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99 lines
2.4 KiB
99 lines
2.4 KiB
/* misc.c */
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/* some misc routines than aren't really part of the ssh protocols but can be useful to the client */
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/*
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Copyright 2003 Aris Adamantiadis
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This file is part of the SSH Library
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The SSH Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The SSH Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the SSH Library; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include <netdb.h>
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#include "libssh.h"
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/* if the program was executed suid root, don't trust the user ! */
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static int is_trusted(){
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if(geteuid()!=getuid())
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return 0;
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return 1;
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}
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static char *get_homedir_from_uid(int uid){
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struct passwd *pwd;
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char *home;
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while((pwd=getpwent())){
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if(pwd->pw_uid == uid){
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home=strdup(pwd->pw_dir);
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endpwent();
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return home;
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}
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}
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endpwent();
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return NULL;
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}
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static char *get_homedir_from_login(char *user){
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struct passwd *pwd;
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char *home;
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while((pwd=getpwent())){
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if(!strcmp(pwd->pw_name,user)){
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home=strdup(pwd->pw_dir);
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endpwent();
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return home;
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}
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}
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endpwent();
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return NULL;
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}
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char *ssh_get_user_home_dir(){
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char *home;
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char *user;
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int trusted=is_trusted();
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if(trusted){
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if((home=getenv("HOME")))
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return strdup(home);
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if((user=getenv("USER")))
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return get_homedir_from_login(user);
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}
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return get_homedir_from_uid(getuid());
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}
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/* we have read access on file */
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int ssh_file_readaccess_ok(char *file){
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if(!access(file,R_OK))
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return 1;
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return 0;
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}
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u64 ntohll(u64 a){
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#ifdef WORDS_BIGENDIAN
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return a;
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#else
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u32 low=a & 0xffffffff;
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u32 high = a >> 32 ;
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low=ntohl(low);
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high=ntohl(high);
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return (( ((u64)low) << 32) | ( high));
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#endif
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}
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