NetBSD/sbin/mount_portal/pt_tcp.c

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/* $NetBSD: pt_tcp.c,v 1.19 2005/02/09 13:57:57 xtraeme Exp $ */
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/*
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* 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 University nor the names of its contributors
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* 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.
*
* from: Id: pt_tcp.c,v 1.1 1992/05/25 21:43:09 jsp Exp
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* @(#)pt_tcp.c 8.5 (Berkeley) 4/28/95
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*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: pt_tcp.c,v 1.19 2005/02/09 13:57:57 xtraeme Exp $");
#endif /* not lint */
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
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#include <sys/types.h>
#include <sys/param.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
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#include <netdb.h>
#include "portald.h"
/*
* Key will be tcp/host/port[/"priv"]
* Create a TCP socket connected to the
* requested host and port.
* Some trailing suffix values have special meanings.
* An unrecognised suffix is an error.
*/
int
portal_tcp(struct portal_cred *pcr, char *key, char **v, int kso, int *fdp)
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{
char host[MAXHOSTNAMELEN];
char port[MAXHOSTNAMELEN];
char *p = key + (v[1] ? strlen(v[1]) : 0);
char *q;
int priv = 0;
struct addrinfo hints, *res, *lres;
int so = -1;
const char *cause = "unknown";
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q = strchr(p, '/');
if (q == 0 || q - p >= sizeof(host))
return (EINVAL);
*q = '\0';
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if (strlcpy(host, p, sizeof(host)) >= sizeof(host))
return (EINVAL);
p = q + 1;
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q = strchr(p, '/');
if (q)
*q = '\0';
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if (strlcpy(port, p, sizeof(port)) >= sizeof(port))
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return (EINVAL);
if (q) {
p = q + 1;
if (strcmp(p, "priv") == 0) {
if (pcr->pcr_uid == 0)
priv = 1;
else
return (EPERM);
} else {
return (EINVAL);
}
}
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memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if (getaddrinfo(host, port, &hints, &res) != 0)
return(EINVAL);
for (lres = res; lres; lres = lres->ai_next) {
if (priv)
so = rresvport((int *) 0);
else
so = socket(lres->ai_family, lres->ai_socktype,
lres->ai_protocol);
if (so < 0) {
cause = "socket";
continue;
}
if (connect(so, lres->ai_addr, lres->ai_addrlen) != 0) {
cause = "connect";
(void)close(so);
so = -1;
continue;
}
*fdp = so;
errno = 0;
break;
}
if (so < 0)
syslog(LOG_WARNING, "%s: %m", cause);
freeaddrinfo(res);
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return (errno);
}