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