sbin/mount_portal/pt_tcp.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software donated to Berkeley by
   7  * Jan-Simon Pendry.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)pt_tcp.c    8.5 (Berkeley) 4/28/95
  34  *
  35  * $FreeBSD: src/sbin/mount_portal/pt_tcp.c,v 1.9 1999/08/28 00:13:38 peter Exp $
  36  */
  37
  38 #include <errno.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42 #include <sys/types.h>
  43 #include <sys/param.h>
  44 #include <sys/syslog.h>
  45 #include <sys/socket.h>
  46 #include <netinet/in.h>
  47 #include <arpa/inet.h>
  48 #include <netdb.h>
  49
  50 #include "portald.h"
  51
  52 /*
  53  * Key will be tcp/host/port[/"priv"]
  54  * Create a TCP socket connected to the
  55  * requested host and port.
  56  * Some trailing suffix values have special meanings.
  57  * An unrecognized suffix is an error.
  58  */
  59 int
  60 portal_tcp(struct portal_cred *pcr, char *key, char **v, int kso __unused,
  61     int *fdp)
  62 {
  63         char host[MAXHOSTNAMELEN];
  64         char port[MAXHOSTNAMELEN];
  65         char *p = key + (v[1] ? strlen(v[1]) : 0);
  66         char *q;
  67         struct hostent *hp;
  68         struct servent *sp;
  69         struct in_addr **ipp;
  70         struct in_addr *ip[2];
  71         struct in_addr ina;
  72         u_short s_port;
  73         int priv = 0;
  74         struct sockaddr_in sain;
  75
  76         q = strchr(p, '/');
  77         if (q == NULL || (size_t)(q - p) >= sizeof(host))
  78                 return (EINVAL);
  79         *q = '\0';
  80         strcpy(host, p);
  81         p = q + 1;
  82
  83         q = strchr(p, '/');
  84         if (q)
  85                 *q = '\0';
  86         if (strlen(p) >= sizeof(port))
  87                 return (EINVAL);
  88         strcpy(port, p);
  89         if (q) {
  90                 p = q + 1;
  91                 if (strcmp(p, "priv") == 0) {
  92                         if (pcr->pcr_uid == 0)
  93                                 priv = 1;
  94                         else
  95                                 return (EPERM);
  96                 } else {
  97                         return (EINVAL);
  98                 }
  99         }
 100
 101         hp = gethostbyname(host);
 102         if (hp != NULL) {
 103                 ipp = (struct in_addr **) hp->h_addr_list;
 104         } else {
 105                 ina.s_addr = inet_addr(host);
 106                 if (ina.s_addr == INADDR_NONE)
 107                         return (EINVAL);
 108                 ip[0] = &ina;
 109                 ip[1] = NULL;
 110                 ipp = ip;
 111         }
 112 #ifdef DEBUG
 113         printf ("inet address for %s is %s\n", host, inet_ntoa(*ipp[0]));
 114 #endif
 115
 116         sp = getservbyname(port, "tcp");
 117         if (sp != NULL) {
 118                 s_port = (u_short)sp->s_port;
 119         } else {
 120                 s_port = strtoul(port, &p, 0);
 121                 if (s_port == 0 || *p != '\0')
 122                         return (EINVAL);
 123                 s_port = htons(s_port);
 124         }
 125 #ifdef DEBUG
 126         printf ("port number for %s is %d\n", port, (int)ntohs(s_port));
 127 #endif
 128
 129         memset(&sain, 0, sizeof(sain));
 130         sain.sin_len = sizeof(sain);
 131         sain.sin_family = AF_INET;
 132         sain.sin_port = s_port;
 133
 134         while (ipp[0]) {
 135                 int so;
 136
 137                 if (priv)
 138                         so = rresvport(NULL);
 139                 else
 140                         so = socket(AF_INET, SOCK_STREAM, 0);
 141                 if (so < 0) {
 142                         syslog(LOG_ERR, "socket: %m");
 143                         return (errno);
 144                 }
 145
 146                 sain.sin_addr = *ipp[0];
 147                 if (connect(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
 148                         *fdp = so;
 149                         return (0);
 150                 }
 151                 close(so);
 152
 153                 ipp++;
 154         }
 155
 156         return (errno);
 157 }