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  * $DragonFly: src/sbin/mount_portal/pt_tcplisten.c,v 1.5 2005/11/06 12:36:40 swildner Exp $
  42  * pt_tcp.c,v 1.1.1.1 1994/05/26 06:34:34 rgrimes Exp
  43  */
  44
  45 #include <stdio.h>
  46 #include <unistd.h>
  47 #include <stdlib.h>
  48 #include <errno.h>
  49 #include <strings.h>
  50 #include <sys/types.h>
  51 #include <sys/param.h>
  52 #include <sys/syslog.h>
  53 #include <sys/socket.h>
  54 #include <netinet/in.h>
  55 #include <arpa/inet.h>
  56 #include <netdb.h>
  57
  58 #include "portald.h"
  59
  60 /*
  61  * Key will be tcplisten/host/port
  62  *
  63  * Create a TCP socket bound to the requested host and port.
  64  * If the host is "ANY" the receving address will be set to INADDR_ANY.
  65  * If the port is 0 the caller must find out the returned port number
  66  * using a call to getsockname.
  67  *
  68  * XXX!  The owner of the socket will be root rather then the user.  This
  69  *       may cause remote auth (identd) to return unexpected results.
  70  *
  71  */
  72 int
  73 portal_tcplisten(struct portal_cred *pcr, char *key, char **v, int kso,
  74                  int *fdp)
  75 {
  76        char host[MAXHOSTNAMELEN];
  77        char port[MAXHOSTNAMELEN];
  78        char *p = key + (v[1] ? strlen(v[1]) : 0);
  79        char *q;
  80        struct hostent *hp;
  81        struct servent *sp;
  82        struct in_addr **ipp = NULL;
  83        struct in_addr *ip[2];
  84        struct in_addr ina;
  85        u_short s_port;
  86        int any = 0;
  87        struct sockaddr_in sain;
  88
  89        q = strchr(p, '/');
  90        if (q == 0 || q - p >= sizeof(host))
  91                return (EINVAL);
  92        *q = '\0';
  93        snprintf(host, sizeof(host), "%s", p);
  94        p = q + 1;
  95
  96        q = strchr(p, '/');
  97        if (q)
  98                *q = '\0';
  99        if (strlen(p) >= sizeof(port))
 100                return (EINVAL);
 101        snprintf(port, sizeof(port), "%s", p);
 102
 103        if (strcmp(host, "ANY") == 0) {
 104                any = 1;
 105        } else {
 106                hp = gethostbyname(host);
 107                if (hp != 0) {
 108                        ipp = (struct in_addr **) hp->h_addr_list;
 109                } else {
 110                        ina.s_addr = inet_addr(host);
 111                        if (ina.s_addr == INADDR_NONE)
 112                                return (EINVAL);
 113                        ip[0] = &ina;
 114                        ip[1] = 0;
 115                        ipp = ip;
 116                }
 117        }
 118 #ifdef DEBUG
 119        if (any)
 120                printf("INADDR_ANY to be used for hostname\n");
 121        else
 122                printf("inet address for %s is %s\n", host, inet_ntoa(*ipp[0]));
 123 #endif
 124
 125        sp = getservbyname(port, "tcp");
 126        if (sp != NULL) {
 127                s_port = (u_short) sp->s_port;
 128         } else {
 129                s_port = strtoul(port, &p, 0);
 130                if (*p != '\0')
 131                        return (EINVAL);
 132                s_port = htons(s_port);
 133        }
 134        if ((ntohs(s_port) != 0) &&
 135            (ntohs(s_port) <= IPPORT_RESERVED) &&
 136            (pcr->pcr_uid != 0))
 137                return (EPERM);
 138 #ifdef DEBUG
 139        printf("port number for %s is %d\n", port, ntohs(s_port));
 140 #endif
 141
 142        memset(&sain, 0, sizeof(sain));
 143        sain.sin_len = sizeof(sain);
 144        sain.sin_family = AF_INET;
 145        sain.sin_port = s_port;
 146
 147        if (any) {
 148                int so;
 149                int sock;
 150
 151                so = socket(AF_INET, SOCK_STREAM, 0);
 152                if (so < 0) {
 153                        syslog(LOG_ERR, "socket: %m");
 154                        return (errno);
 155                }
 156
 157                sain.sin_addr.s_addr = INADDR_ANY;
 158                if (bind(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
 159                        listen(so, 1);
 160                        if ((sock = accept(so, (struct sockaddr *)0, (int *)0)) == -1) {
 161                                syslog(LOG_ERR, "accept: %m");
 162                                close(so);
 163                                return (errno);
 164                        }
 165                        *fdp = sock;
 166                        close(so);
 167                        return (0);
 168                }
 169                syslog(LOG_ERR, "bind: %m");
 170                close(so);
 171                return (errno);
 172        }
 173
 174        while (ipp[0]) {
 175                int so;
 176                int sock;
 177
 178                so = socket(AF_INET, SOCK_STREAM, 0);
 179                if (so < 0) {
 180                        syslog(LOG_ERR, "socket: %m");
 181                        return (errno);
 182                }
 183
 184                sain.sin_addr = *ipp[0];
 185                if (bind(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
 186                        listen(so, 1);
 187                        if ((sock = accept(so, (struct sockaddr *)0, (int *)0)) == -1) {
 188                                syslog(LOG_ERR, "accept: %m");
 189                                close(so);
 190                                return (errno);
 191                        }
 192                        *fdp = sock;
 193                        close(so);
 194                        return (0);
 195                }
 196                close(so);
 197
 198                ipp++;
 199        }
 200
 201        syslog(LOG_ERR, "bind: %m");
 202        return (errno);
 203
 204 }