# Large uid's with Etc.getpwnam

**URL:** <https://www.ruby-forum.com/t/large-uids-with-etc-getpwnam/96124>\
**Category:** Ruby\
**Created:** [June 26, 2006, 5:12pm UTC](https://www.ruby-forum.com/t/large-uids-with-etc-getpwnam/96124 "2006-06-26T17:12:55Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ryan\_McGovern](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ccd318/32.png) [@Ryan\_McGovern](https://www.ruby-forum.com/u/Ryan_McGovern)\
**Post date:** [June 26, 2006, 5:12pm UTC](https://www.ruby-forum.com/t/large-uids-with-etc-getpwnam/96124/1 "2006-06-26T17:12:55Z")

</div>

I beleve there is a bug in Etc.getpwnam. On our OS X server running  
10.4 with ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0] we use AD for user  
management.  
The two id’s the one that is my real id i got from ls -ln and the one  
from getpwnam differ only in the sign bit, so it looks like ruby is  
treating it as a 1’s compliment number when it is an unsigned int. i  
could change if you take -566183520 & 0x7FFFFFFF in ruby it will return  
the proper number 1581300128. The same happens for all users with  
larger id’s in our AD system.

irb(main):016:0\> Etc.getpwuid(1581300128)  
=\> #\<struct Struct::Passwd name=“mcgoverp”, passwd="\*\*\*\*\*\*\*\*",  
uid=-566183520, gid=513, gecos=“Ryan McGovern”,  
dir="/Network/Servers/ucfilespace.uc.edu/Home/m/mcgoverp",  
shell="/usr/local/profile", change=0, uclass="", expire=0\>

irb(main):017:0\> uinf=Etc.getpwnam(“mcgoverp”)  
=\> #\<struct Struct::Passwd name=“mcgoverp”, passwd="\*\*\*\*\*\*\*\*",  
uid=-566183520, gid=513, gecos=“Ryan McGovern”,  
dir="/Network/Servers/ucfilespace.uc.edu/Home/m/mcgoverp",  
shell="/usr/local/profile", change=0, uclass="", expire=0\>

irb(main):019:0\> Etc.getpwuid(-566183520)  
ArgumentError: can’t find user for -566183520  
from (irb):19:in `getpwuid’  
from (irb):19  
from :0

irb(main):005:0\> Etc.getpwnam(“monkir”)  
=\> #\<struct Struct::Passwd name=“monkir”, passwd=“**",  
uid=-476125468, gid=513, gecos=“Ian Monk”,  
dir="/Network/Servers/ucfilespace.uc.edu/Home/m/monkir",  
shell="/bin/bash", change=0, uclass="", expire=0\>  
irb(main):006:0\> Etc.getpwnam(“monkir”).uid & 0x7FFFFFFF  
=\> 1671358180  
irb(main):007:0\> Etc.getpwuid(1671358180)  
=\> #\<struct Struct::Passwd name=“monkir”, passwd="**”,  
uid=-476125468, gid=513, gecos=“Ian Monk”,  
dir="/Network/Servers/ucfilespace.uc.edu/Home/m/monkir",  
shell="/bin/bash", change=0, uclass="", expire=0\>

---

<div class="post-metadata">

**Author:** ![Ryan\_McGovern](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ccd318/32.png) [@Ryan\_McGovern](https://www.ruby-forum.com/u/Ryan_McGovern)\
**Post date:** [June 26, 2006, 7:11pm UTC](https://www.ruby-forum.com/t/large-uids-with-etc-getpwnam/96124/2 "2006-06-26T19:11:58Z")

</div>

Hi,

At Tue, 27 Jun 2006 00:06:18 +0900,  
Ryan McGovern wrote in [ruby-talk:199102]:

> I beleve there is a bug in Etc.getpwnam. On our OS X server  
> running 10.4 with ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0]  
> we use AD for user management.

Does this help?

- ext/etc/etc.c (setup\_passwd, setup\_group): allow bignum uid, gid and  
so on. [ruby-talk:199102]

# Index: ext/etc/etc.c

RCS file: /cvs/ruby/src/ruby/ext/etc/etc.c,v  
retrieving revision 1.22  
diff -p -u -2 -r1.22 etc.c  
— ext/etc/etc.c 20 Jun 2006 18:02:14 -0000 1.22  
+++ ext/etc/etc.c 26 Jun 2006 16:53:48 -0000  
@@ -77,6 +77,6 @@ setup\_passwd(struct passwd \*pwd)  
safe\_setup\_str(pwd-\>pw\_passwd),  
#endif

- 

```
  	 INT2FIX(pwd->pw_uid),

```

- 

```
  	 INT2FIX(pwd->pw_gid),

```

- 

```
  	 PW_UID2VAL(pwd->pw_uid),

```

- 

```
  	 PW_GID2VAL(pwd->pw_gid),

```

#ifdef HAVE\_ST\_PW\_GECOS  
safe\_setup\_str(pwd-\>pw\_gecos),  
@@ -85,8 +85,8 @@ setup\_passwd(struct passwd \*pwd)  
safe\_setup\_str(pwd-\>pw\_shell),  
#ifdef HAVE\_ST\_PW\_CHANGE

- 

```
  	 INT2FIX(pwd->pw_change),

```

- 

```
  	 INT2NUM(pwd->pw_change),

```

#endif  
#ifdef HAVE\_ST\_PW\_QUOTA

- 

```
  	 INT2FIX(pwd->pw_quota),

```

- 

```
  	 INT2NUM(pwd->pw_quota),

```

#endif  
#ifdef HAVE\_ST\_PW\_AGE  
@@ -100,5 +100,5 @@ setup\_passwd(struct passwd \*pwd)  
#endif  
#ifdef HAVE\_ST\_PW\_EXPIRE

- 

```
  	 INT2FIX(pwd->pw_expire),

```

- 

```
  	 INT2NUM(pwd->pw_expire),

```

#endif  
0 /_dummy_/  
@@ -302,5 +302,5 @@ setup\_group(struct group \*grp)  
safe\_setup\_str(grp-\>gr\_passwd),  
#endif

- 

```
  	 INT2FIX(grp->gr_gid),

```

- 

```
  	 PW_GID2VAL(grp->gr_gid),
  	 mem);

```

# } Index: ext/etc/extconf.rb

RCS file: /cvs/ruby/src/ruby/ext/etc/extconf.rb,v  
retrieving revision 1.6  
diff -p -u -2 -r1.6 extconf.rb  
— ext/etc/extconf.rb 6 Sep 2005 23:35:15 -0000 1.6  
+++ ext/etc/extconf.rb 26 Jun 2006 17:05:23 -0000  
@@ -25,5 +25,18 @@ if a or b or c  
have\_struct\_member(‘struct passwd’, ‘pw\_passwd’, ‘pwd.h’)  
have\_struct\_member(‘struct group’, ‘gr\_passwd’, ‘grp.h’)

- have\_type(“uid\_t”);

- have\_header(“lastlog.h”) and have\_header(“paths.h”)
- [%w"uid\_t pwd.h", %w"gid\_t grp.h"].each do |t, h|
- if have\_type(t, [“sys/types.h”, h])
- 

```
 if try_static_assert("sizeof(#{t}) > sizeof(long)")

```

- f = “LL2NUM”
- 

```
 else

```

- f = “INT2NUM”
- 

```
 end

```

- 

```
 if try_static_assert("(#{t})-1 > 0")

```

- f = “U#{f}”
- 

```
 end

```

- 

```
 $defs.push("-DPW_#{t.chomp('_t').upcase}2VAL=#{f}")

```

- end
- end  
create\_makefile(“etc”)  
end

---

<div class="post-metadata">

**Author:** ![Ryan\_McGovern](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ccd318/32.png) [@Ryan\_McGovern](https://www.ruby-forum.com/u/Ryan_McGovern)\
**Post date:** [June 26, 2006, 7:25pm UTC](https://www.ruby-forum.com/t/large-uids-with-etc-getpwnam/96124/3 "2006-06-26T19:25:17Z")

</div>

Hi,

At Tue, 27 Jun 2006 02:08:15 +0900,  
removed\_email\_address@domain.invalid wrote in [ruby-talk:199131]:

> At Tue, 27 Jun 2006 00:06:18 +0900,  
> Ryan McGovern wrote in [ruby-talk:199102]:
> 
> > I beleve there is a bug in Etc.getpwnam. On our OS X server  
> > running 10.4 with ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0]  
> > we use AD for user management.
> 
> Does this help?

Sorry, the patch for extconf.rb was wrong.

- ext/etc/etc.c (setup\_passwd, setup\_group): allow bignum uid, gid and  
so on. [ruby-talk:199102]

# Index: ext/etc/etc.c

RCS file: /cvs/ruby/src/ruby/ext/etc/etc.c,v  
retrieving revision 1.22  
diff -p -u -2 -r1.22 etc.c  
— ext/etc/etc.c 20 Jun 2006 18:02:14 -0000 1.22  
+++ ext/etc/etc.c 26 Jun 2006 16:53:48 -0000  
@@ -77,6 +77,6 @@ setup\_passwd(struct passwd \*pwd)  
safe\_setup\_str(pwd-\>pw\_passwd),  
#endif

- 

```
  	 INT2FIX(pwd->pw_uid),

```

- 

```
  	 INT2FIX(pwd->pw_gid),

```

- 

```
  	 PW_UID2VAL(pwd->pw_uid),

```

- 

```
  	 PW_GID2VAL(pwd->pw_gid),

```

#ifdef HAVE\_ST\_PW\_GECOS  
safe\_setup\_str(pwd-\>pw\_gecos),  
@@ -85,8 +85,8 @@ setup\_passwd(struct passwd \*pwd)  
safe\_setup\_str(pwd-\>pw\_shell),  
#ifdef HAVE\_ST\_PW\_CHANGE

- 

```
  	 INT2FIX(pwd->pw_change),

```

- 

```
  	 INT2NUM(pwd->pw_change),

```

#endif  
#ifdef HAVE\_ST\_PW\_QUOTA

- 

```
  	 INT2FIX(pwd->pw_quota),

```

- 

```
  	 INT2NUM(pwd->pw_quota),

```

#endif  
#ifdef HAVE\_ST\_PW\_AGE  
@@ -100,5 +100,5 @@ setup\_passwd(struct passwd \*pwd)  
#endif  
#ifdef HAVE\_ST\_PW\_EXPIRE

- 

```
  	 INT2FIX(pwd->pw_expire),

```

- 

```
  	 INT2NUM(pwd->pw_expire),

```

#endif  
0 /_dummy_/  
@@ -302,5 +302,5 @@ setup\_group(struct group \*grp)  
safe\_setup\_str(grp-\>gr\_passwd),  
#endif

- 

```
  	 INT2FIX(grp->gr_gid),

```

- 

```
  	 PW_GID2VAL(grp->gr_gid),
  	 mem);

```

# } Index: ext/etc/extconf.rb

RCS file: /cvs/ruby/src/ruby/ext/etc/extconf.rb,v  
retrieving revision 1.6  
diff -p -u -2 -r1.6 extconf.rb  
— ext/etc/extconf.rb 6 Sep 2005 23:35:15 -0000 1.6  
+++ ext/etc/extconf.rb 26 Jun 2006 17:05:23 -0000  
@@ -25,5 +25,18 @@ if a or b or c  
have\_struct\_member(‘struct passwd’, ‘pw\_passwd’, ‘pwd.h’)  
have\_struct\_member(‘struct group’, ‘gr\_passwd’, ‘grp.h’)

- have\_type(“uid\_t”);

- [%w"uid\_t pwd.h", %w"gid\_t grp.h"].each do |t, \*h|
- h \<\< “sys/types.h”
- if have\_type(t, h)
- 

```
 if try_static_assert("sizeof(#{t}) > sizeof(long)", h)

```

- f = “LL2NUM”
- 

```
 else

```

- f = “INT2NUM”
- 

```
 end

```

- 

```
 if try_static_assert("(#{t})-1 > 0", h)

```

- f = “U#{f}”
- 

```
 end

```

- 

```
 $defs.push("-DPW_#{t.chomp('_t').upcase}2VAL=#{f}")

```

- end
- end  
create\_makefile(“etc”)  
end

---

<div class="post-metadata">

**Author:** ![Ryan\_McGovern](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ccd318/32.png) [@Ryan\_McGovern](https://www.ruby-forum.com/u/Ryan_McGovern)\
**Post date:** [June 27, 2006, 1:30am UTC](https://www.ruby-forum.com/t/large-uids-with-etc-getpwnam/96124/4 "2006-06-27T01:30:11Z")

</div>

Hi,

In message “Re: Large uid’s with Etc.getpwnam”  
on Tue, 27 Jun 2006 02:22:36 +0900, removed\_email\_address@domain.invalid writes:

|\* ext/etc/etc.c (setup\_passwd, setup\_group): allow bignum uid, gid and  
| so on. [ruby-talk:199102]

Commit the fix please.

```
						matz.
```