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  *
  27  * nlsrequest(3):
  28  *
  29  *              Send service request message to remote listener
  30  *              on previously established virtual circuit to remote
  31  *              listener process.
  32  *
  33  *              If an error occurrs, t_errno will contain an error code.
  34  *
  35  *              Setting the external integer "_nlslog" to any non-zero
  36  *              value before calling nlsrequest,  will cause nlsrequest
  37  *              to print debug information on stderr.
  38  *
  39  *              client/server process pairs should include their own
  40  *              initial handshake to insure connectivity.
  41  *
  42  *              This version of nlsrequest includes the
  43  *              service request response message.
  44  */
  45
  46
  47 #include        <stdio.h>
  48 #include        <ctype.h>
  49 #include        <fcntl.h>
  50 #include        <errno.h>
  51 #include        <string.h>
  52 #include        <stdlib.h>
  53 #include        <sys/tiuser.h>
  54 #include        "listen.h"
  55
  56 extern  int _nlslog;            /* non-zero allows use of stderr        */
  57 char *_nlsrmsg = NULL;
  58 static char _nlsbuf[256];
  59
  60
  61 int
  62 nlsrequest(int fd, char *svc_code)
  63 {
  64         int     len, err, flags;
  65         char    buf[256];
  66         char    *p;
  67         int     ret;
  68         extern  int t_errno;
  69
  70         t_errno = 0;            /* indicates a 'name' problem   */
  71         buf[0] = 0;
  72
  73         /*
  74          * Validate service code
  75          */
  76
  77         if (!svc_code || !strlen(svc_code) ||
  78             (strlen(svc_code) >= (size_t)SVC_CODE_SZ)) {
  79                 if (_nlslog) {
  80                         fprintf(stderr,
  81                             "nlsrequest: invalid service code format\n");
  82                 }
  83                 return (-1);
  84         }
  85
  86         /*
  87          * send protocol message requesting the service
  88          */
  89
  90         len = sprintf(buf, nls_v2_msg, svc_code) + 1; /* inc trailing null */
  91
  92         if (t_snd(fd, buf, len, 0) < len) {
  93                 if (_nlslog)
  94                         t_error("t_snd of listener request message failed");
  95                 return (-1);
  96         }
  97
  98         p = _nlsbuf;
  99         len = 0;
 100
 101         do {
 102                 if (++len > sizeof (_nlsbuf)) {
 103                         if (_nlslog) {
 104                                 fprintf(stderr,
 105                                     "nlsrequest: _nlsbuf not large enough\n");
 106                         }
 107                         return (-1);
 108                 }
 109                 if (t_rcv(fd, p, sizeof (char), &flags) != sizeof (char)) {
 110                         if (_nlslog) {
 111                                 t_error("t_rcv of listener response msg "
 112                                     "failed");
 113                         }
 114                         return (-1);
 115                 }
 116
 117         } while (*p++ != '\0');
 118
 119
 120         if ((p = strtok(_nlsbuf, ":")) == NULL)
 121                 goto parsefail;
 122
 123         /*
 124          * We ignore the version number here as we do not have any use for it.
 125          * Previous versions of the code looked at it by calling atoi() on it,
 126          * which did not mutate the actual string and did not use it.
 127          */
 128
 129         if ((p = strtok(NULL, ":")) == NULL)
 130                 goto parsefail;
 131         ret = atoi(p);
 132         _nlsrmsg = p + strlen(p) + 1;
 133         if (ret && _nlslog)
 134                 fprintf(stderr, "%s\n", _nlsrmsg); /* debug only */
 135         return (ret);
 136
 137 parsefail:
 138         if (_nlslog) {
 139                 fprintf(stderr,
 140                     "nlsrequest: failed parse of response message\n");
 141         }
 142         return (-1);
 143 }