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DEFINITIONS
This source file includes following definitions.
- etc_getlogin
- safe_setup_str
- setup_passwd
- etc_getpwuid
- etc_getpwnam
- passwd_ensure
- passwd_iterate
- etc_passwd
- etc_setpwent
- etc_endpwent
- etc_getpwent
- setup_group
- etc_getgrgid
- etc_getgrnam
- group_ensure
- group_iterate
- etc_group
- etc_setgrent
- etc_endgrent
- etc_getgrent
- Init_etc
/************************************************
etc.c -
$Author: nobu $
created at: Tue Mar 22 18:39:19 JST 1994
************************************************/
#include "ruby.h"
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_GETPWENT
#include <pwd.h>
#endif
#ifdef HAVE_GETGRENT
#include <grp.h>
#endif
#ifndef HAVE_TYPE_UID_T
#define uid_t int
#endif
static VALUE sPasswd;
#ifdef HAVE_GETGRENT
static VALUE sGroup;
#endif
#ifndef _WIN32
char *getenv();
#endif
char *getlogin();
/* Returns the short user name of the currently logged in user.
* Unfortunately, it is often rather easy to fool getlogin().
* Avoid getlogin() for security-related purposes.
*
* e.g.
* Etc.getlogin -> 'guest'
*/
static VALUE
etc_getlogin(VALUE obj)
{
char *login;
rb_secure(4);
#ifdef HAVE_GETLOGIN
login = getlogin();
if (!login) login = getenv("USER");
#else
login = getenv("USER");
#endif
if (login)
return rb_tainted_str_new2(login);
return Qnil;
}
#if defined(HAVE_GETPWENT) || defined(HAVE_GETGRENT)
static VALUE
safe_setup_str(const char *str)
{
if (str == 0) str = "";
return rb_tainted_str_new2(str);
}
#endif
#ifdef HAVE_GETPWENT
static VALUE
setup_passwd(struct passwd *pwd)
{
if (pwd == 0) rb_sys_fail("/etc/passwd");
return rb_struct_new(sPasswd,
safe_setup_str(pwd->pw_name),
#ifdef HAVE_ST_PW_PASSWD
safe_setup_str(pwd->pw_passwd),
#endif
UIDT2NUM(pwd->pw_uid),
GIDT2NUM(pwd->pw_gid),
#ifdef HAVE_ST_PW_GECOS
safe_setup_str(pwd->pw_gecos),
#endif
safe_setup_str(pwd->pw_dir),
safe_setup_str(pwd->pw_shell),
#ifdef HAVE_ST_PW_CHANGE
INT2NUM(pwd->pw_change),
#endif
#ifdef HAVE_ST_PW_QUOTA
INT2NUM(pwd->pw_quota),
#endif
#ifdef HAVE_ST_PW_AGE
PW_AGE2VAL(pwd->pw_age),
#endif
#ifdef HAVE_ST_PW_CLASS
safe_setup_str(pwd->pw_class),
#endif
#ifdef HAVE_ST_PW_COMMENT
safe_setup_str(pwd->pw_comment),
#endif
#ifdef HAVE_ST_PW_EXPIRE
INT2NUM(pwd->pw_expire),
#endif
0 /*dummy*/
);
}
#endif
/* Returns the /etc/passwd information for the user with specified integer
* user id (uid).
*
* The information is returned as a Struct::Passwd; see getpwent above for
* details.
*
* e.g. * Etc.getpwuid(0) -> #<struct Struct::Passwd name="root",
* passwd="x", uid=0, gid=0, gecos="root",dir="/root", shell="/bin/bash">
*/
static VALUE
etc_getpwuid(int argc, VALUE *argv, VALUE obj)
{
#if defined(HAVE_GETPWENT)
VALUE id;
uid_t uid;
struct passwd *pwd;
rb_secure(4);
if (rb_scan_args(argc, argv, "01", &id) == 1) {
uid = NUM2UIDT(id);
}
else {
uid = getuid();
}
pwd = getpwuid(uid);
if (pwd == 0) rb_raise(rb_eArgError, "can't find user for %d", (int)uid);
return setup_passwd(pwd);
#else
return Qnil;
#endif
}
/* Returns the /etc/passwd information for the user with specified login name.
*
* The information is returned as a Struct::Passwd; see getpwent above for
* details.
*
* e.g. * Etc.getpwnam('root') -> #<struct Struct::Passwd name="root",
* passwd="x", uid=0, gid=0, gecos="root",dir="/root", shell="/bin/bash">
*/
static VALUE
etc_getpwnam(VALUE obj, VALUE nam)
{
#ifdef HAVE_GETPWENT
struct passwd *pwd;
SafeStringValue(nam);
pwd = getpwnam(RSTRING_PTR(nam));
if (pwd == 0) rb_raise(rb_eArgError, "can't find user for %s", RSTRING_PTR(nam));
return setup_passwd(pwd);
#else
return Qnil;
#endif
}
#ifdef HAVE_GETPWENT
static int passwd_blocking = 0;
static VALUE
passwd_ensure(void)
{
passwd_blocking = Qfalse;
return Qnil;
}
static VALUE
passwd_iterate(void)
{
struct passwd *pw;
setpwent();
while (pw = getpwent()) {
rb_yield(setup_passwd(pw));
}
endpwent();
return Qnil;
}
#endif
/* Provides a convenient Ruby iterator which executes a block for each entry
* in the /etc/passwd file.
*
* The code block is passed an Struct::Passwd struct; see getpwent above for
* details.
*
* Example:
*
* require 'etc'
*
* Etc.passwd {|u|
* puts u.name + " = " + u.gecos
* }
*
*/
static VALUE
etc_passwd(VALUE obj)
{
#ifdef HAVE_GETPWENT
struct passwd *pw;
rb_secure(4);
if (rb_block_given_p()) {
if (passwd_blocking) {
rb_raise(rb_eRuntimeError, "parallel passwd iteration");
}
passwd_blocking = Qtrue;
rb_ensure(passwd_iterate, 0, passwd_ensure, 0);
}
if (pw = getpwent()) {
return setup_passwd(pw);
}
#endif
return Qnil;
}
/* Resets the process of reading the /etc/passwd file, so that the next call
* to getpwent will return the first entry again.
*/
static VALUE
etc_setpwent(VALUE obj)
{
#ifdef HAVE_GETPWENT
setpwent();
#endif
return Qnil;
}
/* Ends the process of scanning through the /etc/passwd file begun with
* getpwent, and closes the file.
*/
static VALUE
etc_endpwent(VALUE obj)
{
#ifdef HAVE_GETPWENT
endpwent();
#endif
return Qnil;
}
/* Returns an entry from the /etc/passwd file. The first time it is called it
* opens the file and returns the first entry; each successive call returns
* the next entry, or nil if the end of the file has been reached.
*
* To close the file when processing is complete, call endpwent.
*
* Each entry is returned as a Struct::Passwd:
*
* - Passwd#name contains the short login name of the user as a String.
*
* - Passwd#passwd contains the encrypted password of the user as a String.
* an 'x' is returned if shadow passwords are in use. An '*' is returned
* if the user cannot log in using a password.
*
* - Passwd#uid contains the integer user ID (uid) of the user.
*
* - Passwd#gid contains the integer group ID (gid) of the user's primary group.
*
* - Passwd#gecos contains a longer String description of the user, such as
* a full name. Some Unix systems provide structured information in the
* gecos field, but this is system-dependent.
*
* - Passwd#dir contains the path to the home directory of the user as a String.
*
* - Passwd#shell contains the path to the login shell of the user as a String.
*/
static VALUE
etc_getpwent(VALUE obj)
{
#ifdef HAVE_GETPWENT
struct passwd *pw;
if (pw = getpwent()) {
return setup_passwd(pw);
}
#endif
return Qnil;
}
#ifdef HAVE_GETGRENT
static VALUE
setup_group(struct group *grp)
{
VALUE mem;
char **tbl;
mem = rb_ary_new();
tbl = grp->gr_mem;
while (*tbl) {
rb_ary_push(mem, safe_setup_str(*tbl));
tbl++;
}
return rb_struct_new(sGroup,
safe_setup_str(grp->gr_name),
#ifdef HAVE_ST_GR_PASSWD
safe_setup_str(grp->gr_passwd),
#endif
GIDT2NUM(grp->gr_gid),
mem);
}
#endif
/* Returns information about the group with specified integer group id (gid),
* as found in /etc/group.
*
* The information is returned as a Struct::Group; see getgrent above for
* details.
*
* e.g. Etc.getgrgid(100) -> #<struct Struct::Group name="users", passwd="x",
* gid=100, mem=["meta", "root"]>
*
*/
static VALUE
etc_getgrgid(int argc, VALUE *argv, VALUE obj)
{
#ifdef HAVE_GETGRENT
VALUE id;
gid_t gid;
struct group *grp;
rb_secure(4);
if (rb_scan_args(argc, argv, "01", &id) == 1) {
gid = NUM2GIDT(id);
}
else {
gid = getgid();
}
grp = getgrgid(gid);
if (grp == 0) rb_raise(rb_eArgError, "can't find group for %d", (int)gid);
return setup_group(grp);
#else
return Qnil;
#endif
}
/* Returns information about the group with specified String name, as found
* in /etc/group.
*
* The information is returned as a Struct::Group; see getgrent above for
* details.
*
* e.g. Etc.getgrnam('users') -> #<struct Struct::Group name="users",
* passwd="x", gid=100, mem=["meta", "root"]>
*
*/
static VALUE
etc_getgrnam(VALUE obj, VALUE nam)
{
#ifdef HAVE_GETGRENT
struct group *grp;
rb_secure(4);
SafeStringValue(nam);
grp = getgrnam(RSTRING_PTR(nam));
if (grp == 0) rb_raise(rb_eArgError, "can't find group for %s", RSTRING_PTR(nam));
return setup_group(grp);
#else
return Qnil;
#endif
}
#ifdef HAVE_GETGRENT
static int group_blocking = 0;
static VALUE
group_ensure(void)
{
group_blocking = Qfalse;
return Qnil;
}
static VALUE
group_iterate(void)
{
struct group *pw;
setgrent();
while (pw = getgrent()) {
rb_yield(setup_group(pw));
}
endgrent();
return Qnil;
}
#endif
/* Provides a convenient Ruby iterator which executes a block for each entry
* in the /etc/group file.
*
* The code block is passed an Struct::Group struct; see getgrent above for
* details.
*
* Example:
*
* require 'etc'
*
* Etc.group {|g|
* puts g.name + ": " + g.mem.join(', ')
* }
*
*/
static VALUE
etc_group(VALUE obj)
{
#ifdef HAVE_GETGRENT
struct group *grp;
rb_secure(4);
if (rb_block_given_p()) {
if (group_blocking) {
rb_raise(rb_eRuntimeError, "parallel group iteration");
}
group_blocking = Qtrue;
rb_ensure(group_iterate, 0, group_ensure, 0);
}
if (grp = getgrent()) {
return setup_group(grp);
}
#endif
return Qnil;
}
/* Resets the process of reading the /etc/group file, so that the next call
* to getgrent will return the first entry again.
*/
static VALUE
etc_setgrent(VALUE obj)
{
#ifdef HAVE_GETGRENT
setgrent();
#endif
return Qnil;
}
/* Ends the process of scanning through the /etc/group file begun by
* getgrent, and closes the file.
*/
static VALUE
etc_endgrent(VALUE obj)
{
#ifdef HAVE_GETGRENT
endgrent();
#endif
return Qnil;
}
/* Returns an entry from the /etc/group file. The first time it is called it
* opens the file and returns the first entry; each successive call returns
* the next entry, or nil if the end of the file has been reached.
*
* To close the file when processing is complete, call endgrent.
*
* Each entry is returned as a Struct::Group:
*
* - Group#name contains the name of the group as a String.
*
* - Group#passwd contains the encrypted password as a String. An 'x' is
* returned if password access to the group is not available; an empty
* string is returned if no password is needed to obtain membership of
* the group.
*
* - Group#gid contains the group's numeric ID as an integer.
*
* - Group#mem is an Array of Strings containing the short login names of the
* members of the group.
*/
static VALUE
etc_getgrent(VALUE obj)
{
#ifdef HAVE_GETGRENT
struct group *gr;
if (gr = getgrent()) {
return setup_group(gr);
}
#endif
return Qnil;
}
/* The etc module provides access to information from the /etc/passwd and
* /etc/group files on Linux and Unix systems.
*
* Documented by mathew <meta@pobox.com>.
*/
void
Init_etc(void)
{
VALUE mEtc;
mEtc = rb_define_module("Etc");
rb_define_module_function(mEtc, "getlogin", etc_getlogin, 0);
rb_define_module_function(mEtc, "getpwuid", etc_getpwuid, -1);
rb_define_module_function(mEtc, "getpwnam", etc_getpwnam, 1);
rb_define_module_function(mEtc, "setpwent", etc_setpwent, 0);
rb_define_module_function(mEtc, "endpwent", etc_endpwent, 0);
rb_define_module_function(mEtc, "getpwent", etc_getpwent, 0);
rb_define_module_function(mEtc, "passwd", etc_passwd, 0);
rb_define_module_function(mEtc, "getgrgid", etc_getgrgid, -1);
rb_define_module_function(mEtc, "getgrnam", etc_getgrnam, 1);
rb_define_module_function(mEtc, "group", etc_group, 0);
rb_define_module_function(mEtc, "setgrent", etc_setgrent, 0);
rb_define_module_function(mEtc, "endgrent", etc_endgrent, 0);
rb_define_module_function(mEtc, "getgrent", etc_getgrent, 0);
sPasswd = rb_struct_define("Passwd",
"name", "passwd", "uid", "gid",
#ifdef HAVE_ST_PW_GECOS
"gecos",
#endif
"dir", "shell",
#ifdef HAVE_ST_PW_CHANGE
"change",
#endif
#ifdef HAVE_ST_PW_QUOTA
"quota",
#endif
#ifdef HAVE_ST_PW_AGE
"age",
#endif
#ifdef HAVE_ST_PW_CLASS
"uclass",
#endif
#ifdef HAVE_ST_PW_COMMENT
"comment",
#endif
#ifdef HAVE_ST_PW_EXPIRE
"expire",
#endif
NULL);
rb_define_const(mEtc, "Passwd", sPasswd);
#ifdef HAVE_GETGRENT
sGroup = rb_struct_define("Group", "name",
#ifdef HAVE_ST_GR_PASSWD
"passwd",
#endif
"gid", "mem", NULL);
rb_define_const(mEtc, "Group", sGroup);
#endif
}
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