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/*
* kdc/network.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* Network code for Kerberos v5 KDC.
*/
#include "k5-int.h"
#include "com_err.h"
#include "kdc_util.h"
#include "extern.h"
#include "kdc5_err.h"
#include <ctype.h>
#ifdef KRB5_USE_INET
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/time.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <arpa/inet.h>
extern int errno;
static int *udp_port_fds = (int *) NULL;
static u_short *udp_port_nums = (u_short *) NULL;
static int n_udp_ports = 0;
static int max_udp_ports = 0;
static fd_set select_fds;
static int select_nfds;
static krb5_error_code add_port(u_short port)
{
int i;
int *new_fds;
u_short *new_ports;
int new_max;
for (i=0; i < n_udp_ports; i++) {
if (udp_port_nums[i] == port)
return 0;
}
if (n_udp_ports >= max_udp_ports) {
new_max = max_udp_ports + 10;
new_fds = realloc(udp_port_fds, new_max * sizeof(int));
if (new_fds == 0)
return ENOMEM;
udp_port_fds = new_fds;
new_ports = realloc(udp_port_nums, new_max * sizeof(u_short));
if (new_ports == 0)
return ENOMEM;
udp_port_nums = new_ports;
max_udp_ports = new_max;
}
udp_port_nums[n_udp_ports++] = port;
return 0;
}
krb5_error_code
setup_network(prog)
const char *prog;
{
struct sockaddr_in sin;
krb5_error_code retval;
u_short port;
char *cp;
int i;
FD_ZERO(&select_fds);
select_nfds = 0;
memset((char *)&sin, 0, sizeof(sin));
/* Handle each realm's ports */
for (i=0; i<kdc_numrealms; i++) {
cp = kdc_realmlist[i]->realm_ports;
while (cp && *cp) {
if (*cp == ',' || isspace(*cp)) {
cp++;
continue;
}
port = strtoul(cp, &cp, 10);
if (cp == 0)
break;
retval = add_port(port);
if (retval)
return retval;
}
}
for (i=0; i<n_udp_ports; i++) {
if ((udp_port_fds[i] = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
retval = errno;
com_err(prog, 0, "Cannot create server socket on port %d",
udp_port_nums[i]);
return(retval);
}
sin.sin_port = htons(udp_port_nums[i]);
if (bind(udp_port_fds[i], (struct sockaddr *) &sin,
sizeof(sin)) == -1) {
retval = errno;
com_err(prog, 0, "Cannot bind server socket on port %d",
udp_port_nums[i]);
return(retval);
}
FD_SET(udp_port_fds[i], &select_fds);
if (udp_port_fds[i]+1 > select_nfds)
select_nfds = udp_port_fds[i]+1;
}
return 0;
}
void process_packet(port_fd, prog, portnum)
int port_fd;
const char *prog;
int portnum;
{
int cc, saddr_len;
krb5_fulladdr faddr;
krb5_error_code retval;
struct sockaddr_in saddr;
krb5_address addr;
krb5_data request;
krb5_data *response;
char pktbuf[MAX_DGRAM_SIZE];
if (port_fd < 0)
return;
saddr_len = sizeof(saddr);
cc = recvfrom(port_fd, pktbuf, sizeof(pktbuf), 0,
(struct sockaddr *)&saddr, &saddr_len);
if (cc == -1) {
if (errno != EINTR)
com_err(prog, errno, "while receiving from network");
return;
}
if (!cc)
return; /* zero-length packet? */
request.length = cc;
request.data = pktbuf;
faddr.port = ntohs(saddr.sin_port);
faddr.address = &addr;
addr.addrtype = ADDRTYPE_INET;
addr.length = 4;
/* this address is in net order */
addr.contents = (krb5_octet *) &saddr.sin_addr;
if ((retval = dispatch(&request, &faddr, portnum, &response))) {
com_err(prog, retval, "while dispatching");
return;
}
cc = sendto(port_fd, response->data, response->length, 0,
(struct sockaddr *)&saddr, saddr_len);
if (cc == -1) {
krb5_free_data(kdc_context, response);
com_err(prog, errno, "while sending reply to %s/%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
return;
}
if (cc != response->length) {
krb5_free_data(kdc_context, response);
com_err(prog, 0, "short reply write %d vs %d\n",
response->length, cc);
return;
}
krb5_free_data(kdc_context, response);
return;
}
krb5_error_code
listen_and_process(prog)
const char *prog;
{
int nfound;
fd_set readfds;
int i;
if (udp_port_fds == (int *) NULL)
return KDC5_NONET;
while (!signal_requests_exit) {
readfds = select_fds;
nfound = select(select_nfds, &readfds, 0, 0, 0);
if (nfound == -1) {
if (errno == EINTR)
continue;
com_err(prog, errno, "while selecting for network input");
continue;
}
for (i=0; i<n_udp_ports; i++) {
if (FD_ISSET(udp_port_fds[i], &readfds)) {
process_packet(udp_port_fds[i], prog, udp_port_nums[i]);
nfound--;
if (nfound == 0)
break;
}
}
}
return 0;
}
krb5_error_code
closedown_network(prog)
const char *prog;
{
int i;
if (udp_port_fds == (int *) NULL)
return KDC5_NONET;
for (i=0; i<n_udp_ports; i++) {
if (udp_port_fds[i] >= 0)
(void) close(udp_port_fds[i]);
}
free(udp_port_fds);
free(udp_port_nums);
return 0;
}
#endif /* INET */
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