usr/src/lib/libtnfctl/prb_findexec.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 /*
  23  * Copyright (c) 1994, by Sun Microsytems, Inc.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 /*
  29  * interfaces to find an executable (from libc code)
  30  */
  31
  32 /* Copyright (c) 1988 AT&T */
  33 /* All Rights Reserved   */
  34
  35
  36 #include <unistd.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include "prb_proc_int.h"
  45
  46 static const char *exec_cat(const char *s1, const char *s2, char *si);
  47
  48 prb_status_t
  49 find_executable(const char *name, char *ret_path)
  50 {
  51         const char       *pathstr;
  52         char            fname[PATH_MAX + 2];
  53         const char       *cp;
  54         struct stat      stat_buf;
  55
  56         if (*name == '\0') {
  57                 return (prb_status_map(ENOENT));
  58         }
  59         if ((pathstr = getenv("PATH")) == NULL) {
  60                 if (geteuid() == 0 || getuid() == 0)
  61                         pathstr = "/usr/sbin:/usr/bin";
  62                 else
  63                         pathstr = "/usr/bin:";
  64         }
  65         cp = strchr(name, '/') ? (const char *) "" : pathstr;
  66
  67         do {
  68                 cp = exec_cat(cp, name, fname);
  69                 if (stat(fname, &stat_buf) != -1) {
  70                         /* successful find of the file */
  71                         (void) strncpy(ret_path, fname, PATH_MAX + 2);
  72                         return (PRB_STATUS_OK);
  73                 }
  74         } while (cp);
  75
  76         return (prb_status_map(ENOENT));
  77 }
  78
  79
  80
  81 static const char *
  82 exec_cat(const char *s1, const char *s2, char *si)
  83 {
  84         char               *s;
  85         /* number of characters in s2 */
  86         int                      cnt = PATH_MAX + 1;
  87
  88         s = si;
  89         while (*s1 && *s1 != ':') {
  90                 if (cnt > 0) {
  91                         *s++ = *s1++;
  92                         cnt--;
  93                 } else
  94                         s1++;
  95         }
  96         if (si != s && cnt > 0) {
  97                 *s++ = '/';
  98                 cnt--;
  99         }
 100         while (*s2 && cnt > 0) {
 101                 *s++ = *s2++;
 102                 cnt--;
 103         }
 104         *s = '\0';
 105         return (*s1 ? ++s1 : 0);
 106 }