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 */ 193