136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include "sudo.h"
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/*
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* This function finds the full pathname for a command and
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* stores it in a statically allocated array, filling in a pointer
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* to the array. Returns FOUND if the command was found, NOT_FOUND
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* if it was not found, or NOT_FOUND_DOT if it would have been found
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* but it is in '.' and IGNORE_DOT is set.
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*/
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int
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find_path(infile, outfile, sbp, path)
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char *infile; /* file to find */
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char **outfile; /* result parameter */
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struct stat *sbp; /* stat result parameter */
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char *path; /* path to search */
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{
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static char command[PATH_MAX]; /* qualified filename */
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char *n; /* for traversing path */
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char *origpath; /* so we can free path later */
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char *result = NULL; /* result of path/file lookup */
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int checkdot = 0; /* check current dir? */
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int len; /* length parameter */
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if (strlen(infile) >= PATH_MAX)
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errorx(1, "%s: File name too long", infile);
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/*
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* If we were given a fully qualified or relative path
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* there is no need to look at $PATH.
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*/
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if (strchr(infile, '/')) {
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strlcpy(command, infile, sizeof(command)); /* paranoia */
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if (sudo_goodpath(command, sbp)) {
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*outfile = command;
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return(FOUND);
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} else
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return(NOT_FOUND);
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}
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/* Use PATH passed in unless SECURE_PATH is in effect. */
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if (def_secure_path && !user_is_exempt())
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path = def_secure_path;
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else if (path == NULL)
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return(NOT_FOUND);
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path = estrdup(path);
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origpath = path;
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do {
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if ((n = strchr(path, ':')))
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*n = '\0';
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/*
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* Search current dir last if it is in PATH This will miss sneaky
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* things like using './' or './/'
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*/
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if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) {
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checkdot = 1;
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path = n + 1;
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continue;
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}
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/*
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* Resolve the path and exit the loop if found.
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*/
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len = snprintf(command, sizeof(command), "%s/%s", path, infile);
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if (len <= 0 || len >= sizeof(command))
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errorx(1, "%s: File name too long", infile);
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if ((result = sudo_goodpath(command, sbp)))
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break;
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path = n + 1;
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} while (n);
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efree(origpath);
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/*
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* Check current dir if dot was in the PATH
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*/
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if (!result && checkdot) {
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result = sudo_goodpath(infile, sbp);
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if (result && def_ignore_dot)
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return(NOT_FOUND_DOT);
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}
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if (result) {
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*outfile = result;
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return(FOUND);
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} else
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return(NOT_FOUND);
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}
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