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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 | |
bcbf86ec | 5 | * |
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". | |
5260325f | 11 | */ |
8efc0c15 | 12 | |
13 | #include "includes.h" | |
bcbf86ec | 14 | RCSID("$OpenBSD: tildexpand.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $"); |
8efc0c15 | 15 | |
16 | #include "xmalloc.h" | |
17 | #include "ssh.h" | |
18 | ||
5260325f | 19 | /* |
20 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
21 | * Warning: this calls getpw*. | |
22 | */ | |
23 | char * | |
24 | tilde_expand_filename(const char *filename, uid_t my_uid) | |
8efc0c15 | 25 | { |
5260325f | 26 | const char *cp; |
27 | unsigned int userlen; | |
28 | char *expanded; | |
29 | struct passwd *pw; | |
30 | char user[100]; | |
a408af76 | 31 | int len; |
5260325f | 32 | |
33 | /* Return immediately if no tilde. */ | |
34 | if (filename[0] != '~') | |
35 | return xstrdup(filename); | |
36 | ||
37 | /* Skip the tilde. */ | |
38 | filename++; | |
39 | ||
40 | /* 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) | |
aa3378df | 47 | pw = getpwuid(my_uid); /* Own home directory. */ |
5260325f | 48 | 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 | } | |
5260325f | 56 | if (!pw) |
57 | fatal("Unknown user %100s.", user); | |
58 | ||
59 | /* If referring to someones home directory, return it now. */ | |
aa3378df | 60 | if (!cp) { |
61 | /* Only home directory specified */ | |
5260325f | 62 | return xstrdup(pw->pw_dir); |
63 | } | |
64 | /* Build a path combining the specified directory and path. */ | |
a408af76 | 65 | 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); | |
5260325f | 70 | return expanded; |
8efc0c15 | 71 | } |