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1 | /* | |
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 | * | |
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". | |
11 | */ | |
12 | ||
13 | #include "includes.h" | |
14 | RCSID("$OpenBSD: tildexpand.c,v 1.12 2001/08/11 22:51:27 jakob Exp $"); | |
15 | ||
16 | #include "xmalloc.h" | |
17 | #include "log.h" | |
18 | #include "tildexpand.h" | |
19 | ||
20 | /* | |
21 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
22 | * Warning: this calls getpw*. | |
23 | */ | |
24 | char * | |
25 | tilde_expand_filename(const char *filename, uid_t my_uid) | |
26 | { | |
27 | const char *cp; | |
28 | u_int userlen; | |
29 | char *expanded; | |
30 | struct passwd *pw; | |
31 | char user[100]; | |
32 | int len; | |
33 | ||
34 | /* Return immediately if no tilde. */ | |
35 | if (filename[0] != '~') | |
36 | return xstrdup(filename); | |
37 | ||
38 | /* Skip the tilde. */ | |
39 | filename++; | |
40 | ||
41 | /* Find where the username ends. */ | |
42 | cp = strchr(filename, '/'); | |
43 | if (cp) | |
44 | userlen = cp - filename; /* Something after username. */ | |
45 | else | |
46 | userlen = strlen(filename); /* Nothing after username. */ | |
47 | if (userlen == 0) | |
48 | pw = getpwuid(my_uid); /* Own home directory. */ | |
49 | else { | |
50 | /* Tilde refers to someone elses home directory. */ | |
51 | if (userlen > sizeof(user) - 1) | |
52 | fatal("User name after tilde too long."); | |
53 | memcpy(user, filename, userlen); | |
54 | user[userlen] = 0; | |
55 | pw = getpwnam(user); | |
56 | } | |
57 | if (!pw) | |
58 | fatal("Unknown user %100s.", user); | |
59 | ||
60 | /* If referring to someones home directory, return it now. */ | |
61 | if (!cp) { | |
62 | /* Only home directory specified */ | |
63 | return xstrdup(pw->pw_dir); | |
64 | } | |
65 | /* Build a path combining the specified directory and path. */ | |
66 | len = strlen(pw->pw_dir) + strlen(cp + 1) + 2; | |
67 | if (len > MAXPATHLEN) | |
68 | fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1); | |
69 | expanded = xmalloc(len); | |
70 | snprintf(expanded, len, "%s%s%s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", cp + 1); | |
71 | return expanded; | |
72 | } |