freebsd-dev/crypto/heimdal/kadmin/kadm_conn.c
2001-06-21 02:12:07 +00:00

290 lines
7.0 KiB
C

/*
* Copyright (c) 2000 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kadmin_locl.h"
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
RCSID("$Id: kadm_conn.c,v 1.13 2001/05/16 22:06:44 assar Exp $");
struct kadm_port {
char *port;
unsigned short def_port;
struct kadm_port *next;
} *kadm_ports;
static void
add_kadm_port(krb5_context context, const char *service, unsigned int port)
{
struct kadm_port *p;
p = malloc(sizeof(*p));
if(p == NULL) {
krb5_warnx(context, "failed to allocate %lu bytes\n",
(unsigned long)sizeof(*p));
return;
}
p->port = strdup(service);
p->def_port = port;
p->next = kadm_ports;
kadm_ports = p;
}
static void
add_standard_ports (krb5_context context)
{
add_kadm_port(context, "kerberos-adm", 749);
#ifdef KRB4
add_kadm_port(context, "kerberos-master", 751);
#endif
}
/*
* parse the set of space-delimited ports in `str' and add them.
* "+" => all the standard ones
* otherwise it's port|service[/protocol]
*/
void
parse_ports(krb5_context context, const char *str)
{
char p[128];
while(strsep_copy(&str, " \t", p, sizeof(p)) != -1) {
if(strcmp(p, "+") == 0)
add_standard_ports(context);
else
add_kadm_port(context, p, 0);
}
}
static pid_t pgrp;
sig_atomic_t term_flag, doing_useful_work;
static RETSIGTYPE
sigchld(int sig)
{
int status;
waitpid(-1, &status, 0);
SIGRETURN(0);
}
static RETSIGTYPE
terminate(int sig)
{
if(getpid() == pgrp) {
/* parent */
term_flag = 1;
signal(sig, SIG_IGN);
killpg(pgrp, sig);
} else {
/* child */
if(doing_useful_work)
term_flag = 1;
else
exit(0);
}
SIGRETURN(0);
}
static int
spawn_child(krb5_context context, int *socks, int num_socks, int this_sock)
{
int e, i;
struct sockaddr_storage __ss;
struct sockaddr *sa = (struct sockaddr *)&__ss;
socklen_t sa_size = sizeof(__ss);
int s;
pid_t pid;
krb5_address addr;
char buf[128];
size_t buf_len;
s = accept(socks[this_sock], sa, &sa_size);
if(s < 0) {
krb5_warn(context, errno, "accept");
return 1;
}
e = krb5_sockaddr2address(context, sa, &addr);
if(e)
krb5_warn(context, e, "krb5_sockaddr2address");
else {
e = krb5_print_address (&addr, buf, sizeof(buf),
&buf_len);
if(e)
krb5_warn(context, e, "krb5_print_address");
else
krb5_warnx(context, "connection from %s", buf);
krb5_free_address(context, &addr);
}
pid = fork();
if(pid == 0) {
for(i = 0; i < num_socks; i++)
close(socks[i]);
dup2(s, STDIN_FILENO);
dup2(s, STDOUT_FILENO);
if(s != STDIN_FILENO && s != STDOUT_FILENO)
close(s);
return 0;
} else {
close(s);
}
return 1;
}
static int
wait_for_connection(krb5_context context,
int *socks, int num_socks)
{
int i, e;
fd_set orig_read_set, read_set;
int max_fd = -1;
FD_ZERO(&orig_read_set);
for(i = 0; i < num_socks; i++) {
if (socks[i] >= FD_SETSIZE)
errx (1, "fd too large");
FD_SET(socks[i], &orig_read_set);
max_fd = max(max_fd, socks[i]);
}
pgrp = getpid();
if(setpgid(0, pgrp) < 0)
err(1, "setpgid");
signal(SIGTERM, terminate);
signal(SIGINT, terminate);
signal(SIGCHLD, sigchld);
while (term_flag == 0) {
read_set = orig_read_set;
e = select(max_fd + 1, &read_set, NULL, NULL, NULL);
if(e < 0) {
if(errno != EINTR)
krb5_warn(context, errno, "select");
} else if(e == 0)
krb5_warnx(context, "select returned 0");
else {
for(i = 0; i < num_socks; i++) {
if(FD_ISSET(socks[i], &read_set))
if(spawn_child(context, socks, num_socks, i) == 0)
return 0;
}
}
}
signal(SIGCHLD, SIG_IGN);
while(1) {
int status;
pid_t pid;
pid = waitpid(-1, &status, 0);
if(pid == -1 && errno == ECHILD)
break;
}
exit(0);
}
int
start_server(krb5_context context)
{
int e;
struct kadm_port *p;
int *socks = NULL, *tmp;
int num_socks = 0;
int i;
for(p = kadm_ports; p; p = p->next) {
struct addrinfo hints, *ai, *ap;
char portstr[32];
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;
e = getaddrinfo(NULL, p->port, &hints, &ai);
if(e) {
snprintf(portstr, sizeof(portstr), "%u", p->def_port);
e = getaddrinfo(NULL, portstr, &hints, &ai);
}
if(e) {
krb5_warn(context, krb5_eai_to_heim_errno(e, errno),
"%s", portstr);
continue;
}
i = 0;
for(ap = ai; ap; ap = ap->ai_next)
i++;
tmp = realloc(socks, (num_socks + i) * sizeof(*socks));
if(tmp == NULL) {
krb5_warnx(context, "failed to reallocate %lu bytes",
(unsigned long)(num_socks + i) * sizeof(*socks));
continue;
}
socks = tmp;
for(ap = ai; ap; ap = ap->ai_next) {
int one = 1;
int s = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol);
if(s < 0) {
krb5_warn(context, errno, "socket");
continue;
}
#if defined(SO_REUSEADDR) && defined(HAVE_SETSOCKOPT)
if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void *)&one,
sizeof(one)) < 0)
krb5_warn(context, errno, "setsockopt");
#endif
if (bind (s, ap->ai_addr, ap->ai_addrlen) < 0) {
krb5_warn(context, errno, "bind");
close(s);
continue;
}
if (listen (s, SOMAXCONN) < 0) {
krb5_warn(context, errno, "listen");
close(s);
continue;
}
socks[num_socks++] = s;
}
freeaddrinfo (ai);
}
if(num_socks == 0)
krb5_errx(context, 1, "no sockets to listen to - exiting");
return wait_for_connection(context, socks, num_socks);
}