blob: 8ee551f13fec6f43fa0cccdd3fcca740ccca7652 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * Created: Wed Jul 12 01:07:36 1995 ylo
6 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10007
8#include "includes.h"
Damien Miller5428f641999-11-25 11:54:57 +11009RCSID("$Id: tildexpand.c,v 1.3 1999/11/25 00:54:59 damien Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100010
11#include "xmalloc.h"
12#include "ssh.h"
13
Damien Miller95def091999-11-25 00:26:21 +110014/*
15 * Expands tildes in the file name. Returns data allocated by xmalloc.
16 * Warning: this calls getpw*.
17 */
18char *
19tilde_expand_filename(const char *filename, uid_t my_uid)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100020{
Damien Miller95def091999-11-25 00:26:21 +110021 const char *cp;
22 unsigned int userlen;
23 char *expanded;
24 struct passwd *pw;
25 char user[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +100026
Damien Miller95def091999-11-25 00:26:21 +110027 /* Return immediately if no tilde. */
28 if (filename[0] != '~')
29 return xstrdup(filename);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100030
Damien Miller95def091999-11-25 00:26:21 +110031 /* Skip the tilde. */
32 filename++;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100033
Damien Miller95def091999-11-25 00:26:21 +110034 /* Find where the username ends. */
35 cp = strchr(filename, '/');
36 if (cp)
37 userlen = cp - filename; /* Something after username. */
38 else
39 userlen = strlen(filename); /* Nothing after username. */
40 if (userlen == 0)
Damien Miller5428f641999-11-25 11:54:57 +110041 pw = getpwuid(my_uid); /* Own home directory. */
Damien Miller95def091999-11-25 00:26:21 +110042 else {
43 /* Tilde refers to someone elses home directory. */
44 if (userlen > sizeof(user) - 1)
45 fatal("User name after tilde too long.");
46 memcpy(user, filename, userlen);
47 user[userlen] = 0;
48 pw = getpwnam(user);
49 }
Damien Miller95def091999-11-25 00:26:21 +110050 if (!pw)
51 fatal("Unknown user %100s.", user);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052
Damien Miller95def091999-11-25 00:26:21 +110053 /* If referring to someones home directory, return it now. */
Damien Miller5428f641999-11-25 11:54:57 +110054 if (!cp) {
55 /* Only home directory specified */
Damien Miller95def091999-11-25 00:26:21 +110056 return xstrdup(pw->pw_dir);
57 }
58 /* Build a path combining the specified directory and path. */
59 expanded = xmalloc(strlen(pw->pw_dir) + strlen(cp + 1) + 2);
60 sprintf(expanded, "%s/%s", pw->pw_dir, cp + 1);
61 return expanded;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100062}