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