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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [getpwent.c] - Rev 30
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/* * POSIX 1003.1b - 9.2.2 - User Database Access Routines * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: getpwent.c,v 1.2 2001-09-27 12:01:15 chris Exp $ */ #include <stdio.h> #include <sys/types.h> #include <pwd.h> #include <errno.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <limits.h> #include <fcntl.h> #include <unistd.h> static struct passwd pw_passwd; /* password structure */ static FILE *passwd_fp; /* * The size of these buffers is arbitrary and there is no provision * to protect any of them from overflowing. The scanf patterns * need to be changed to prevent overflowing. In addition, * the limits on these needs to be examined. */ static char logname[8]; static char password[1024]; static char comment[1024]; static char gecos[1024]; static char dir[1024]; static char shell[1024]; /* * Initialize a useable but dummy /etc/passwd * * NOTE: Ignore all errors. * */ static char etc_passwd_initted = 0; void init_etc_passwd_group(void) { FILE *fp; if ( etc_passwd_initted ) return; etc_passwd_initted = 1; (void) mkdir( "/etc", S_IRWXU | S_IRWXG | S_IRWXO ); /* * Initialize /etc/passwd */ if ((fp = fopen ("/etc/passwd", "w")) == NULL) return; fprintf( fp, "root:*:0:0:root,,,,:/tmp:/bin/false\n" "rtems:*:1:1:RTEMS Application,,,,:/tmp:/bin/false\n" ); fclose( fp ); /* * Initialize /etc/group */ if ((fp = fopen ("/etc/group", "w")) == NULL) return; fprintf( fp, "root::0:root\n" "rtems::0:rtems\n" ); fclose( fp ); } int getpwnam_r( const char *name, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result ) { FILE *fp; init_etc_passwd_group(); if ((fp = fopen ("/etc/passwd", "r")) == NULL) { errno = EINVAL; return -1; } while (fgets (buffer, bufsize, fp)) { sscanf (buffer, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%[^:]:%s\n", logname, password, &pwd->pw_uid, &pwd->pw_gid, comment, gecos, dir, shell); pwd->pw_name = logname; pwd->pw_passwd = password; pwd->pw_comment = comment; pwd->pw_gecos = gecos; pwd->pw_dir = dir; pwd->pw_shell = shell; if (!strcmp (logname, name)) { fclose (fp); *result = pwd; return 0; } } fclose (fp); errno = EINVAL; return -1; } struct passwd *getpwnam( const char *name ) { char buf[1024]; struct passwd *p; if ( getpwnam_r( name, &pw_passwd, buf, 1024, &p ) ) return NULL; return p; } int getpwuid_r( uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result ) { FILE *fp; init_etc_passwd_group(); if ((fp = fopen ("/etc/passwd", "r")) == NULL) { errno = EINVAL; return -1; } while (fgets (buffer, bufsize, fp)) { sscanf (buffer, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%[^:]:%s\n", logname, password, &pw_passwd.pw_uid, &pw_passwd.pw_gid, comment, gecos, dir, shell); pwd->pw_name = logname; pwd->pw_passwd = password; pwd->pw_comment = comment; pwd->pw_gecos = gecos; pwd->pw_dir = dir; pwd->pw_shell = shell; if (uid == pwd->pw_uid) { fclose (fp); *result = pwd; return 0; } } fclose (fp); errno = EINVAL; return -1; } struct passwd *getpwuid( uid_t uid ) { char buf[1024]; struct passwd *p; if ( getpwuid_r( uid, &pw_passwd, buf, 1024, &p ) ) return NULL; return p; } struct passwd *getpwent() { char buf[1024]; if (passwd_fp == NULL) return NULL; if (fgets (buf, sizeof (buf), passwd_fp) == NULL) return NULL; sscanf (buf, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%[^:]:%s\n", logname, password, &pw_passwd.pw_uid, &pw_passwd.pw_gid, comment, gecos, dir, shell); pw_passwd.pw_name = logname; pw_passwd.pw_passwd = password; pw_passwd.pw_comment = comment; pw_passwd.pw_gecos = gecos; pw_passwd.pw_dir = dir; pw_passwd.pw_shell = shell; return &pw_passwd; } void setpwent( void ) { init_etc_passwd_group(); if (passwd_fp != NULL) fclose (passwd_fp); passwd_fp = fopen ("/etc/passwd", "r"); } void endpwent( void ) { if (passwd_fp != NULL) fclose (passwd_fp); }
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