].sin_addr
.s_addr
= fwdaddr
;
116 servers
[i
].sin_port
= fwdport
;
122 setup_socket(u_short port
)
125 struct sockaddr_in sin
;
127 s
= socket(AF_INET
, SOCK_DGRAM
, 0);
129 perrorexit("Couldn't create socket");
131 sin
.sin_family
= AF_INET
;
132 sin
.sin_addr
.s_addr
= 0;
133 sin
.sin_port
= htons(port
);
135 rv
= bind(s
, (struct sockaddr
*)&sin
, sizeof(sin
));
137 perrorexit("Couldn't bind socket");
144 packet_is_reply(struct sockaddr_in
*from
)
148 for (i
= 0; i
< num_servers
; i
++) {
149 struct sockaddr_in
*sin
= &servers
[i
];
151 if (from
->sin_addr
.s_addr
== sin
->sin_addr
.s_addr
&&
152 from
->sin_port
== sin
->sin_port
)
163 main(int argc
, char **argv
)
170 "usage: %s [-p port] <host>[/port] [host/port ...]\n",
178 while ((c
= getopt(argc
, argv
, "p:")) != -1) {
184 fprintf(stderr
, "%s: invalid option '%c'\n", prog
, c
);
190 * hmm, different implementations of getopt seem to do different things
191 * when there aren't any options. linux sets optind = 1, which I would
192 * call correct, but sunos sets optind = 0. try to do the right thing.
197 setup_servers(argc
- optind
, argv
+ optind
);
198 s
= setup_socket(port
);
200 openlog("ka-forwarder", LOG_PID
, LOG_DAEMON
);
203 char buf
[BUFFER_SIZE
], *bufp
, *sendptr
;
204 struct sockaddr_in from
, reply
, *to
;
209 fromlen
= sizeof(from
);
211 rv
= recvfrom(s
, bufp
, sizeof(buf
) - 8,
212 0, (struct sockaddr
*)&from
, &fromlen
);
214 syslog(LOG_ERR
, "recvfrom: %m");
219 if (packet_is_reply(&from
)) {
220 /* this is a reply, forward back to user */
223 reply
.sin_family
= AF_INET
;
224 bcopy(bufp
, &reply
.sin_addr
.s_addr
, 4);
225 bcopy(bufp
+ 4, &reply
.sin_port
, 2);
230 /* this is a request, forward to server */
232 cur_server
= (cur_server
+ 1) % num_servers
;
233 to
= &servers
[cur_server
];
235 bcopy(&from
.sin_addr
.s_addr
, bufp
- 8, 4);
236 bcopy(&from
.sin_port
, bufp
- 4, 2);
244 strcpy(a1
, inet_ntoa(from
.sin_addr
));
245 strcpy(a2
, inet_ntoa(to
->sin_addr
));
247 syslog(LOG_INFO
, "forwarding %"AFS_SIZET_FMT
" bytes from %s/%d to %s/%d\n",
248 sendlen
, a1
, htons(from
.sin_port
), a2
, htons(to
->sin_port
));
251 rv
= sendto(s
, sendptr
, sendlen
,
252 0, (struct sockaddr
*)to
, sizeof(*to
));
254 syslog(LOG_ERR
, "sendto: %m");