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8efc0c15 | 1 | /* |
5260325f | 2 | * 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 | */ | |
8efc0c15 | 7 | |
8 | #include "includes.h" | |
74fc9186 | 9 | RCSID("$OpenBSD: tildexpand.c,v 1.7 2000/06/20 01:39:45 markus Exp $"); |
8efc0c15 | 10 | |
11 | #include "xmalloc.h" | |
12 | #include "ssh.h" | |
13 | ||
5260325f | 14 | /* |
15 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
16 | * Warning: this calls getpw*. | |
17 | */ | |
18 | char * | |
19 | tilde_expand_filename(const char *filename, uid_t my_uid) | |
8efc0c15 | 20 | { |
5260325f | 21 | const char *cp; |
22 | unsigned int userlen; | |
23 | char *expanded; | |
24 | struct passwd *pw; | |
25 | char user[100]; | |
a408af76 | 26 | int len; |
5260325f | 27 | |
28 | /* Return immediately if no tilde. */ | |
29 | if (filename[0] != '~') | |
30 | return xstrdup(filename); | |
31 | ||
32 | /* Skip the tilde. */ | |
33 | filename++; | |
34 | ||
35 | /* Find where the username ends. */ | |
36 | cp = strchr(filename, '/'); | |
37 | if (cp) | |
38 | userlen = cp - filename; /* Something after username. */ | |
39 | else | |
40 | userlen = strlen(filename); /* Nothing after username. */ | |
41 | if (userlen == 0) | |
aa3378df | 42 | pw = getpwuid(my_uid); /* Own home directory. */ |
5260325f | 43 | else { |
44 | /* Tilde refers to someone elses home directory. */ | |
45 | if (userlen > sizeof(user) - 1) | |
46 | fatal("User name after tilde too long."); | |
47 | memcpy(user, filename, userlen); | |
48 | user[userlen] = 0; | |
49 | pw = getpwnam(user); | |
50 | } | |
5260325f | 51 | if (!pw) |
52 | fatal("Unknown user %100s.", user); | |
53 | ||
54 | /* If referring to someones home directory, return it now. */ | |
aa3378df | 55 | if (!cp) { |
56 | /* Only home directory specified */ | |
5260325f | 57 | return xstrdup(pw->pw_dir); |
58 | } | |
59 | /* Build a path combining the specified directory and path. */ | |
a408af76 | 60 | len = strlen(pw->pw_dir) + strlen(cp + 1) + 2; |
61 | if (len > MAXPATHLEN) | |
62 | fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1); | |
63 | expanded = xmalloc(len); | |
64 | snprintf(expanded, len, "%s/%s", pw->pw_dir, cp + 1); | |
5260325f | 65 | return expanded; |
8efc0c15 | 66 | } |