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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
Damien Millere4340be2000-09-16 13:29:08 +11005 *
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
Damien Miller95def091999-11-25 00:26:21 +110011 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100012
13#include "includes.h"
Damien Millere4340be2000-09-16 13:29:08 +110014RCSID("$OpenBSD: tildexpand.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100015
16#include "xmalloc.h"
17#include "ssh.h"
18
Damien Miller95def091999-11-25 00:26:21 +110019/*
20 * Expands tildes in the file name. Returns data allocated by xmalloc.
21 * Warning: this calls getpw*.
22 */
23char *
24tilde_expand_filename(const char *filename, uid_t my_uid)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100025{
Damien Miller95def091999-11-25 00:26:21 +110026 const char *cp;
27 unsigned int userlen;
28 char *expanded;
29 struct passwd *pw;
30 char user[100];
Damien Miller037a0dc1999-12-07 15:38:31 +110031 int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100032
Damien Miller95def091999-11-25 00:26:21 +110033 /* Return immediately if no tilde. */
34 if (filename[0] != '~')
35 return xstrdup(filename);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100036
Damien Miller95def091999-11-25 00:26:21 +110037 /* Skip the tilde. */
38 filename++;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100039
Damien Miller95def091999-11-25 00:26:21 +110040 /* Find where the username ends. */
41 cp = strchr(filename, '/');
42 if (cp)
43 userlen = cp - filename; /* Something after username. */
44 else
45 userlen = strlen(filename); /* Nothing after username. */
46 if (userlen == 0)
Damien Miller5428f641999-11-25 11:54:57 +110047 pw = getpwuid(my_uid); /* Own home directory. */
Damien Miller95def091999-11-25 00:26:21 +110048 else {
49 /* Tilde refers to someone elses home directory. */
50 if (userlen > sizeof(user) - 1)
51 fatal("User name after tilde too long.");
52 memcpy(user, filename, userlen);
53 user[userlen] = 0;
54 pw = getpwnam(user);
55 }
Damien Miller95def091999-11-25 00:26:21 +110056 if (!pw)
57 fatal("Unknown user %100s.", user);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058
Damien Miller95def091999-11-25 00:26:21 +110059 /* If referring to someones home directory, return it now. */
Damien Miller5428f641999-11-25 11:54:57 +110060 if (!cp) {
61 /* Only home directory specified */
Damien Miller95def091999-11-25 00:26:21 +110062 return xstrdup(pw->pw_dir);
63 }
64 /* Build a path combining the specified directory and path. */
Damien Miller037a0dc1999-12-07 15:38:31 +110065 len = strlen(pw->pw_dir) + strlen(cp + 1) + 2;
66 if (len > MAXPATHLEN)
67 fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1);
68 expanded = xmalloc(len);
69 snprintf(expanded, len, "%s/%s", pw->pw_dir, cp + 1);
Damien Miller95def091999-11-25 00:26:21 +110070 return expanded;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071}