/*++ /* NAME /* dot_lockfile_as 3 /* SUMMARY /* dotlock file as user /* SYNOPSIS /* #include <dot_lockfile_as.h> /* /* int dot_lockfile_as(path, why, euid, egid) /* const char *path; /* VSTRING *why; /* uid_t euid; /* gid_t egid; /* /* void dot_unlockfile_as(path, euid, egid) /* const char *path; /* uid_t euid; /* gid_t egid; /* DESCRIPTION /* dot_lockfile_as() and dot_unlockfile_as() are wrappers around /* the dot_lockfile() and dot_unlockfile() routines. The routines /* change privilege to the designated privilege, perform the /* requested operation, and restore privileges. /* DIAGNOSTICS /* Fatal error: no permission to change privilege level. /* SEE ALSO /* dot_lockfile(3) dotlock file management /* set_eugid(3) switch effective rights /* LICENSE /* .ad /* .fi /* The Secure Mailer license must be distributed with this software. /* AUTHOR(S) /* Wietse Venema /* IBM T.J. Watson Research /* P.O. Box 704 /* Yorktown Heights, NY 10598, USA /*--*/ /* System library. */ #include <sys_defs.h> #include <unistd.h> /* Utility library. */ #include "msg.h" #include "set_eugid.h" #include "dot_lockfile.h" #include "dot_lockfile_as.h" /* dot_lockfile_as - dotlock file as user */ int dot_lockfile_as(const char *path, VSTRING *why, uid_t euid, gid_t egid) { uid_t saved_euid = geteuid(); gid_t saved_egid = getegid(); int result; /* * Switch to the target user privileges. */ set_eugid(euid, egid); /* * Lock that file. */ result = dot_lockfile(path, why); /* * Restore saved privileges. */ set_eugid(saved_euid, saved_egid); return (result); } /* dot_unlockfile_as - dotlock file as user */ void dot_unlockfile_as(const char *path, uid_t euid, gid_t egid) { uid_t saved_euid = geteuid(); gid_t saved_egid = getegid(); /* * Switch to the target user privileges. */ set_eugid(euid, egid); /* * Lock that file. */ dot_unlockfile(path); /* * Restore saved privileges. */ set_eugid(saved_euid, saved_egid); }