diff options
Diffstat (limited to 'libssh/misc.c')
-rw-r--r-- | libssh/misc.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/libssh/misc.c b/libssh/misc.c new file mode 100644 index 00000000..b9400f7d --- /dev/null +++ b/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 +} |