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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM8PR09MB7095.namprd09.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9a0b0693-dc39-4617-4046-08da5b251469 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Jul 2022 05:46:44.0237 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 14b77578-9773-42d5-8507-251ca2dc2b06 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR09MB4775 X-OriginatorOrg: ncbi.nlm.nih.gov X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE, T_SPF_HELO_PERMERROR autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Jul 2022 05:46:54 -0000 Hi all, I am having an issue with socket file permissions... So here's a mockup of code that shows the problem: $ cat sun.c #include #include #include #include #include #include #include #define SOCKET "./.socket" int main() { struct sockaddr_un addr; struct stat st; mode_t u; int s; /* create a UNIX socket */ if ((s =3D socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { perror("socket"); return 1; } memset(&addr, 0, sizeof(addr)); addr.sun_family =3D PF_UNIX; strcpy(addr.sun_path, SOCKET); unlink(SOCKET); u =3D umask(0); if (bind(s, (struct sockaddr*) &addr, sizeof(addr)) !=3D 0) { perror("bind"); return 1; } umask(u); if (fchmod(s, 0666) < 0) printf("fchmod: %m\n"); if (fstat(s, &st) < 0) { perror("fstat"); return 1; } printf("fstat mode =3D %03o\n", st.st_mode); if (stat(SOCKET, &st) < 0) { perror("stat"); return 1; } printf("stat mode =3D %03o\n", st.st_mode); return 0; } $ gcc -Wall -o sun sun.c Now, if I run this code in my Cygwin home directory (and any directory that= I create using "mkdir..." under it), I am getting the expected results: $ ~/sun fstat mode =3D 140666 stat mode =3D 140666 $ ls -l .socket srw-rw-rw-+ 1 ANTON None 0 Jul 1 01:19 .socket=3D However, if I run it elsewhere (different drive "cd /cygdrive/g/cygwin" -- = it's NOT where Cygwin is installed, just a folder that keeps files for Cygwin development, the installation is = on C:\Cygwin64), I cannot predict the results. What's weird is that fstat and stat report different file mod= es. $ pwd /cygdrive/g/cygwin $ ~/sun fstat mode =3D 140666 stat mode =3D 140666 $ ls -l .socket srw-rw-rw-+ 1 ANTON None 0 Jul 1 01:24 .socket=3D So all's good here, BUT: $ mkdir subdir $ cd subdir $ pwd /cygdrive/g/cygwin/subdir $ ~/sun fstat mode =3D 140666 stat mode =3D 140664 $ ls -l .socket srw-rw-r--+ 1 ANTON None 0 Jul 1 01:25 .socket=3D Note that fstat lied! For some reason getfacl returns "Not supported", so I could not investigate= with that, but I'm showing below the icacls outputs for both /cygwin/g/cygwin and /cygdrive/g/cygwin/subdir = with their .socket files, respectively. At any rate, it looks like fstat, despite reporting the mode, wasn't actual= ly able to bake it on disk using those insanely complicated Windows permissions. What's more insane, is that using the chmod command from shell, I'm able to= change the permissions to 0666, and it sticks: $ pwd=20 /cygdrive/g/cygwin/subdir $ chmod 0666 .socket $ ls -l .socket srw-rw-rw-+ 1 ANTON None 0 Jul 1 01:25 .socket=3D Any insights will be highly appreciated! Thanks. $ pwd /cygdrive/g/cygwin $ icacls . . BUILTIN\Administrators:(I)(F) BUILTIN\Administrators:(I)(OI)(CI)(IO)(F) NT AUTHORITY\SYSTEM:(I)(F) NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F) NT AUTHORITY\Authenticated Users:(I)(M) NT AUTHORITY\Authenticated Users:(I)(OI)(CI)(IO)(M) BUILTIN\Users:(I)(RX) BUILTIN\Users:(I)(OI)(CI)(IO)(GR,GE) $ icacls .socket .socket NULL SID:(DENY)(Rc,S,WEA,X,DC) ANTON\ANTON:(R,W,D,WDAC,WO) ANTON\None:(DENY)(S,X) NT AUTHORITY\Authenticated Users:(DENY)(S,X) NT AUTHORITY\SYSTEM:(DENY)(S,X) BUILTIN\Administrators:(DENY)(S,X) BUILTIN\Users:(DENY)(S,X) ANTON\None:(RX,W) NT AUTHORITY\Authenticated Users:(RX,W) NT AUTHORITY\SYSTEM:(RX,W) BUILTIN\Administrators:(RX,W) BUILTIN\Users:(RX,W) Everyone:(R,W) $ cd subdir $ icacls . . NULL SID:(DENY)(Rc,S,REA,WEA,X,DC) ANTON\ANTON:(F) ANTON\None:(RX) NT AUTHORITY\Authenticated Users:(RX,W,DC) NT AUTHORITY\SYSTEM:(RX,W,DC) BUILTIN\Administrators:(RX,W,DC) BUILTIN\Users:(RX) Everyone:(RX) NULL SID:(OI)(CI)(IO)(DENY)(Rc,S,REA,WEA,X,DC) CREATOR OWNER:(OI)(CI)(IO)(F) CREATOR GROUP:(OI)(CI)(IO)(RX) NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(RX,W,DC) NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(RX,W,DC) BUILTIN\Administrators:(OI)(CI)(IO)(RX,W,DC) BUILTIN\Users:(OI)(CI)(IO)(RX) Everyone:(OI)(CI)(IO)(RX) As created by the program: $ icacls .socket .socket NULL SID:(DENY)(Rc,S,WEA,X,DC) ANTON\ANTON:(R,W,D,WDAC,WO) ANTON\None:(DENY)(S,X) NT AUTHORITY\Authenticated Users:(DENY)(S,X) NT AUTHORITY\SYSTEM:(DENY)(S,X) BUILTIN\Administrators:(DENY)(S,X) BUILTIN\Users:(DENY)(S,X) ANTON\None:(RX) NT AUTHORITY\Authenticated Users:(RX,W) NT AUTHORITY\SYSTEM:(RX,W) BUILTIN\Administrators:(RX,W) BUILTIN\Users:(RX) Everyone:(R) After chmod: $ icacls .socket .socket NULL SID:(DENY)(Rc,S,WEA,X,DC) ANTON\ANTON:(R,W,D,WDAC,WO) ANTON\None:(DENY)(S,X) NT AUTHORITY\Authenticated Users:(DENY)(S,X) NT AUTHORITY\SYSTEM:(DENY)(S,X) BUILTIN\Administrators:(DENY)(S,X) BUILTIN\Users:(DENY)(S,X) ANTON\None:(RX) NT AUTHORITY\Authenticated Users:(RX,W) NT AUTHORITY\SYSTEM:(RX,W) BUILTIN\Administrators:(RX,W) BUILTIN\Users:(RX) ANTON\None:(DENY)(W,DC) BUILTIN\Users:(DENY)(W,DC) Everyone:(R,W) Anton Lavrentiev Contractor NIH/NLM/NCBI