153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/*
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SST_User_POSIX.c
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Author: Patrick Baggett <ptb1@762studios.com>
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Created: 12/23/2011
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Purpose:
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libsst-os user account information functions for POSIX platforms
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License:
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This program is free software. It comes without any warranty, to
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the extent permitted by applicable law. You can redistribute it
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and/or modify it under the terms of the Do What The Fuck You Want
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To Public License, Version 2, as published by Sam Hocevar. See
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http://sam.zoy.org/wtfpl/COPYING for more details.
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*/
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <string.h>
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int __libsst_init_user() { return 1; }
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/******************************************************************************/
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int SST_OS_GetUserName(char* usernameReturn, int bufferSize)
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{
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uid_t euid;
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struct passwd pwd;
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struct passwd* ptrpwd = NULL;
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char buf[1024];
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int len;
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/* Here we using the POSIX '95 extension for reentrant functions */
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euid = geteuid();
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if(getpwuid_r(euid, &pwd, buf, sizeof(buf), &ptrpwd) != 0)
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return -1;
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/* getpwuid_r() will return 0 to indicate success, but it does not indicate that a matching
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record was found, just that the arguments weren't incorrect. Check if *ptrpwd is still NULL,
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which means the record wasn't found. */
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if(ptrpwd == NULL)
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return 0;
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len = (int)strlen(pwd.pw_name);
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/* Is the user just querying the length? */
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if(usernameReturn == NULL)
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return len;
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/* Expected case: (more than) enough space -> just do strcpy() */
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if(bufferSize >= len+1)
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{
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strcpy(usernameReturn, pwd.pw_name);
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return len;
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}
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/* Exceptional case: less than enough space. Copy 'bufferSize'-1 characters, then add NULL terminator. */
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memcpy(usernameReturn, pwd.pw_name, bufferSize-1);
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usernameReturn[bufferSize-1] = 0;
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return len;
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}
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/******************************************************************************/
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int SST_OS_GetUserRealName(char* realnameReturn, int bufferSize)
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{
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uid_t euid;
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struct passwd pwd;
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struct passwd* ptrpwd = NULL;
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char buf[1024];
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int len;
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/* Here we using the POSIX '95 extension for reentrant functions */
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euid = geteuid();
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if(getpwuid_r(euid, &pwd, buf, sizeof(buf), &ptrpwd) != 0)
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return -1;
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/* getpwuid_r() will return 0 to indicate success, but it does not indicate that a matching
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record was found, just that the arguments weren't incorrect. Check if *ptrpwd is still NULL,
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which means the record wasn't found. */
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if(ptrpwd == NULL)
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return 0;
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len = (int)strlen(pwd.pw_gecos);
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/* Is the user just querying the length? */
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if(realnameReturn == NULL)
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return len;
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/* Expected case: (more than) enough space -> just do strcpy() */
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if(bufferSize >= len+1)
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{
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strcpy(realnameReturn, pwd.pw_gecos);
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return len;
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}
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/* Exceptional case: less than enough space. Copy 'bufferSize'-1 characters, then add NULL terminator. */
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memcpy(realnameReturn, pwd.pw_gecos, bufferSize-1);
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realnameReturn[bufferSize-1] = 0;
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return len;
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}
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/******************************************************************************/
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int SST_OS_GetUserHomeDirectory(char* homedirReturn, int bufferSize)
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{
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uid_t euid;
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struct passwd pwd;
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struct passwd* ptrpwd = NULL;
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char buf[1024];
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int len;
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/* Here we using the POSIX '95 extension for reentrant functions */
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euid = geteuid();
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if(getpwuid_r(euid, &pwd, buf, sizeof(buf), &ptrpwd) != 0)
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return -1;
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/* getpwuid_r() will return 0 to indicate success, but it does not indicate that a matching
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record was found, just that the arguments weren't incorrect. Check if *ptrpwd is still NULL,
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which means the record wasn't found. */
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if(ptrpwd == NULL)
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return 0;
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len = (int)strlen(pwd.pw_dir);
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/* Is the user just querying the length? */
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if(homedirReturn == NULL)
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return len;
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/* Expected case: (more than) enough space -> just do strcpy() */
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if(bufferSize >= len+1)
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{
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strcpy(homedirReturn, pwd.pw_dir);
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return len;
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}
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/* Exceptional case: less than enough space. Copy 'bufferSize'-1 characters, then add NULL terminator. */
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memcpy(homedirReturn, pwd.pw_dir, bufferSize-1);
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homedirReturn[bufferSize-1] = 0;
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return len;
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}
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