/* * Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 4. Products derived from this software may not be called "Sudo" nor * may "Sudo" appear in their names without specific prior written * permission from the author. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include <stdio.h> #ifdef STDC_HEADERS #include <stdlib.h> #endif /* STDC_HEADERS */ #ifdef HAVE_UNISTD_H #include <unistd.h> #endif /* HAVE_UNISTD_H */ #ifdef HAVE_STRING_H #include <string.h> #endif /* HAVE_STRING_H */ #ifdef HAVE_STRINGS_H #include <strings.h> #endif /* HAVE_STRINGS_H */ #include <errno.h> #include <sys/types.h> #include <sys/param.h> #include <sys/stat.h> #include "sudo.h" #ifndef STDC_HEADERS extern char *getenv __P((const char *)); extern char *strcpy __P((char *, const char *)); extern int fprintf __P((FILE *, const char *, ...)); extern ssize_t readlink __P((const char *, VOID *, size_t)); extern int stat __P((const char *, struct stat *)); extern int lstat __P((const char *, struct stat *)); #endif /* !STDC_HEADERS */ #ifndef lint static const char rcsid[] = "$Sudo: find_path.c,v 1.95 2000/01/27 04:31:58 millert Exp $"; #endif /* lint */ /* * This function finds the full pathname for a command and * stores it in a statically allocated array, filling in a pointer * to the array. Returns FOUND if the command was found, NOT_FOUND * if it was not found, or NOT_FOUND_DOT if it would have been found * but it is in '.' and IGNORE_DOT is set. */ int find_path(infile, outfile) char *infile; /* file to find */ char **outfile; /* result parameter */ { static char command[MAXPATHLEN]; /* qualified filename */ char *n; /* for traversing path */ char *path = NULL; /* contents of PATH env var */ char *origpath; /* so we can free path later */ char *result = NULL; /* result of path/file lookup */ int checkdot = 0; /* check current dir? */ if (strlen(infile) >= MAXPATHLEN) { (void) fprintf(stderr, "%s: path too long: %s\n", Argv[0], infile); exit(1); } /* * If we were given a fully qualified or relative path * there is no need to look at $PATH. */ if (strchr(infile, '/')) { (void) strcpy(command, infile); if (sudo_goodpath(command)) { *outfile = command; return(FOUND); } else return(NOT_FOUND); } /* * Grab PATH out of the environment (or from the string table * if SECURE_PATH is in effect) and make a local copy. */ if (def_str(I_SECURE_PATH) && !user_is_exempt()) path = def_str(I_SECURE_PATH); else if ((path = getenv("PATH")) == NULL) return(NOT_FOUND); path = estrdup(path); origpath = path; do { if ((n = strchr(path, ':'))) *n = '\0'; /* * Search current dir last if it is in PATH This will miss sneaky * things like using './' or './/' */ if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) { checkdot = 1; path = n + 1; continue; } /* * Resolve the path and exit the loop if found. */ if (strlen(path) + strlen(infile) + 1 >= MAXPATHLEN) { (void) fprintf(stderr, "%s: path too long: %s\n", Argv[0], infile); exit(1); } (void) sprintf(command, "%s/%s", path, infile); if ((result = sudo_goodpath(command))) break; path = n + 1; } while (n); free(origpath); /* * Check current dir if dot was in the PATH */ if (!result && checkdot) { result = sudo_goodpath(infile); if (result && def_flag(I_IGNORE_DOT)) return(NOT_FOUND_DOT); } if (result) { *outfile = result; return(FOUND); } else return(NOT_FOUND); }