296 lines
7.2 KiB
C
296 lines
7.2 KiB
C
/*
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* Copyright (c) 2000 - 2004 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kadmin_locl.h"
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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struct kadm_port {
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char *port;
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unsigned short def_port;
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struct kadm_port *next;
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} *kadm_ports;
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static void
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add_kadm_port(krb5_context contextp, const char *service, unsigned int port)
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{
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struct kadm_port *p;
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p = malloc(sizeof(*p));
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if(p == NULL) {
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krb5_warnx(contextp, "failed to allocate %lu bytes\n",
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(unsigned long)sizeof(*p));
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return;
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}
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p->port = strdup(service);
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p->def_port = port;
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p->next = kadm_ports;
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kadm_ports = p;
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}
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static void
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add_standard_ports (krb5_context contextp)
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{
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add_kadm_port(contextp, "kerberos-adm", 749);
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}
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/*
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* parse the set of space-delimited ports in `str' and add them.
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* "+" => all the standard ones
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* otherwise it's port|service[/protocol]
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*/
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void
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parse_ports(krb5_context contextp, const char *str)
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{
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char p[128];
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while(strsep_copy(&str, " \t", p, sizeof(p)) != -1) {
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if(strcmp(p, "+") == 0)
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add_standard_ports(contextp);
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else
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add_kadm_port(contextp, p, 0);
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}
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}
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static pid_t pgrp;
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sig_atomic_t term_flag, doing_useful_work;
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static RETSIGTYPE
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sigchld(int sig)
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{
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int status;
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/*
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* waitpid() is async safe. will return -1 or 0 on no more zombie
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* children
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*/
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while ((waitpid(-1, &status, WNOHANG)) > 0)
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;
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SIGRETURN(0);
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}
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static RETSIGTYPE
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terminate(int sig)
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{
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if(getpid() == pgrp) {
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/* parent */
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term_flag = 1;
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signal(sig, SIG_IGN);
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killpg(pgrp, sig);
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} else {
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/* child */
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if(doing_useful_work)
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term_flag = 1;
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else
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exit(0);
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}
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SIGRETURN(0);
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}
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static int
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spawn_child(krb5_context contextp, int *socks,
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unsigned int num_socks, int this_sock)
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{
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int e;
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size_t i;
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struct sockaddr_storage __ss;
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struct sockaddr *sa = (struct sockaddr *)&__ss;
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socklen_t sa_size = sizeof(__ss);
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krb5_socket_t s;
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pid_t pid;
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krb5_address addr;
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char buf[128];
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size_t buf_len;
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s = accept(socks[this_sock], sa, &sa_size);
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if(rk_IS_BAD_SOCKET(s)) {
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krb5_warn(contextp, rk_SOCK_ERRNO, "accept");
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return 1;
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}
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e = krb5_sockaddr2address(contextp, sa, &addr);
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if(e)
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krb5_warn(contextp, e, "krb5_sockaddr2address");
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else {
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e = krb5_print_address (&addr, buf, sizeof(buf),
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&buf_len);
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if(e)
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krb5_warn(contextp, e, "krb5_print_address");
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else
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krb5_warnx(contextp, "connection from %s", buf);
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krb5_free_address(contextp, &addr);
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}
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pid = fork();
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if(pid == 0) {
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for(i = 0; i < num_socks; i++)
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rk_closesocket(socks[i]);
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dup2(s, STDIN_FILENO);
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dup2(s, STDOUT_FILENO);
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if(s != STDIN_FILENO && s != STDOUT_FILENO)
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rk_closesocket(s);
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return 0;
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} else {
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rk_closesocket(s);
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}
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return 1;
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}
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static void
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wait_for_connection(krb5_context contextp,
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krb5_socket_t *socks, unsigned int num_socks)
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{
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unsigned int i;
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int e;
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fd_set orig_read_set, read_set;
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int status, max_fd = -1;
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FD_ZERO(&orig_read_set);
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for(i = 0; i < num_socks; i++) {
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#ifdef FD_SETSIZE
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if (socks[i] >= FD_SETSIZE)
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errx (1, "fd too large");
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#endif
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FD_SET(socks[i], &orig_read_set);
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max_fd = max(max_fd, socks[i]);
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}
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pgrp = getpid();
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if(setpgid(0, pgrp) < 0)
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err(1, "setpgid");
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signal(SIGTERM, terminate);
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signal(SIGINT, terminate);
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signal(SIGCHLD, sigchld);
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while (term_flag == 0) {
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read_set = orig_read_set;
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e = select(max_fd + 1, &read_set, NULL, NULL, NULL);
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if(rk_IS_SOCKET_ERROR(e)) {
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if(rk_SOCK_ERRNO != EINTR)
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krb5_warn(contextp, rk_SOCK_ERRNO, "select");
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} else if(e == 0)
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krb5_warnx(contextp, "select returned 0");
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else {
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for(i = 0; i < num_socks; i++) {
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if(FD_ISSET(socks[i], &read_set))
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if(spawn_child(contextp, socks, num_socks, i) == 0)
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return;
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}
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}
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}
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signal(SIGCHLD, SIG_IGN);
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while ((waitpid(-1, &status, WNOHANG)) > 0)
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;
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exit(0);
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}
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void
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start_server(krb5_context contextp, const char *port_str)
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{
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int e;
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struct kadm_port *p;
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krb5_socket_t *socks = NULL, *tmp;
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unsigned int num_socks = 0;
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int i;
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if (port_str == NULL)
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port_str = "+";
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parse_ports(contextp, port_str);
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for(p = kadm_ports; p; p = p->next) {
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struct addrinfo hints, *ai, *ap;
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char portstr[32];
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memset (&hints, 0, sizeof(hints));
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hints.ai_flags = AI_PASSIVE;
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hints.ai_socktype = SOCK_STREAM;
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e = getaddrinfo(NULL, p->port, &hints, &ai);
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if(e) {
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snprintf(portstr, sizeof(portstr), "%u", p->def_port);
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e = getaddrinfo(NULL, portstr, &hints, &ai);
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}
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if(e) {
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krb5_warn(contextp, krb5_eai_to_heim_errno(e, errno),
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"%s", portstr);
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continue;
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}
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i = 0;
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for(ap = ai; ap; ap = ap->ai_next)
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i++;
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tmp = realloc(socks, (num_socks + i) * sizeof(*socks));
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if(tmp == NULL) {
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krb5_warnx(contextp, "failed to reallocate %lu bytes",
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(unsigned long)(num_socks + i) * sizeof(*socks));
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continue;
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}
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socks = tmp;
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for(ap = ai; ap; ap = ap->ai_next) {
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krb5_socket_t s = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol);
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if(rk_IS_BAD_SOCKET(s)) {
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krb5_warn(contextp, rk_SOCK_ERRNO, "socket");
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continue;
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}
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socket_set_reuseaddr(s, 1);
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socket_set_ipv6only(s, 1);
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if (rk_IS_SOCKET_ERROR(bind (s, ap->ai_addr, ap->ai_addrlen))) {
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krb5_warn(contextp, rk_SOCK_ERRNO, "bind");
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rk_closesocket(s);
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continue;
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}
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if (rk_IS_SOCKET_ERROR(listen (s, SOMAXCONN))) {
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krb5_warn(contextp, rk_SOCK_ERRNO, "listen");
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rk_closesocket(s);
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continue;
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}
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socks[num_socks++] = s;
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}
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freeaddrinfo (ai);
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}
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if(num_socks == 0)
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krb5_errx(contextp, 1, "no sockets to listen to - exiting");
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wait_for_connection(contextp, socks, num_socks);
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}
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