Annotation of embedaddon/sudo/plugins/sudoers/find_path.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 1996, 1998-2005, 2010-2011
3: * Todd C. Miller <Todd.Miller@courtesan.com>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: *
17: * Sponsored in part by the Defense Advanced Research Projects
18: * Agency (DARPA) and Air Force Research Laboratory, Air Force
19: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20: */
21:
22: #include <config.h>
23:
24: #include <sys/types.h>
25: #include <sys/param.h>
26: #include <sys/stat.h>
27: #include <stdio.h>
28: #ifdef STDC_HEADERS
29: # include <stdlib.h>
30: # include <stddef.h>
31: #else
32: # ifdef HAVE_STDLIB_H
33: # include <stdlib.h>
34: # endif
35: #endif /* STDC_HEADERS */
36: #ifdef HAVE_STRING_H
37: # include <string.h>
38: #endif /* HAVE_STRING_H */
39: #ifdef HAVE_STRINGS_H
40: # include <strings.h>
41: #endif /* HAVE_STRINGS_H */
42: #ifdef HAVE_UNISTD_H
43: # include <unistd.h>
44: #endif /* HAVE_UNISTD_H */
45: #include <errno.h>
46:
47: #include "sudoers.h"
48:
49: /*
50: * This function finds the full pathname for a command and
51: * stores it in a statically allocated array, filling in a pointer
52: * to the array. Returns FOUND if the command was found, NOT_FOUND
53: * if it was not found, or NOT_FOUND_DOT if it would have been found
54: * but it is in '.' and IGNORE_DOT is set.
55: */
56: int
57: find_path(char *infile, char **outfile, struct stat *sbp, char *path,
58: int ignore_dot)
59: {
60: static char command[PATH_MAX]; /* qualified filename */
61: char *n; /* for traversing path */
62: char *origpath; /* so we can free path later */
63: char *result = NULL; /* result of path/file lookup */
64: int checkdot = 0; /* check current dir? */
65: int len; /* length parameter */
66:
67: if (strlen(infile) >= PATH_MAX)
68: errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
69:
70: /*
71: * If we were given a fully qualified or relative path
72: * there is no need to look at $PATH.
73: */
74: if (strchr(infile, '/')) {
75: strlcpy(command, infile, sizeof(command)); /* paranoia */
76: if (sudo_goodpath(command, sbp)) {
77: *outfile = command;
78: return FOUND;
79: } else
80: return NOT_FOUND;
81: }
82:
83: if (path == NULL)
84: return NOT_FOUND;
85: path = estrdup(path);
86: origpath = path;
87:
88: do {
89: if ((n = strchr(path, ':')))
90: *n = '\0';
91:
92: /*
93: * Search current dir last if it is in PATH This will miss sneaky
94: * things like using './' or './/'
95: */
96: if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) {
97: checkdot = 1;
98: path = n + 1;
99: continue;
100: }
101:
102: /*
103: * Resolve the path and exit the loop if found.
104: */
105: len = snprintf(command, sizeof(command), "%s/%s", path, infile);
106: if (len <= 0 || len >= sizeof(command))
107: errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
108: if ((result = sudo_goodpath(command, sbp)))
109: break;
110:
111: path = n + 1;
112:
113: } while (n);
114: efree(origpath);
115:
116: /*
117: * Check current dir if dot was in the PATH
118: */
119: if (!result && checkdot) {
120: len = snprintf(command, sizeof(command), "./%s", infile);
121: if (len <= 0 || len >= sizeof(command))
122: errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
123: result = sudo_goodpath(command, sbp);
124: if (result && ignore_dot)
125: return NOT_FOUND_DOT;
126: }
127:
128: if (result) {
129: *outfile = result;
130: return FOUND;
131: } else
132: return NOT_FOUND;
133: }
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