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