first import

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@1 7dcaeef0-15fb-0310-b436-a5af3365683c

libssh/misc.c

@@ -0,0 +1,98 @@
+/* misc.c */
+/* some misc routines than aren't really part of the ssh protocols but can be useful to the client */
+
+/*
+Copyright 2003 Aris Adamantiadis
+
+This file is part of the SSH Library
+
+The SSH Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The SSH Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the SSH Library; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <netdb.h>
+#include "libssh/libssh.h"
+
+/* if the program was executed suid root, don't trust the user ! */
+static int is_trusted(){
+    if(geteuid()!=getuid())
+        return 0;
+    return 1;
+}
+
+static char *get_homedir_from_uid(int uid){
+    struct passwd *pwd;
+    char *home;
+    while((pwd=getpwent())){
+        if(pwd->pw_uid == uid){
+            home=strdup(pwd->pw_dir);
+            endpwent();
+            return home;
+        }
+    }
+    endpwent();
+    return NULL;
+}
+
+static char *get_homedir_from_login(char *user){
+    struct passwd *pwd;
+    char *home;
+    while((pwd=getpwent())){
+        if(!strcmp(pwd->pw_name,user)){
+            home=strdup(pwd->pw_dir);
+            endpwent();
+            return home;
+        }
+    }
+    endpwent();
+    return NULL;
+}
+        
+char *ssh_get_user_home_dir(){
+    char *home;
+    char *user;
+    int trusted=is_trusted();
+    if(trusted){
+        if((home=getenv("HOME")))
+            return strdup(home);
+        if((user=getenv("USER")))
+            return get_homedir_from_login(user);
+    }
+    return get_homedir_from_uid(getuid());
+}
+
+/* we have read access on file */
+int ssh_file_readaccess_ok(char *file){
+    if(!access(file,R_OK))
+        return 1;
+    return 0;
+}
+
+
+u64 ntohll(u64 a){
+#ifdef WORDS_BIGENDIAN
+    return a;
+#else
+    u32 low=a & 0xffffffff;
+    u32 high = a >> 32 ;
+    low=ntohl(low);
+    high=ntohl(high);
+    return (( ((u64)low) << 32) | ( high));
+#endif
+}