LCOV - code coverage report
Current view: top level - src/common - username.c (source / functions) Hit Total Coverage
Test: PostgreSQL 12beta2 Lines: 11 16 68.8 %
Date: 2019-06-19 14:06:47 Functions: 2 2 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * username.c
       4             :  *    get user name
       5             :  *
       6             :  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  * IDENTIFICATION
      10             :  *    src/common/username.c
      11             :  *
      12             :  *-------------------------------------------------------------------------
      13             :  */
      14             : 
      15             : #ifndef FRONTEND
      16             : #include "postgres.h"
      17             : #else
      18             : #include "postgres_fe.h"
      19             : #endif
      20             : 
      21             : #include <pwd.h>
      22             : #include <unistd.h>
      23             : 
      24             : #include "common/username.h"
      25             : 
      26             : /*
      27             :  * Returns the current user name in a static buffer
      28             :  * On error, returns NULL and sets *errstr to point to a palloc'd message
      29             :  */
      30             : const char *
      31         648 : get_user_name(char **errstr)
      32             : {
      33             : #ifndef WIN32
      34             :     struct passwd *pw;
      35         648 :     uid_t       user_id = geteuid();
      36             : 
      37         648 :     *errstr = NULL;
      38             : 
      39         648 :     errno = 0;                  /* clear errno before call */
      40         648 :     pw = getpwuid(user_id);
      41         648 :     if (!pw)
      42             :     {
      43           0 :         *errstr = psprintf(_("could not look up effective user ID %ld: %s"),
      44             :                            (long) user_id,
      45           0 :                            errno ? strerror(errno) : _("user does not exist"));
      46           0 :         return NULL;
      47             :     }
      48             : 
      49         648 :     return pw->pw_name;
      50             : #else
      51             :     /* Microsoft recommends buffer size of UNLEN+1, where UNLEN = 256 */
      52             :     /* "static" variable remains after function exit */
      53             :     static char username[256 + 1];
      54             :     DWORD       len = sizeof(username);
      55             : 
      56             :     *errstr = NULL;
      57             : 
      58             :     if (!GetUserName(username, &len))
      59             :     {
      60             :         *errstr = psprintf(_("user name lookup failure: error code %lu"),
      61             :                            GetLastError());
      62             :         return NULL;
      63             :     }
      64             : 
      65             :     return username;
      66             : #endif
      67             : }
      68             : 
      69             : 
      70             : /*
      71             :  * Returns the current user name in a static buffer or exits
      72             :  */
      73             : const char *
      74         646 : get_user_name_or_exit(const char *progname)
      75             : {
      76             :     const char *user_name;
      77             :     char       *errstr;
      78             : 
      79         646 :     user_name = get_user_name(&errstr);
      80             : 
      81         646 :     if (!user_name)
      82             :     {
      83           0 :         fprintf(stderr, "%s: %s\n", progname, errstr);
      84           0 :         exit(1);
      85             :     }
      86         646 :     return user_name;
      87             : }

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