NetBSD Problem Report #60930

From www@netbsd.org  Tue Oct 27 06:53:04 2026
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Date: Tue, 27 Oct 2026 06:53:03 +0000 (UTC)
From: netbsd@linear.network
Reply-To: netbsd@linear.network
To: gnats-bugs@NetBSD.org
Subject: ftp with file:/// uri fails, ftp_strdup: called with NULL argument
X-Send-Pr-Version: www-1.0
X-From4GNATS: "netbsd@linear.network via gnats" <gnats-admin@NetBSD.org>

>Number:         60930
>Category:       bin
>Synopsis:       ftp with file:/// uri fails, ftp_strdup: called with NULL argument
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 27 06:55:00 +0000 2026
>Last-Modified:  Tue Oct 27 09:50:01 +0000 2026
>Originator:     linear
>Release:        11.0
>Organization:
>Environment:
NetBSD dreamcast 11.0 NetBSD 11.0 (GENERIC) #0: Thu Jul 30 15:23:12 UTC 2026  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/dreamcast/compile/GENERIC dreamcast
>Description:
the ftp program is documented in its man page as supporting file:// uri for obtaining files.

however, when attempting to use that functionality, the following error is produced:

    ftp: ftp_strdup: called with NULL argument

>How-To-Repeat:
attempt to fetch a file from the local filesystem using the ftp program, using a file:// uri:

$ ftp ftp:///netbsd
ftp: ftp_strdup: called with NULL argument
$ ftp ftp:///etc/profile
ftp: ftp_strdup: called with NULL argument

>Fix:

>Audit-Trail:
From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: bin/60930: ftp with file:/// uri fails, ftp_strdup: called with
 NULL argument
Date: Tue, 27 Oct 2026 10:03:01 +0100

 (gdb) break errx
 Breakpoint 2 at 0xf73433cc: file /work/src/lib/libc/gen/errx.c, line 56.
 (gdb) run
 Starting program: /usr/bin/ftp file:///netbsd
 Breakpoint 2, _errx (eval=eval@entry=1, 
     fmt=fmt@entry=0x961d734 "ftp_strdup: called with NULL argument")
     at /work/src/lib/libc/gen/errx.c:56
 warning: 56     /work/src/lib/libc/gen/errx.c: No such file or directory
 (gdb) bt
 #0  _errx (eval=eval@entry=1, 
     fmt=fmt@entry=0x961d734 "ftp_strdup: called with NULL argument")
     at /work/src/lib/libc/gen/errx.c:56
 #1  0x096156d4 in ftp_strdup (str=str@entry=0x0)
     at /work/src/usr.bin/ftp/util.c:1602
 #2  0x0960518c in copyurlinfo (dui=0xfffce370, sui=0xfffce35c)
     at /work/src/usr.bin/ftp/fetch.c:240
 #3  fetch_url (url=0xfffcf781 "file:///netbsd", proxyenv=<optimized out>, 
     proxyauth=0x0, wwwauth=0x0, rui=0x0) at /work/src/usr.bin/ftp/fetch.c:1460
 #4  0x0960801c in auto_fetch (argc=1, argv=0xfffcf248)
     at /work/src/usr.bin/ftp/fetch.c:2421
 #5  0x09617a0c in main (argc=<optimized out>, argv=<optimized out>)
     at /work/src/usr.bin/ftp/main.c:550

 (gdb) up 2
 #2  0x0960518c in copyurlinfo (dui=0xfffce370, sui=0xfffce35c)
     at /work/src/usr.bin/ftp/fetch.c:240
 warning: 240    /work/src/usr.bin/ftp/fetch.c: No such file or directory
 (gdb) p *sui
 $1 = {host = 0x0, port = 0xf5c580f0 "", path = 0xf5c580e8 "/netbsd", 
   utype = FILE_URL_T, portnum = 0}
 (gdb) p *dui
 $2 = {host = 0x0, port = 0x0, path = 0x0, utype = UNKNOWN_URL_T, portnum = 0}


 I guess the three ftp_strdup in that function should all be replaced
 by an if testing for NULL and setting the target to NULL in that case.

 Martin

From: RVP <rvp@SDF.ORG>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: bin/60930: ftp with file:/// uri fails, ftp_strdup: called with
 NULL argument
Date: Tue, 27 Oct 2026 09:49:37 +0000 (UTC)

 On Tue, 27 Oct 2026, netbsd@linear.network via gnats wrote:

 >> Description:
 > the ftp program is documented in its man page as supporting file:// uri for obtaining files.
 >
 > however, when attempting to use that functionality, the following error is produced:
 >
 >    ftp: ftp_strdup: called with NULL argument
 >
 >> How-To-Repeat:
 > attempt to fetch a file from the local filesystem using the ftp program, using a file:// uri:
 >
 > $ ftp ftp:///netbsd
 > ftp: ftp_strdup: called with NULL argument
 >

 Try:

 ```
 --- src/usr.bin/ftp/fetch.c.orig	2026-07-20 04:05:14.623169837 +0000
 +++ src/usr.bin/ftp/fetch.c	2026-10-27 09:41:19.950487587 +0000
 @@ -579,7 +579,7 @@
   #endif /* INET6 */
   		if ((cp = strchr(thost, ':')) != NULL)
   			*cp++ = '\0';
 -	if (*thost != '\0')
 +	// if (*thost != '\0')
   		ui->host = thost;

   			/* look for [:port] */
 ```

 -RVP

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