/* $NetBSD: connect.c,v 1.3 2018/04/29 05:36:04 spz Exp $ */
/*
* Copyright (c) 1997-2005 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 "kdc_locl.h"
/*
* a tuple describing on what to listen
*/
struct port_desc{
int family;
int type;
int port;
};
/* the current ones */
static struct port_desc *ports;
static size_t num_ports;
static pid_t bonjour_pid = -1;
/*
* add `family, port, protocol' to the list with duplicate suppresion.
*/
static void
add_port(krb5_context context,
int family, int port, const char *protocol)
{
int type;
size_t i;
if(strcmp(protocol, "udp") == 0)
type = SOCK_DGRAM;
else if(strcmp(protocol, "tcp") == 0)
type = SOCK_STREAM;
else
return;
for(i = 0; i < num_ports; i++){
if(ports[i].type == type
&& ports[i].port == port
&& ports[i].family == family)
return;
}
ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
if (ports == NULL)
krb5_err (context, 1, errno, "realloc");
ports[num_ports].family = family;
ports[num_ports].type = type;
ports[num_ports].port = port;
num_ports++;
}
/*
* add a triple but with service -> port lookup
* (this prints warnings for stuff that does not exist)
*/
static void
add_port_service(krb5_context context,
int family, const char *service, int port,
const char *protocol)
{
port = krb5_getportbyname (context, service, protocol, port);
add_port (context, family, port, protocol);
}
/*
* add the port with service -> port lookup or string -> number
* (no warning is printed)
*/
static void
add_port_string (krb5_context context,
int family, const char *str, const char *protocol)
{
struct servent *sp;
int port;
sp = roken_getservbyname (str, protocol);
if (sp != NULL) {
port = sp->s_port;
} else {
char *end;
port = htons(strtol(str, &end, 0));
if (end == str)
return;
}
add_port (context, family, port, protocol);
}
/*
* add the standard collection of ports for `family'
*/
static void
add_standard_ports (krb5_context context,
krb5_kdc_configuration *config,
int family)
{
add_port_service(context, family, "kerberos", 88, "udp");
add_port_service(context, family, "kerberos", 88, "tcp");
add_port_service(context, family, "kerberos-sec", 88, "udp");
add_port_service(context, family, "kerberos-sec", 88, "tcp");
if(enable_http)
add_port_service(context, family, "http", 80, "tcp");
if(config->enable_kx509) {
add_port_service(context, family, "kca_service", 9878, "udp");
add_port_service(context, family, "kca_service", 9878, "tcp");
}
}
/*
* parse the set of space-delimited ports in `str' and add them.
* "+" => all the standard ones
* otherwise it's port|service[/protocol]
*/
static void
parse_ports(krb5_context context,
krb5_kdc_configuration *config,
const char *str)
{
char *pos = NULL;
char *p;
char *str_copy = strdup (str);
p = strtok_r(str_copy, " \t", &pos);
while(p != NULL) {
if(strcmp(p, "+") == 0) {
#ifdef HAVE_IPV6
add_standard_ports(context, config, AF_INET6);
#endif
add_standard_ports(context, config, AF_INET);
} else {
char *q = strchr(p, '/');
if(q){
*q++ = 0;
#ifdef HAVE_IPV6
add_port_string(context, AF_INET6, p, q);
#endif
add_port_string(context, AF_INET, p, q);
}else {
#ifdef HAVE_IPV6
add_port_string(context, AF_INET6, p, "udp");
add_port_string(context, AF_INET6, p, "tcp");
#endif
add_port_string(context, AF_INET, p, "udp");
add_port_string(context, AF_INET, p, "tcp");
}
}
p = strtok_r(NULL, " \t", &pos);
}
free (str_copy);
}
/*
* every socket we listen on
*/
struct descr {
krb5_socket_t s;
int type;
int port;
unsigned char *buf;
size_t size;
size_t len;
time_t timeout;
struct sockaddr_storage __ss;
struct sockaddr *sa;
socklen_t sock_len;
char addr_string[128];
};
static void
init_descr(struct descr *d)
{
memset(d, 0, sizeof(*d));
d->sa = (struct sockaddr *)&d->__ss;
d->s = rk_INVALID_SOCKET;
}
/*
* re-initialize all `n' ->sa in `d'.
*/
static void
reinit_descrs (struct descr *d, int n)
{
int i;
for (i = 0; i < n; ++i)
d[i].sa = (struct sockaddr *)&d[i].__ss;
}
/*
* Create the socket (family, type, port) in `d'
*/
static void
init_socket(krb5_context context,
krb5_kdc_configuration *config,
struct descr *d, krb5_address *a, int family, int type, int port)
{
krb5_error_code ret;
struct sockaddr_storage __ss;
struct sockaddr *sa = (struct sockaddr *)&__ss;
krb5_socklen_t sa_size = sizeof(__ss);
init_descr (d);
ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port);
if (ret) {
krb5_warn(context, ret, "krb5_addr2sockaddr");
rk_closesocket(d->s);
d->s = rk_INVALID_SOCKET;
return;
}
if (sa->sa_family != family)
return;
d->s = socket(family, type, 0);
if(rk_IS_BAD_SOCKET(d->s)){
krb5_warn(context, errno, "socket(%d, %d, 0)", family, type);
d->s = rk_INVALID_SOCKET;
return;
}
rk_cloexec(d->s);
#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
{
int one = 1;
setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
}
#endif
d->type = type;
d->port = port;
socket_set_nonblocking(d->s, 1);
if(rk_IS_SOCKET_ERROR(bind(d->s, sa, sa_size))){
char a_str[256];
size_t len;
krb5_print_address (a, a_str, sizeof(a_str), &len);
krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port));
rk_closesocket(d->s);
d->s = rk_INVALID_SOCKET;
return;
}
if(type == SOCK_STREAM && rk_IS_SOCKET_ERROR(listen(d->s, SOMAXCONN))){
char a_str[256];
size_t len;
krb5_print_address (a, a_str, sizeof(a_str), &len);
krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port));
rk_closesocket(d->s);
d->s = rk_INVALID_SOCKET;
return;
}
}
/*
* Allocate descriptors for all the sockets that we should listen on
* and return the number of them.
*/
static int
init_sockets(krb5_context context,
krb5_kdc_configuration *config,
struct descr **desc)
{
krb5_error_code ret;
size_t i, j;
struct descr *d;
int num = 0;
krb5_addresses addresses;
if (explicit_addresses.len) {
addresses = explicit_addresses;
} else {
ret = krb5_get_all_server_addrs (context, &addresses);
if (ret)
krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
}
parse_ports(context, config, port_str);
d = malloc(addresses.len * num_ports * sizeof(*d));
if (d == NULL)
krb5_errx(context, 1, "malloc(%lu) failed",
(unsigned long)num_ports * sizeof(*d));
for (i = 0; i < num_ports; i++){
for (j = 0; j < addresses.len; ++j) {
init_socket(context, config, &d[num], &addresses.val[j],
ports[i].family, ports[i].type, ports[i].port);
if(d[num].s != rk_INVALID_SOCKET){
char a_str[80];
size_t len;
krb5_print_address (&addresses.val[j], a_str,
sizeof(a_str), &len);
kdc_log(context, config, 5, "listening on %s port %u/%s",
a_str,
ntohs(ports[i].port),
(ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
/* XXX */
num++;
}
}
}
krb5_free_addresses (context, &addresses);
d = realloc(d, num * sizeof(*d));
if (d == NULL && num != 0)
krb5_errx(context, 1, "realloc(%lu) failed",
(unsigned long)num * sizeof(*d));
reinit_descrs (d, num);
*desc = d;
return num;
}
/*
*
*/
static const char *
descr_type(struct descr *d)
{
if (d->type == SOCK_DGRAM)
return "udp";
else if (d->type == SOCK_STREAM)
return "tcp";
return "unknown";
}
static void
addr_to_string(krb5_context context,
struct sockaddr *addr, size_t addr_len, char *str, size_t len)
{
krb5_address a;
if(krb5_sockaddr2address(context, addr, &a) == 0) {
if(krb5_print_address(&a, str, len, &len) == 0) {
krb5_free_address(context, &a);
return;
}
krb5_free_address(context, &a);
}
snprintf(str, len, "<family=%d>", addr->sa_family);
}
/*
*
*/
static void
send_reply(krb5_context context,
krb5_kdc_configuration *config,
krb5_boolean prependlength,
struct descr *d,
krb5_data *reply)
{
kdc_log(context, config, 5,
"sending %lu bytes to %s", (unsigned long)reply->length,
d->addr_string);
if(prependlength){
unsigned char l[4];
l[0] = (reply->length >> 24) & 0xff;
l[1] = (reply->length >> 16) & 0xff;
l[2] = (reply->length >> 8) & 0xff;
l[3] = reply->length & 0xff;
if(rk_IS_SOCKET_ERROR(sendto(d->s, l, sizeof(l), 0, d->sa, d->sock_len))) {
kdc_log (context, config,
0, "sendto(%s): %s", d->addr_string,
strerror(rk_SOCK_ERRNO));
return;
}
}
if(rk_IS_SOCKET_ERROR(sendto(d->s, reply->data, reply->length, 0, d->sa, d->sock_len))) {
kdc_log (context, config, 0, "sendto(%s): %s", d->addr_string,
strerror(rk_SOCK_ERRNO));
return;
}
}
/*
* Handle the request in `buf, len' to socket `d'
*/
static void
do_request(krb5_context context,
krb5_kdc_configuration *config,
void *buf, size_t len, krb5_boolean prependlength,
struct descr *d)
{
krb5_error_code ret;
krb5_data reply;
int datagram_reply = (d->type == SOCK_DGRAM);
krb5_kdc_update_time(NULL);
krb5_data_zero(&reply);
ret = krb5_kdc_process_request(context, config,
buf, len, &reply, &prependlength,
d->addr_string, d->sa,
datagram_reply);
if(request_log)
krb5_kdc_save_request(context, request_log, buf, len, &reply, d->sa);
if(reply.length){
send_reply(context, config, prependlength, d, &reply);
krb5_data_free(&reply);
}
if(ret)
kdc_log(context, config, 0,
"Failed processing %lu byte request from %s",
(unsigned long)len, d->addr_string);
}
/*
* Handle incoming data to the UDP socket in `d'
*/
static void
handle_udp(krb5_context context,
krb5_kdc_configuration *config,
struct descr *d)
{
unsigned char *buf;
ssize_t n;
buf = malloc(max_request_udp);
if (buf == NULL){
kdc_log(context, config, 0, "Failed to allocate %lu bytes",
(unsigned long)max_request_udp);
return;
}
d->sock_len = sizeof(d->__ss);
n = recvfrom(d->s, buf, max_request_udp, 0, d->sa, &d->sock_len);
if (rk_IS_SOCKET_ERROR(n)) {
if (rk_SOCK_ERRNO != EAGAIN && rk_SOCK_ERRNO != EINTR)
krb5_warn(context, rk_SOCK_ERRNO, "recvfrom");
} else {
addr_to_string (context, d->sa, d->sock_len,
d->addr_string, sizeof(d->addr_string));
if ((size_t)n == max_request_udp) {
krb5_data data;
krb5_warn(context, errno,
"recvfrom: truncated packet from %s, asking for TCP",
d->addr_string);
krb5_mk_error(context,
KRB5KRB_ERR_RESPONSE_TOO_BIG,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
&data);
send_reply(context, config, FALSE, d, &data);
krb5_data_free(&data);
} else {
do_request(context, config, buf, n, FALSE, d);
}
}
free (buf);
}
static void
clear_descr(struct descr *d)
{
if(d->buf)
memset(d->buf, 0, d->size);
d->len = 0;
if(d->s != rk_INVALID_SOCKET)
rk_closesocket(d->s);
d->s = rk_INVALID_SOCKET;
}
/* remove HTTP %-quoting from buf */
static int
de_http(char *buf)
{
unsigned char *p, *q;
for(p = q = (unsigned char *)buf; *p; p++, q++) {
if(*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
unsigned int x;
if(sscanf((char *)p + 1, "%2x", &x) != 1)
return -1;
*q = x;
p += 2;
} else
*q = *p;
}
*q = '\0';
return 0;
}
#define TCP_TIMEOUT 4
/*
* accept a new TCP connection on `d[parent]' and store it in `d[child]'
*/
static void
add_new_tcp (krb5_context context,
krb5_kdc_configuration *config,
struct descr *d, int parent, int child)
{
krb5_socket_t s;
if (child == -1)
return;
d[child].sock_len = sizeof(d[child].__ss);
s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
if(rk_IS_BAD_SOCKET(s)) {
if (rk_SOCK_ERRNO != EAGAIN && rk_SOCK_ERRNO != EINTR)
krb5_warn(context, rk_SOCK_ERRNO, "accept");
return;
}
#ifdef FD_SETSIZE
if (s >= FD_SETSIZE) {
krb5_warnx(context, "socket FD too large");
rk_closesocket (s);
return;
}
#endif
d[child].s = s;
d[child].timeout = time(NULL) + TCP_TIMEOUT;
d[child].type = SOCK_STREAM;
addr_to_string (context,
d[child].sa, d[child].sock_len,
d[child].addr_string, sizeof(d[child].addr_string));
}
/*
* Grow `d' to handle at least `n'.
* Return != 0 if fails
*/
static int
grow_descr (krb5_context context,
krb5_kdc_configuration *config,
struct descr *d, size_t n)
{
if (d->size - d->len < n) {
unsigned char *tmp;
size_t grow;
grow = max(1024, d->len + n);
if (d->size + grow > max_request_tcp) {
kdc_log(context, config, 0, "Request exceeds max request size (%lu bytes).",
(unsigned long)d->size + grow);
clear_descr(d);
return -1;
}
tmp = realloc (d->buf, d->size + grow);
if (tmp == NULL) {
kdc_log(context, config, 0, "Failed to re-allocate %lu bytes.",
(unsigned long)d->size + grow);
clear_descr(d);
return -1;
}
d->size += grow;
d->buf = tmp;
}
return 0;
}
/*
* Try to handle the TCP data at `d->buf, d->len'.
* Return -1 if failed, 0 if succesful, and 1 if data is complete.
*/
static int
handle_vanilla_tcp (krb5_context context,
krb5_kdc_configuration *config,
struct descr *d)
{
krb5_storage *sp;
uint32_t len;
sp = krb5_storage_from_mem(d->buf, d->len);
if (sp == NULL) {
kdc_log (context, config, 0, "krb5_storage_from_mem failed");
return -1;
}
krb5_ret_uint32(sp, &len);
krb5_storage_free(sp);
if(d->len - 4 >= len) {
memmove(d->buf, d->buf + 4, d->len - 4);
d->len -= 4;
return 1;
}
return 0;
}
/*
* Try to handle the TCP/HTTP data at `d->buf, d->len'.
* Return -1 if failed, 0 if succesful, and 1 if data is complete.
*/
static int
handle_http_tcp (krb5_context context,
krb5_kdc_configuration *config,
struct descr *d)
{
char *s, *p, *t;
void *data;
char *proto;
int len;
s = (char *)d->buf;
/* If its a multi line query, truncate off the first line */
p = strstr(s, "\r\n");
if (p)
*p = 0;
p = NULL;
t = strtok_r(s, " \t", &p);
if (t == NULL) {
kdc_log(context, config, 0,
"Missing HTTP operand (GET) request from %s", d->addr_string);
return -1;
}
t = strtok_r(NULL, " \t", &p);
if(t == NULL) {
kdc_log(context, config, 0,
"Missing HTTP GET data in request from %s", d->addr_string);
return -1;
}
data = malloc(strlen(t));
if (data == NULL) {
kdc_log(context, config, 0, "Failed to allocate %lu bytes",
(unsigned long)strlen(t));
return -1;
}
if(*t == '/')
t++;
if(de_http(t) != 0) {
kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
kdc_log(context, config, 5, "HTTP request: %s", t);
free(data);
return -1;
}
proto = strtok_r(NULL, " \t", &p);
if (proto == NULL) {
kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
free(data);
return -1;
}
len = rk_base64_decode(t, data);
if(len <= 0){
const char *msg =
" 404 Not found\r\n"
"Server: Heimdal/" VERSION "\r\n"
"Cache-Control: no-cache\r\n"
"Pragma: no-cache\r\n"
"Content-type: text/html\r\n"
"Content-transfer-encoding: 8bit\r\n\r\n"
"<TITLE>404 Not found</TITLE>\r\n"
"<H1>404 Not found</H1>\r\n"
"That page doesn't exist, maybe you are looking for "
"<A HREF=\"http://www.h5l.org/\">Heimdal</A>?\r\n";
kdc_log(context, config, 0, "HTTP request from %s is non KDC request", d->addr_string);
kdc_log(context, config, 5, "HTTP request: %s", t);
free(data);
if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) {
kdc_log(context, config, 0, "HTTP write failed: %s: %s",
d->addr_string, strerror(rk_SOCK_ERRNO));
return -1;
}
if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
kdc_log(context, config, 0, "HTTP write failed: %s: %s",
d->addr_string, strerror(rk_SOCK_ERRNO));
return -1;
}
return -1;
}
{
const char *msg =
" 200 OK\r\n"
"Server: Heimdal/" VERSION "\r\n"
"Cache-Control: no-cache\r\n"
"Pragma: no-cache\r\n"
"Content-type: application/octet-stream\r\n"
"Content-transfer-encoding: binary\r\n\r\n";
if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) {
free(data);
kdc_log(context, config, 0, "HTTP write failed: %s: %s",
d->addr_string, strerror(rk_SOCK_ERRNO));
return -1;
}
if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
free(data);
kdc_log(context, config, 0, "HTTP write failed: %s: %s",
d->addr_string, strerror(rk_SOCK_ERRNO));
return -1;
}
}
if ((size_t)len > d->len)
len = d->len;
memcpy(d->buf, data, len);
d->len = len;
free(data);
return 1;
}
/*
* Handle incoming data to the TCP socket in `d[index]'
*/
static void
handle_tcp(krb5_context context,
krb5_kdc_configuration *config,
struct descr *d, int idx, int min_free)
{
unsigned char buf[1024];
int n;
int ret = 0;
if (d[idx].timeout == 0) {
add_new_tcp (context, config, d, idx, min_free);
return;
}
n = recvfrom(d[idx].s, buf, sizeof(buf), 0, NULL, NULL);
if(rk_IS_SOCKET_ERROR(n)){
krb5_warn(context, rk_SOCK_ERRNO, "recvfrom failed from %s to %s/%d",
d[idx].addr_string, descr_type(d + idx),
ntohs(d[idx].port));
return;
} else if (n == 0) {
krb5_warnx(context, "connection closed before end of data after %lu "
"bytes from %s to %s/%d", (unsigned long)d[idx].len,
d[idx].addr_string, descr_type(d + idx),
ntohs(d[idx].port));
clear_descr (d + idx);
return;
}
if (grow_descr (context, config, &d[idx], n))
return;
memcpy(d[idx].buf + d[idx].len, buf, n);
d[idx].len += n;
if(d[idx].len > 4 && d[idx].buf[0] == 0) {
ret = handle_vanilla_tcp (context, config, &d[idx]);
} else if(enable_http &&
d[idx].len >= 4 &&
strncmp((char *)d[idx].buf, "GET ", 4) == 0 &&
strncmp((char *)d[idx].buf + d[idx].len - 4,
"\r\n\r\n", 4) == 0) {
/* remove the trailing \r\n\r\n so the string is NUL terminated */
d[idx].buf[d[idx].len - 4] = '\0';
ret = handle_http_tcp (context, config, &d[idx]);
if (ret < 0)
clear_descr (d + idx);
} else if (d[idx].len > 4) {
kdc_log (context, config,
0, "TCP data of strange type from %s to %s/%d",
d[idx].addr_string, descr_type(d + idx),
ntohs(d[idx].port));
if (d[idx].buf[0] & 0x80) {
krb5_data reply;
kdc_log (context, config, 0, "TCP extension not supported");
ret = krb5_mk_error(context,
KRB5KRB_ERR_FIELD_TOOLONG,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
&reply);
if (ret == 0) {
send_reply(context, config, TRUE, d + idx, &reply);
krb5_data_free(&reply);
}
}
clear_descr(d + idx);
return;
}
if (ret < 0)
return;
else if (ret == 1) {
do_request(context, config,
d[idx].buf, d[idx].len, TRUE, &d[idx]);
clear_descr(d + idx);
}
}
#ifdef HAVE_FORK
static void
handle_islive(int fd)
{
char buf;
int ret;
ret = read(fd, &buf, 1);
if (ret != 1)
exit_flag = -1;
}
#endif
krb5_boolean
realloc_descrs(struct descr **d, unsigned int *ndescr)
{
struct descr *tmp;
size_t i;
tmp = realloc(*d, (*ndescr + 4) * sizeof(**d));
if(tmp == NULL)
return FALSE;
*d = tmp;
reinit_descrs (*d, *ndescr);
memset(*d + *ndescr, 0, 4 * sizeof(**d));
for(i = *ndescr; i < *ndescr + 4; i++)
init_descr (*d + i);
*ndescr += 4;
return TRUE;
}
int
next_min_free(krb5_context context, struct descr **d, unsigned int *ndescr)
{
size_t i;
int min_free;
for(i = 0; i < *ndescr; i++) {
int s = (*d + i)->s;
if(rk_IS_BAD_SOCKET(s))
return i;
}
min_free = *ndescr;
if(!realloc_descrs(d, ndescr)) {
min_free = -1;
krb5_warnx(context, "No memory");
}
return min_free;
}
static void
loop(krb5_context context, krb5_kdc_configuration *config,
struct descr *d, unsigned int ndescr, int islive)
{
while (exit_flag == 0) {
struct timeval tmout;
fd_set fds;
int min_free = -1;
int max_fd = 0;
size_t i;
FD_ZERO(&fds);
if (islive > -1) {
FD_SET(islive, &fds);
max_fd = islive;
}
for (i = 0; i < ndescr; i++) {
if (!rk_IS_BAD_SOCKET(d[i].s)) {
if (d[i].type == SOCK_STREAM &&
d[i].timeout && d[i].timeout < time(NULL)) {
kdc_log(context, config, 1,
"TCP-connection from %s expired after %lu bytes",
d[i].addr_string, (unsigned long)d[i].len);
clear_descr(&d[i]);
continue;
}
#ifndef NO_LIMIT_FD_SETSIZE
if (max_fd < d[i].s)
max_fd = d[i].s;
#ifdef FD_SETSIZE
if (max_fd >= FD_SETSIZE)
krb5_errx(context, 1, "fd too large");
#endif
#endif
FD_SET(d[i].s, &fds);
}
}
tmout.tv_sec = TCP_TIMEOUT;
tmout.tv_usec = 0;
switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
case 0:
break;
case -1:
if (errno != EINTR)
krb5_warn(context, rk_SOCK_ERRNO, "select");
break;
default:
#ifdef HAVE_FORK
if (islive > -1 && FD_ISSET(islive, &fds))
handle_islive(islive);
#endif
for (i = 0; i < ndescr; i++)
if (!rk_IS_BAD_SOCKET(d[i].s) && FD_ISSET(d[i].s, &fds)) {
min_free = next_min_free(context, &d, &ndescr);
if (d[i].type == SOCK_DGRAM)
handle_udp(context, config, &d[i]);
else if (d[i].type == SOCK_STREAM)
handle_tcp(context, config, d, i, min_free);
}
}
}
switch (exit_flag) {
case -1:
kdc_log(context, config, 0,
"KDC worker process exiting because KDC master exited.");
break;
#ifdef SIGXCPU
case SIGXCPU:
kdc_log(context, config, 0, "CPU time limit exceeded");
break;
#endif
case SIGINT:
case SIGTERM:
kdc_log(context, config, 0, "Terminated");
break;
default:
kdc_log(context, config, 0, "Unexpected exit reason: %d", exit_flag);
break;
}
}
#ifdef __APPLE__
static void
bonjour_kid(krb5_context context, krb5_kdc_configuration *config, const char *argv0, int *islive)
{
char buf;
if (do_bonjour > 0) {
bonjour_announce(context, config);
while (read(0, &buf, 1) == 1)
continue;
_exit(0);
}
if ((bonjour_pid = fork()) != 0)
return;
close(islive[0]);
if (dup2(islive[1], 0) == -1)
err(1, "failed to announce with bonjour (dup)");
if (islive[1] != 0)
close(islive[1]);
execlp(argv0, "kdc", "--bonjour", NULL);
err(1, "failed to announce with bonjour (exec)");
}
#endif
#ifdef HAVE_FORK
static void
kill_kids(pid_t *pids, int max_kids, int sig)
{
int i;
for (i=0; i < max_kids; i++)
if (pids[i] > 0)
kill(sig, pids[i]);
if (bonjour_pid > 0)
kill(sig, bonjour_pid);
}
static int
reap_kid(krb5_context context, krb5_kdc_configuration *config,
pid_t *pids, int max_kids, int options)
{
pid_t pid;
char *what;
int status;
int i = 0; /* quiet warnings */
pid = waitpid(-1, &status, options);
if (pid < 1)
return 0;
if (pid != bonjour_pid) {
for (i=0; i < max_kids; i++) {
if (pids[i] == pid)
break;
}
if (i == max_kids) {
/* XXXrcd: this should not happen, have to do something, though */
return 0;
}
}
if (pid == bonjour_pid)
what = "bonjour";
else
what = "worker";
if (WIFEXITED(status))
kdc_log(context, config, 0, "KDC reaped %s process: %d, exit status: %d",
what, (int)pid, WEXITSTATUS(status));
else if (WIFSIGNALED(status))
kdc_log(context, config, 0, "KDC reaped %s process: %d, term signal %d%s",
what, (int)pid, WTERMSIG(status),
WCOREDUMP(status) ? " (core dumped)" : "");
else
kdc_log(context, config, 0, "KDC reaped %s process: %d",
what, (int)pid);
if (pid == bonjour_pid) {
bonjour_pid = (pid_t)-1;
return 0;
} else {
pids[i] = (pid_t)-1;
return 1;
}
}
static int
reap_kids(krb5_context context, krb5_kdc_configuration *config,
pid_t *pids, int max_kids)
{
int reaped = 0;
for (;;) {
if (reap_kid(context, config, pids, max_kids, WNOHANG) == 0)
break;
reaped++;
}
return reaped;
}
static void
select_sleep(int microseconds)
{
struct timeval tv;
tv.tv_sec = microseconds / 1000000;
tv.tv_usec = microseconds % 1000000;
select(0, NULL, NULL, NULL, &tv);
}
#endif
void
start_kdc(krb5_context context,
krb5_kdc_configuration *config, const char *argv0)
{
struct timeval tv1;
struct timeval tv2;
struct descr *d;
unsigned int ndescr;
pid_t pid = -1;
#ifdef HAVE_FORK
pid_t *pids;
int max_kdcs = config->num_kdc_processes;
int num_kdcs = 0;
int i;
int islive[2];
#endif
#ifdef __APPLE__
if (do_bonjour > 0)
bonjour_kid(context, config, argv0, NULL);
#endif
#ifdef HAVE_FORK
#ifdef _SC_NPROCESSORS_ONLN
if (max_kdcs < 1)
max_kdcs = sysconf(_SC_NPROCESSORS_ONLN);
#endif
if (max_kdcs < 1)
max_kdcs = 1;
pids = calloc(max_kdcs, sizeof(*pids));
if (!pids)
krb5_err(context, 1, errno, "malloc");
/*
* We open a socketpair of which we hand one end to each of our kids.
* When we exit, for whatever reason, the children will notice an EOF
* on their end and be able to cleanly exit.
*/
if (socketpair(PF_LOCAL, SOCK_STREAM, 0, islive) == -1)
krb5_errx(context, 1, "socketpair");
socket_set_nonblocking(islive[1], 1);
#endif
ndescr = init_sockets(context, config, &d);
if(ndescr <= 0)
krb5_errx(context, 1, "No sockets!");
#ifdef HAVE_FORK
# ifdef __APPLE__
if (do_bonjour < 0)
bonjour_kid(context, config, argv0, islive);
# endif
kdc_log(context, config, 0, "KDC started master process pid=%d", getpid());
#else
kdc_log(context, config, 0, "KDC started pid=%d", getpid());
#endif
roken_detach_finish(NULL, daemon_child);
tv1.tv_sec = 0;
tv1.tv_usec = 0;
#ifdef HAVE_FORK
if (!testing_flag) {
/* Note that we might never execute the body of this loop */
while (exit_flag == 0) {
/* Slow down the creation of KDCs... */
gettimeofday(&tv2, NULL);
if (tv1.tv_sec == tv2.tv_sec && tv2.tv_usec - tv1.tv_usec < 25000) {
#if 0 /* XXXrcd: should print a message... */
kdc_log(context, config, 0, "Spawning KDCs too quickly, "
"pausing for 50ms");
#endif
select_sleep(12500);
continue;
}
if (num_kdcs >= max_kdcs) {
num_kdcs -= reap_kid(context, config, pids, max_kdcs, 0);
continue;
}
if (num_kdcs > 0)
num_kdcs -= reap_kids(context, config, pids, max_kdcs);
pid = fork();
switch (pid) {
case 0:
close(islive[0]);
loop(context, config, d, ndescr, islive[1]);
exit(0);
case -1:
/* XXXrcd: hmmm, do something useful?? */
kdc_log(context, config, 0,
"KDC master process could not fork worker process");
sleep(10);
break;
default:
for (i=0; i < max_kdcs; i++) {
if (pids[i] < 1) {
pids[i] = pid;
break;
}
}
kdc_log(context, config, 0, "KDC worker process started: %d",
pid);
num_kdcs++;
gettimeofday(&tv1, NULL);
break;
}
}
/* Closing these sockets should cause the kids to die... */
close(islive[0]);
close(islive[1]);
/* Close our listener sockets before terminating workers */
for (i = 0; i < ndescr; ++i)
clear_descr(&d[i]);
gettimeofday(&tv1, NULL);
tv2 = tv1;
/* Reap every 10ms, terminate stragglers once a second, give up after 10 */
for (;;) {
struct timeval tv3;
num_kdcs -= reap_kids(context, config, pids, max_kdcs);
if (num_kdcs == 0 && bonjour_pid <= 0)
goto end;
/*
* Using select to sleep will fail with EINTR if we receive a
* SIGCHLD. This is desirable.
*/
select_sleep(10000);
gettimeofday(&tv3, NULL);
if (tv3.tv_sec - tv1.tv_sec > 10 ||
(tv3.tv_sec - tv1.tv_sec == 10 && tv3.tv_usec >= tv1.tv_usec))
break;
if (tv3.tv_sec - tv2.tv_sec > 1 ||
(tv3.tv_sec - tv2.tv_sec == 1 && tv3.tv_usec >= tv2.tv_usec)) {
kill_kids(pids, max_kdcs, SIGTERM);
tv2 = tv3;
}
}
/* Kill stragglers and reap every 200ms, give up after 15s */
for (;;) {
kill_kids(pids, max_kdcs, SIGKILL);
num_kdcs -= reap_kids(context, config, pids, max_kdcs);
if (num_kdcs == 0 && bonjour_pid <= 0)
break;
select_sleep(200000);
gettimeofday(&tv2, NULL);
if (tv2.tv_sec - tv1.tv_sec > 15 ||
(tv2.tv_sec - tv1.tv_sec == 15 && tv2.tv_usec >= tv1.tv_usec))
break;
}
end:
kdc_log(context, config, 0, "KDC master process exiting", pid);
free(pids);
} else {
loop(context, config, d, ndescr, -1);
kdc_log(context, config, 0, "KDC exiting", pid);
}
#else
loop(context, config, d, ndescr, -1);
kdc_log(context, config, 0, "KDC exiting", pid);
#endif
free(d);
}