diff options
Diffstat (limited to 'usr/src/lib/libast/common/comp/eaccess.c')
| -rw-r--r-- | usr/src/lib/libast/common/comp/eaccess.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/usr/src/lib/libast/common/comp/eaccess.c b/usr/src/lib/libast/common/comp/eaccess.c new file mode 100644 index 0000000000..3604fe835f --- /dev/null +++ b/usr/src/lib/libast/common/comp/eaccess.c @@ -0,0 +1,139 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * access() euid/egid implementation + */ + +#include <ast.h> +#include <errno.h> +#include <ls.h> + +#include "FEATURE/eaccess" + +#if _lib_eaccess + +NoN(eaccess) + +#else + +#if defined(__EXPORT__) +#define extern __EXPORT__ +#endif + +extern int +eaccess(const char* path, register int flags) +{ +#ifdef EFF_ONLY_OK + return access(path, flags|EFF_ONLY_OK); +#else +#if _lib_euidaccess + return euidaccess(path, flags); +#else + register int mode; + struct stat st; + + static int init; + static uid_t ruid; + static uid_t euid; + static gid_t rgid; + static gid_t egid; + + if (!init) + { + ruid = getuid(); + euid = geteuid(); + rgid = getgid(); + egid = getegid(); + init = (ruid == euid && rgid == egid) ? 1 : -1; + } + if (init > 0 || flags == F_OK) + return access(path, flags); + if (stat(path, &st)) + return -1; + mode = 0; + if (euid == 0) + { + if (!S_ISREG(st.st_mode) || !(flags & X_OK) || (st.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH))) + return 0; + goto nope; + } + else if (euid == st.st_uid) + { + if (flags & R_OK) + mode |= S_IRUSR; + if (flags & W_OK) + mode |= S_IWUSR; + if (flags & X_OK) + mode |= S_IXUSR; + } + else if (egid == st.st_gid) + { +#if _lib_getgroups + setgroup: +#endif + if (flags & R_OK) + mode |= S_IRGRP; + if (flags & W_OK) + mode |= S_IWGRP; + if (flags & X_OK) + mode |= S_IXGRP; + } + else + { +#if _lib_getgroups + register int n; + + static int ngroups = -2; + static gid_t* groups; + + if (ngroups == -2) + { + if ((ngroups = getgroups(0, (gid_t*)0)) <= 0) + ngroups = NGROUPS_MAX; + if (!(groups = newof(0, gid_t, ngroups + 1, 0))) + ngroups = -1; + else + ngroups = getgroups(ngroups, groups); + } + n = ngroups; + while (--n >= 0) + if (groups[n] == st.st_gid) + goto setgroup; +#endif + if (flags & R_OK) + mode |= S_IROTH; + if (flags & W_OK) + mode |= S_IWOTH; + if (flags & X_OK) + mode |= S_IXOTH; + } + if ((st.st_mode & mode) == mode) + return 0; + nope: + errno = EACCES; + return -1; +#endif +#endif +} + +#endif |