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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)pt_tcp.c    8.5 (Berkeley) 4/28/95
  38  *
  39  * $FreeBSD: src/sbin/mount_portal/pt_tcp.c,v 1.9 1999/08/28 00:13:38 peter Exp $
  40  * $DragonFly: src/sbin/mount_portal/pt_tcp.c,v 1.5 2005/11/06 12:36:40 swildner Exp $
  41  */
  42
  43 #include <errno.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <sys/types.h>
  48 #include <sys/param.h>
  49 #include <sys/syslog.h>
  50 #include <sys/socket.h>
  51 #include <netinet/in.h>
  52 #include <arpa/inet.h>
  53 #include <netdb.h>
  54
  55 #include "portald.h"
  56
  57 /*
  58  * Key will be tcp/host/port[/"priv"]
  59  * Create a TCP socket connected to the
  60  * requested host and port.
  61  * Some trailing suffix values have special meanings.
  62  * An unrecognized suffix is an error.
  63  */
  64 int
  65 portal_tcp(struct portal_cred *pcr, char *key, char **v, int kso, int *fdp)
  66 {
  67         char host[MAXHOSTNAMELEN];
  68         char port[MAXHOSTNAMELEN];
  69         char *p = key + (v[1] ? strlen(v[1]) : 0);
  70         char *q;
  71         struct hostent *hp;
  72         struct servent *sp;
  73         struct in_addr **ipp;
  74         struct in_addr *ip[2];
  75         struct in_addr ina;
  76         u_short s_port;
  77         int priv = 0;
  78         struct sockaddr_in sain;
  79
  80         q = strchr(p, '/');
  81         if (q == 0 || q - p >= sizeof(host))
  82                 return (EINVAL);
  83         *q = '\0';
  84         strcpy(host, p);
  85         p = q + 1;
  86
  87         q = strchr(p, '/');
  88         if (q)
  89                 *q = '\0';
  90         if (strlen(p) >= sizeof(port))
  91                 return (EINVAL);
  92         strcpy(port, p);
  93         if (q) {
  94                 p = q + 1;
  95                 if (strcmp(p, "priv") == 0) {
  96                         if (pcr->pcr_uid == 0)
  97                                 priv = 1;
  98                         else
  99                                 return (EPERM);
 100                 } else {
 101                         return (EINVAL);
 102                 }
 103         }
 104
 105         hp = gethostbyname(host);
 106         if (hp != 0) {
 107                 ipp = (struct in_addr **) hp->h_addr_list;
 108         } else {
 109                 ina.s_addr = inet_addr(host);
 110                 if (ina.s_addr == INADDR_NONE)
 111                         return (EINVAL);
 112                 ip[0] = &ina;
 113                 ip[1] = 0;
 114                 ipp = ip;
 115         }
 116 #ifdef DEBUG
 117         printf ("inet address for %s is %s\n", host, inet_ntoa(*ipp[0]));
 118 #endif
 119
 120         sp = getservbyname(port, "tcp");
 121         if (sp != NULL) {
 122                 s_port = (u_short)sp->s_port;
 123         } else {
 124                 s_port = strtoul(port, &p, 0);
 125                 if (s_port == 0 || *p != '\0')
 126                         return (EINVAL);
 127                 s_port = htons(s_port);
 128         }
 129 #ifdef DEBUG
 130         printf ("port number for %s is %d\n", port, (int)ntohs(s_port));
 131 #endif
 132
 133         memset(&sain, 0, sizeof(sain));
 134         sain.sin_len = sizeof(sain);
 135         sain.sin_family = AF_INET;
 136         sain.sin_port = s_port;
 137
 138         while (ipp[0]) {
 139                 int so;
 140
 141                 if (priv)
 142                         so = rresvport(NULL);
 143                 else
 144                         so = socket(AF_INET, SOCK_STREAM, 0);
 145                 if (so < 0) {
 146                         syslog(LOG_ERR, "socket: %m");
 147                         return (errno);
 148                 }
 149
 150                 sain.sin_addr = *ipp[0];
 151                 if (connect(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
 152                         *fdp = so;
 153                         return (0);
 154                 }
 155                 close(so);
 156
 157                 ipp++;
 158         }
 159
 160         return (errno);
 161 }