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