75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/* $NetBSD: tildexpand.c,v 1.6 2002/06/24 05:48:40 itojun Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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#include "includes.h"
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RCSID("$OpenBSD: tildexpand.c,v 1.13 2002/06/23 03:25:50 deraadt Exp $");
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#include "xmalloc.h"
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#include "log.h"
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#include "tildexpand.h"
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/*
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* Expands tildes in the file name. Returns data allocated by xmalloc.
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* Warning: this calls getpw*.
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*/
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char *
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tilde_expand_filename(const char *filename, uid_t my_uid)
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{
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const char *cp;
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u_int userlen;
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char *expanded;
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struct passwd *pw;
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char user[100];
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int len;
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/* Return immediately if no tilde. */
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if (filename[0] != '~')
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return xstrdup(filename);
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/* Skip the tilde. */
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filename++;
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/* Find where the username ends. */
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cp = strchr(filename, '/');
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if (cp)
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userlen = cp - filename; /* Something after username. */
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else
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userlen = strlen(filename); /* Nothing after username. */
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if (userlen == 0)
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pw = getpwuid(my_uid); /* Own home directory. */
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else {
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/* Tilde refers to someone elses home directory. */
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if (userlen > sizeof(user) - 1)
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fatal("User name after tilde too long.");
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memcpy(user, filename, userlen);
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user[userlen] = 0;
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pw = getpwnam(user);
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}
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if (!pw)
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fatal("Unknown user %100s.", user);
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/* If referring to someones home directory, return it now. */
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if (!cp) {
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/* Only home directory specified */
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return xstrdup(pw->pw_dir);
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}
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/* Build a path combining the specified directory and path. */
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len = strlen(pw->pw_dir) + strlen(cp + 1) + 2;
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if (len > MAXPATHLEN)
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fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1);
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expanded = xmalloc(len);
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snprintf(expanded, len, "%s%s%s", pw->pw_dir,
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strcmp(pw->pw_dir, "/") ? "/" : "", cp + 1);
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return expanded;
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}
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