usr/src/lib/libnls/common/nlsrequest.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 #ident  "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.5.1.1       */
  27
  28 /*
  29  *
  30  * nlsrequest(3):
  31  *
  32  *              Send service request message to remote listener
  33  *              on previously established virtual circuit to remote
  34  *              listener process.
  35  *
  36  *              If an error occurrs, t_errno will contain an error code.
  37  *
  38  *              Setting the external integer "_nlslog" to any non-zero
  39  *              value before calling nlsrequest,  will cause nlsrequest
  40  *              to print debug information on stderr.
  41  *
  42  *              client/server process pairs should include their own
  43  *              initial handshake to insure connectivity.
  44  *
  45  *              This version of nlsrequest includes the
  46  *              service request response message.
  47  */
  48
  49
  50 #include        <stdio.h>
  51 #include        <ctype.h>
  52 #include        <fcntl.h>
  53 #include        <errno.h>
  54 #include        <string.h>
  55 #include        <stdlib.h>
  56 #include        <sys/tiuser.h>
  57 #include        "listen.h"
  58
  59 extern  int _nlslog;            /* non-zero allows use of stderr        */
  60 char *_nlsrmsg = NULL;
  61 static char _nlsbuf[256];
  62
  63
  64 int
  65 nlsrequest(int fd, char *svc_code)
  66 {
  67         int     len, err, flags;
  68         char    buf[256];
  69         char    *p;
  70         int     version, ret;
  71         extern  int t_errno;
  72
  73         t_errno = 0;            /* indicates a 'name' problem   */
  74         buf[0] = 0;
  75
  76         /*
  77          * Validate service code
  78          */
  79
  80         if (!svc_code || !strlen(svc_code) ||
  81             (strlen(svc_code) >= (size_t)SVC_CODE_SZ)) {
  82                 if (_nlslog)
  83                         fprintf(stderr, "nlsrequest: invalid service code format\n");
  84                 return(-1);
  85         }
  86
  87         /*
  88          * send protocol message requesting the service
  89          */
  90
  91         len = sprintf(buf, nls_v2_msg, svc_code)+1;/* inc trailing null */
  92
  93         if (t_snd(fd, buf, len, 0) < len) {
  94                 if (_nlslog)
  95                         t_error("t_snd of listener request message failed");
  96                 return(-1);
  97         }
  98
  99         p = _nlsbuf;
 100         len = 0;
 101
 102         do {
 103                 if (++len > sizeof(_nlsbuf)) {
 104                         if (_nlslog)
 105                                 fprintf(stderr, "nlsrequest: _nlsbuf not large enough\n");
 106                         return(-1);
 107                 }
 108                 if (t_rcv(fd, p, sizeof(char), &flags) != sizeof(char)) {
 109                         if (_nlslog)
 110                                 t_error("t_rcv of listener response msg failed");
 111                         return(-1);
 112                 }
 113
 114         } while (*p++ != '\0');
 115
 116
 117         if ((p = strtok(_nlsbuf, ":")) == NULL)
 118                 goto parsefail;
 119         version = atoi(p);
 120
 121         if ((p = strtok(NULL, ":")) == NULL)
 122                 goto parsefail;
 123         ret = atoi(p);
 124         _nlsrmsg = p + strlen(p) + 1;
 125         if (ret && _nlslog)
 126                 fprintf(stderr, "%s\n", _nlsrmsg); /* debug only */
 127         return(ret);
 128
 129 parsefail:
 130         if (_nlslog)
 131                 fprintf(stderr, "nlsrequest: failed parse of response message\n");
 132         return(-1);
 133 }