FreeBSD-5.3/usr.sbin/mount_portalfs/pt_tcplisten.c
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
* All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* Modified by Duncan Barclay.
*
* 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.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)pt_tcp.c 8.3 (Berkeley) 3/27/94
*
* pt_tcp.c,v 1.1.1.1 1994/05/26 06:34:34 rgrimes Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.sbin/mount_portalfs/pt_tcplisten.c,v 1.4 2004/08/07 04:27:50 imp Exp $");
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "portald.h"
/*
* Key will be tcplisten/host/port
*
* Create a TCP socket bound to the requested host and port.
* If the host is "ANY" the receving address will be set to INADDR_ANY.
* If the port is 0 the caller must find out the returned port number
* using a call to getsockname.
*
* XXX! The owner of the socket will be root rather then the user. This
* may cause remote auth (identd) to return unexpected results.
*
*/
int portal_tcplisten(pcr, key, v, kso, fdp)
struct portal_cred *pcr;
char *key;
char **v;
int kso;
int *fdp;
{
char host[MAXHOSTNAMELEN];
char port[MAXHOSTNAMELEN];
char *p = key + (v[1] ? strlen(v[1]) : 0);
char *q;
struct hostent *hp;
struct servent *sp;
struct in_addr **ipp;
struct in_addr *ip[2];
struct in_addr ina;
u_short s_port;
int any = 0;
struct sockaddr_in sain;
q = strchr(p, '/');
if (q == 0 || q - p >= sizeof(host))
return (EINVAL);
*q = '\0';
snprintf(host, sizeof(host), "%s", p);
p = q + 1;
q = strchr(p, '/');
if (q)
*q = '\0';
if (strlen(p) >= sizeof(port))
return (EINVAL);
snprintf(port, sizeof(port), "%s", p);
if (strcmp(host, "ANY") == 0) {
any = 1;
} else {
hp = gethostbyname(host);
if (hp != 0) {
ipp = (struct in_addr **) hp->h_addr_list;
} else {
ina.s_addr = inet_addr(host);
if (ina.s_addr == INADDR_NONE)
return (EINVAL);
ip[0] = &ina;
ip[1] = 0;
ipp = ip;
}
}
#ifdef DEBUG
if (any)
printf("INADDR_ANY to be used for hostname\n");
else
printf("inet address for %s is %s\n", host, inet_ntoa(*ipp[0]));
#endif
sp = getservbyname(port, "tcp");
if (sp != NULL) {
s_port = (u_short) sp->s_port;
} else {
s_port = strtoul(port, &p, 0);
if (*p != '\0')
return (EINVAL);
s_port = htons(s_port);
}
if ((ntohs(s_port) != 0) &&
(ntohs(s_port) <= IPPORT_RESERVED) &&
(pcr->pcr_uid != 0))
return (EPERM);
#ifdef DEBUG
printf("port number for %s is %d\n", port, ntohs(s_port));
#endif
memset(&sain, 0, sizeof(sain));
sain.sin_len = sizeof(sain);
sain.sin_family = AF_INET;
sain.sin_port = s_port;
if (any) {
int so;
int sock;
so = socket(AF_INET, SOCK_STREAM, 0);
if (so < 0) {
syslog(LOG_ERR, "socket: %m");
return (errno);
}
sain.sin_addr.s_addr = INADDR_ANY;
if (bind(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
listen(so, 1);
if ((sock = accept(so, (struct sockaddr *)0, (int *)0)) == -1) {
syslog(LOG_ERR, "accept: %m");
(void) close(so);
return (errno);
}
*fdp = sock;
(void) close(so);
return (0);
}
syslog(LOG_ERR, "bind: %m");
(void) close(so);
return (errno);
}
while (ipp[0]) {
int so;
int sock;
so = socket(AF_INET, SOCK_STREAM, 0);
if (so < 0) {
syslog(LOG_ERR, "socket: %m");
return (errno);
}
sain.sin_addr = *ipp[0];
if (bind(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
listen(so, 1);
if ((sock = accept(so, (struct sockaddr *)0, (int *)0)) == -1) {
syslog(LOG_ERR, "accept: %m");
(void) close(so);
return (errno);
}
*fdp = sock;
(void) close(so);
return (0);
}
(void) close(so);
ipp++;
}
syslog(LOG_ERR, "bind: %m");
return (errno);
}