contrib/tcp_wrappers/tli-sequent.c

   1  /*
   2   * Warning - this relies heavily on the TLI implementation in PTX 2.X and will
   3   * probably not work under PTX 4.
   4   *
   5   * Author: Tim Wright, Sequent Computer Systems Ltd., UK.
   6   *
   7   * Modified slightly to conform to the new internal interfaces - Wietse
   8   */
   9
  10 #ifndef lint
  11 static char sccsid[] = "@(#) tli-sequent.c 1.1 94/12/28 17:42:51";
  12 #endif
  13
  14 #ifdef TLI_SEQUENT
  15
  16 /* System libraries. */
  17
  18 #include <sys/types.h>
  19 #include <sys/param.h>
  20 #include <sys/stat.h>
  21 #include <sys/tiuser.h>
  22 #include <sys/stream.h>
  23 #include <sys/stropts.h>
  24 #include <sys/tihdr.h>
  25 #include <sys/timod.h>
  26 #include <sys/socket.h>
  27 #include <netinet/in.h>
  28 #include <stdio.h>
  29 #include <syslog.h>
  30 #include <errno.h>
  31 #include <string.h>
  32
  33 extern int errno;
  34 extern char *sys_errlist[];
  35 extern int sys_nerr;
  36 extern int t_errno;
  37 extern char *t_errlist[];
  38 extern int t_nerr;
  39
  40 /* Local stuff. */
  41
  42 #include "tcpd.h"
  43 #include "tli-sequent.h"
  44
  45 /* Forward declarations. */
  46
  47 static char *tli_error();
  48 static void tli_sink();
  49
  50 /* tli_host - determine endpoint info */
  51
  52 int     tli_host(request)
  53 struct request_info *request;
  54 {
  55     static struct sockaddr_in client;
  56     static struct sockaddr_in server;
  57     struct _ti_user *tli_state_ptr;
  58     union T_primitives *TSI_prim_ptr;
  59     struct strpeek peek;
  60     int     len;
  61
  62     /*
  63      * Use DNS and socket routines for name and address conversions.
  64      */
  65
  66     sock_methods(request);
  67
  68     /*
  69      * Find out the client address using getpeerinaddr(). This call is the
  70      * TLI equivalent to getpeername() under Dynix/ptx.
  71      */
  72
  73     len = sizeof(client);
  74     t_sync(request->fd);
  75     if (getpeerinaddr(request->fd, &client, len) < 0) {
  76         tcpd_warn("can't get client address: %s", tli_error());
  77         return;
  78     }
  79     request->client->sin = &client;
  80
  81     /* Call TLI utility routine to get information on endpoint */
  82     if ((tli_state_ptr = _t_checkfd(request->fd)) == NULL)
  83         return;
  84
  85     if (tli_state_ptr->ti_servtype == T_CLTS) {
  86         /* UDP - may need to get address the hard way */
  87         if (client.sin_addr.s_addr == 0) {
  88             /* The UDP endpoint is not connected so we didn't get the */
  89             /* remote address - get it the hard way ! */
  90
  91             /* Look at the control part of the top message on the stream */
  92             /* we don't want to remove it from the stream so we use I_PEEK */
  93             peek.ctlbuf.maxlen = tli_state_ptr->ti_ctlsize;
  94             peek.ctlbuf.len = 0;
  95             peek.ctlbuf.buf = tli_state_ptr->ti_ctlbuf;
  96             /* Don't even look at the data */
  97             peek.databuf.maxlen = -1;
  98             peek.databuf.len = 0;
  99             peek.databuf.buf = 0;
 100             peek.flags = 0;
 101
 102             switch (ioctl(request->fd, I_PEEK, &peek)) {
 103             case -1:
 104                 tcpd_warn("can't peek at endpoint: %s", tli_error());
 105                 return;
 106             case 0:
 107                 /* No control part - we're hosed */
 108                 tcpd_warn("can't get UDP info: %s", tli_error());
 109                 return;
 110             default:
 111                 /* FALL THROUGH */
 112                 ;
 113             }
 114             /* Can we even check the PRIM_type ? */
 115             if (peek.ctlbuf.len < sizeof(long)) {
 116                 tcpd_warn("UDP control info garbage");
 117                 return;
 118             }
 119             TSI_prim_ptr = (union T_primitives *) peek.ctlbuf.buf;
 120             if (TSI_prim_ptr->type != T_UNITDATA_IND) {
 121                 tcpd_warn("wrong type for UDP control info");
 122                 return;
 123             }
 124             /* Validate returned unitdata indication packet */
 125             if ((peek.ctlbuf.len < sizeof(struct T_unitdata_ind)) ||
 126                 ((TSI_prim_ptr->unitdata_ind.OPT_length != 0) &&
 127                  (peek.ctlbuf.len <
 128                   TSI_prim_ptr->unitdata_ind.OPT_length +
 129                   TSI_prim_ptr->unitdata_ind.OPT_offset))) {
 130                 tcpd_warn("UDP control info garbaged");
 131                 return;
 132             }
 133             /* Extract the address */
 134             memcpy(&client,
 135                    peek.ctlbuf.buf + TSI_prim_ptr->unitdata_ind.SRC_offset,
 136                    TSI_prim_ptr->unitdata_ind.SRC_length);
 137         }
 138         request->sink = tli_sink;
 139     }
 140     if (getmyinaddr(request->fd, &server, len) < 0)
 141         tcpd_warn("can't get local address: %s", tli_error());
 142     else
 143         request->server->sin = &server;
 144 }
 145
 146 /* tli_error - convert tli error number to text */
 147
 148 static char *tli_error()
 149 {
 150     static char buf[40];
 151
 152     if (t_errno != TSYSERR) {
 153         if (t_errno < 0 || t_errno >= t_nerr) {
 154             sprintf(buf, "Unknown TLI error %d", t_errno);
 155             return (buf);
 156         } else {
 157             return (t_errlist[t_errno]);
 158         }
 159     } else {
 160         if (errno < 0 || errno >= sys_nerr) {
 161             sprintf(buf, "Unknown UNIX error %d", errno);
 162             return (buf);
 163         } else {
 164             return (sys_errlist[errno]);
 165         }
 166     }
 167 }
 168
 169 /* tli_sink - absorb unreceived datagram */
 170
 171 static void tli_sink(fd)
 172 int     fd;
 173 {
 174     struct t_unitdata *unit;
 175     int     flags;
 176
 177     /*
 178      * Something went wrong. Absorb the datagram to keep inetd from looping.
 179      * Allocate storage for address, control and data. If that fails, sleep
 180      * for a couple of seconds in an attempt to keep inetd from looping too
 181      * fast.
 182      */
 183
 184     if ((unit = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ALL)) == 0) {
 185         tcpd_warn("t_alloc: %s", tli_error());
 186         sleep(5);
 187     } else {
 188         (void) t_rcvudata(fd, unit, &flags);
 189         t_free((void *) unit, T_UNITDATA);
 190     }
 191 }
 192
 193 #endif /* TLI_SEQUENT */