BSD 4_4_Lite2 release

[unix-history] / usr / src / sbin / mount_portal / pt_tcp.c

/*
* Copyright (c) 1992, 1993, 1994
*      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.
*
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 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    8.5 (Berkeley) 4/28/95
*
* $Id: pt_tcp.c,v 1.1 1992/05/25 21:43:09 jsp Exp jsp $
*/

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <strings.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 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(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;
       int s_port;
       int priv = 0;
       struct sockaddr_in sain;

       q = strchr(p, '/');
       if (q == 0 || q - p >= sizeof(host))
               return (EINVAL);
       *q = '\0';
       strcpy(host, p);
       p = q + 1;

       q = strchr(p, '/');
       if (q)
               *q = '\0';
       if (strlen(p) >= sizeof(port))
               return (EINVAL);
       strcpy(port, p);
       if (q) {
               p = q + 1;
               if (strcmp(p, "priv") == 0) {
                       if (pcr->pcr_uid == 0)
                               priv = 1;
                       else
                               return (EPERM);
               } else {
                       return (EINVAL);
               }
       }

       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;
       }

       sp = getservbyname(port, "tcp");
       if (sp != 0)
               s_port = sp->s_port;
       else {
               s_port = strtoul(port, &p, 0);
               if (s_port == 0 || *p != '\0')
                       return (EINVAL);
               s_port = htons(s_port);
       }

       memset(&sain, 0, sizeof(sain));
       sain.sin_len = sizeof(sain);
       sain.sin_family = AF_INET;
       sain.sin_port = s_port;

       while (ipp[0]) {
               int so;

               if (priv)
                       so = rresvport((int *) 0);
               else
                       so = socket(AF_INET, SOCK_STREAM, 0);
               if (so < 0) {
                       syslog(LOG_ERR, "socket: %m");
                       return (errno);
               }

               sain.sin_addr = *ipp[0];
               if (connect(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
                       *fdp = so;
                       return (0);
               }
               (void) close(so);

               ipp++;
       }

       return (errno);
}