sbin/mount_portal/pt_tcplisten.c

   1 /*
   2  * Copyright (c) 1992, 1993
   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  * Modified by Duncan Barclay.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *  This product includes software developed by the University of
  22  *  California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *  @(#)pt_tcp.c  8.3 (Berkeley) 3/27/94
  40  *
  41  * pt_tcp.c,v 1.1.1.1 1994/05/26 06:34:34 rgrimes Exp
  42  */
  43
  44 #include <stdio.h>
  45 #include <unistd.h>
  46 #include <stdlib.h>
  47 #include <errno.h>
  48 #include <string.h>
  49 #include <sys/types.h>
  50 #include <sys/param.h>
  51 #include <sys/syslog.h>
  52 #include <sys/socket.h>
  53 #include <netinet/in.h>
  54 #include <arpa/inet.h>
  55 #include <netdb.h>
  56
  57 #include "portald.h"
  58
  59 /*
  60  * Key will be tcplisten/host/port
  61  *
  62  * Create a TCP socket bound to the requested host and port.
  63  * If the host is "ANY" the receving address will be set to INADDR_ANY.
  64  * If the port is 0 the caller must find out the returned port number
  65  * using a call to getsockname.
  66  *
  67  * XXX!  The owner of the socket will be root rather then the user.  This
  68  *       may cause remote auth (identd) to return unexpected results.
  69  *
  70  */
  71 int
  72 portal_tcplisten(struct portal_cred *pcr, char *key, char **v,
  73     int kso __unused, int *fdp)
  74 {
  75        char host[MAXHOSTNAMELEN];
  76        char port[MAXHOSTNAMELEN];
  77        char *p = key + (v[1] ? strlen(v[1]) : 0);
  78        char *q;
  79        struct hostent *hp;
  80        struct servent *sp;
  81        struct in_addr **ipp = NULL;
  82        struct in_addr *ip[2];
  83        struct in_addr ina;
  84        u_short s_port;
  85        int any = 0;
  86        struct sockaddr_in sain;
  87
  88        q = strchr(p, '/');
  89        if (q == NULL || (size_t)(q - p) >= sizeof(host))
  90                return (EINVAL);
  91        *q = '\0';
  92        snprintf(host, sizeof(host), "%s", p);
  93        p = q + 1;
  94
  95        q = strchr(p, '/');
  96        if (q)
  97                *q = '\0';
  98        if (strlen(p) >= sizeof(port))
  99                return (EINVAL);
 100        snprintf(port, sizeof(port), "%s", p);
 101
 102        if (strcmp(host, "ANY") == 0) {
 103                any = 1;
 104        } else {
 105                hp = gethostbyname(host);
 106                if (hp != NULL) {
 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] = NULL;
 114                        ipp = ip;
 115                }
 116        }
 117 #ifdef DEBUG
 118        if (any)
 119                printf("INADDR_ANY to be used for hostname\n");
 120        else
 121                printf("inet address for %s is %s\n", host, inet_ntoa(*ipp[0]));
 122 #endif
 123
 124        sp = getservbyname(port, "tcp");
 125        if (sp != NULL) {
 126                s_port = (u_short) sp->s_port;
 127         } else {
 128                s_port = strtoul(port, &p, 0);
 129                if (*p != '\0')
 130                        return (EINVAL);
 131                s_port = htons(s_port);
 132        }
 133        if ((ntohs(s_port) != 0) &&
 134            (ntohs(s_port) <= IPPORT_RESERVED) &&
 135            (pcr->pcr_uid != 0))
 136                return (EPERM);
 137 #ifdef DEBUG
 138        printf("port number for %s is %d\n", port, ntohs(s_port));
 139 #endif
 140
 141        memset(&sain, 0, sizeof(sain));
 142        sain.sin_len = sizeof(sain);
 143        sain.sin_family = AF_INET;
 144        sain.sin_port = s_port;
 145
 146        if (any) {
 147                int so;
 148                int sock;
 149
 150                so = socket(AF_INET, SOCK_STREAM, 0);
 151                if (so < 0) {
 152                        syslog(LOG_ERR, "socket: %m");
 153                        return (errno);
 154                }
 155
 156                sain.sin_addr.s_addr = INADDR_ANY;
 157                if (bind(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
 158                        listen(so, 1);
 159                        if ((sock = accept(so, NULL, NULL)) == -1) {
 160                                syslog(LOG_ERR, "accept: %m");
 161                                close(so);
 162                                return (errno);
 163                        }
 164                        *fdp = sock;
 165                        close(so);
 166                        return (0);
 167                }
 168                syslog(LOG_ERR, "bind: %m");
 169                close(so);
 170                return (errno);
 171        }
 172
 173        while (ipp[0]) {
 174                int so;
 175                int sock;
 176
 177                so = socket(AF_INET, SOCK_STREAM, 0);
 178                if (so < 0) {
 179                        syslog(LOG_ERR, "socket: %m");
 180                        return (errno);
 181                }
 182
 183                sain.sin_addr = *ipp[0];
 184                if (bind(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
 185                        listen(so, 1);
 186                        if ((sock = accept(so, NULL, NULL)) == -1) {
 187                                syslog(LOG_ERR, "accept: %m");
 188                                close(so);
 189                                return (errno);
 190                        }
 191                        *fdp = sock;
 192                        close(so);
 193                        return (0);
 194                }
 195                close(so);
 196
 197                ipp++;
 198        }
 199
 200        syslog(LOG_ERR, "bind: %m");
 201        return (errno);
 202
 203 }