1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include "includes.h"
RCSID("$OpenBSD: tildexpand.c,v 1.13 2002/06/23 03:25:50 deraadt Exp $");
#include <libgen.h>
#include "xmalloc.h"
#include "log.h"
#include "tildexpand.h"
/*
* Expands tildes in the file name. Returns data allocated by xmalloc.
* Warning: this calls getpw*.
*/
char *
tilde_expand_filename(const char *filename, uid_t my_uid)
{
const char *cp;
uint_t userlen;
char *expanded;
struct passwd *pw;
char *pw_dir;
char user[100];
int len;
/* Return immediately if no tilde. */
if (filename[0] != '~')
return (xstrdup(filename));
/* Skip the tilde. */
filename++;
/* Find where the username ends. */
cp = strchr(filename, '/');
if (cp)
userlen = cp - filename; /* Something after username. */
else
userlen = strlen(filename); /* Nothing after username. */
/* This is the ~/xyz case with no ~username specification. */
if (userlen == 0)
pw = getpwuid(my_uid);
else {
/* Tilde refers to someone elses home directory. */
if (userlen > sizeof (user) - 1)
fatal("User name after tilde too long.");
memcpy(user, filename, userlen);
user[userlen] = 0;
pw = getpwnam(user);
}
/* Use the HOME variable now. */
if (pw == NULL) {
debug("User account's password entry not found, trying to use "
"the HOME variable.");
if ((pw_dir = getenv("HOME")) == NULL) {
fatal("User account's password entry not found and "
"the HOME variable not set.");
}
} else {
pw_dir = pw->pw_dir;
}
/* If referring to someones home directory, return it now. */
if (cp == NULL) {
/* Only home directory specified */
return (xstrdup(pw_dir));
}
/* Build a path combining the specified directory and path. */
len = strlen(pw_dir) + strlen(cp + 1) + 2;
if (len > MAXPATHLEN)
fatal("Home directory too long (%d > %d)", len - 1,
MAXPATHLEN - 1);
expanded = xmalloc(len);
snprintf(expanded, len, "%s%s%s", pw_dir,
strcmp(pw_dir, "/") ? "/" : "", cp + 1);
return (expanded);
}
|
