X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=libatalk%2Fvfs%2Funix.c;h=5e0588dfd171bf54e9b6b7410c292639aaeabb1b;hb=6d60f95c388da5f8f901d67e0018cf4896e6c6dc;hp=056bdf02f6147da6cca445f922efb197b02c3380;hpb=6dcaba1d633e3cfa96243c62ad8399f7e5558c48;p=netatalk.git diff --git a/libatalk/vfs/unix.c b/libatalk/vfs/unix.c index 056bdf02..5e0588df 100644 --- a/libatalk/vfs/unix.c +++ b/libatalk/vfs/unix.c @@ -1,9 +1,6 @@ /* - * $Id: unix.c,v 1.1 2009-10-02 09:32:41 franklahm Exp $ - * * Copyright (c) 1990,1993 Regents of The University of Michigan. * All Rights Reserved. See COPYRIGHT. - * */ #ifdef HAVE_CONFIG_H @@ -12,6 +9,7 @@ #include #include +#include #include #include #include @@ -22,45 +20,25 @@ #include #include #include +#include +#include +#include /* ----------------------------- a dropbox is a folder where w is set but not r eg: - rwx-wx-wx or rwx-wx-- + rwx-wx-wx or rwx-wx-- rwx----wx (is not asked by a Mac with OS >= 8.0 ?) */ int stickydirmode(const char *name, const mode_t mode, const int dropbox, const mode_t v_umask) { int retval = 0; -#ifdef DROPKLUDGE - /* Turn on the sticky bit if this is a drop box, also turn off the setgid bit */ - if ((dropbox & AFPVOL_DROPBOX)) { - int uid; - - if ( ( (mode & S_IWOTH) && !(mode & S_IROTH)) || - ( (mode & S_IWGRP) && !(mode & S_IRGRP)) ) - { - uid=geteuid(); - if ( seteuid(0) < 0) { - LOG(log_error, logtype_afpd, "stickydirmode: unable to seteuid root: %s", strerror(errno)); - } - if ( (retval=chmod( name, ( (DIRBITS | mode | S_ISVTX) & ~v_umask) )) < 0) { - LOG(log_error, logtype_afpd, "stickydirmode: chmod \"%s\": %s", fullpathname(name), strerror(errno) ); - } else { - LOG(log_debug, logtype_afpd, "stickydirmode: chmod \"%s\": %s", fullpathname(name), strerror(retval) ); - } - seteuid(uid); - return retval; - } - } -#endif /* DROPKLUDGE */ - /* * Ignore EPERM errors: We may be dealing with a directory that is * group writable, in which case chmod will fail. */ - if ( (chmod( name, (DIRBITS | mode) & ~v_umask ) < 0) && errno != EPERM && - !(errno == ENOENT && (dropbox & AFPVOL_NOADOUBLE)) ) + if ( (chmod( name, (DIRBITS | mode) & ~v_umask ) < 0) && errno != EPERM && + !(errno == ENOENT && (dropbox & AFPVOL_NOADOUBLE)) ) { LOG(log_error, logtype_afpd, "stickydirmode: chmod \"%s\": %s", fullpathname(name), strerror(errno) ); retval = -1; @@ -78,33 +56,48 @@ int dir_rx_set(mode_t mode) /* --------------------- */ int setfilmode(const char * name, mode_t mode, struct stat *st, mode_t v_umask) { -struct stat sb; -mode_t mask = S_IRWXU | S_IRWXG | S_IRWXO; /* rwx for owner group and other, by default */ + struct stat sb; + mode_t mask = S_IRWXU | S_IRWXG | S_IRWXO; /* rwx for owner group and other, by default */ if (!st) { - if (stat(name, &sb) != 0) + if (lstat(name, &sb) != 0) return -1; st = &sb; } - - mode |= st->st_mode & ~mask; /* keep other bits from previous mode */ - if ( chmod( name, mode & ~v_umask ) < 0 && errno != EPERM ) { - return -1; - } - return 0; + + if (S_ISLNK(st->st_mode)) + return 0; /* we don't want to change link permissions */ + + mode |= st->st_mode & ~mask; /* keep other bits from previous mode */ + + if ( chmod( name, mode & ~v_umask ) < 0 && errno != EPERM ) { + return -1; + } + return 0; } -/* ------------------- - system rmdir with afp error code. - ENOENT is not an error. +/* + * @brief system rmdir with afp error code. + * + * Supports *at semantics (cf openat) if HAVE_ATFUNCS. Pass dirfd=-1 to ignore this. */ -int netatalk_rmdir(const char *name) +int netatalk_rmdir_all_errors(int dirfd, const char *name) { - if (rmdir(name) < 0) { + int err; + +#ifdef HAVE_ATFUNCS + if (dirfd == -1) + dirfd = AT_FDCWD; + err = unlinkat(dirfd, name, AT_REMOVEDIR); +#else + err = rmdir(name); +#endif + + if (err < 0) { switch ( errno ) { case ENOENT : - break; - case ENOTEMPTY : + return AFPERR_NOOBJ; + case ENOTEMPTY : return AFPERR_DIRNEMPT; case EPERM: case EACCES : @@ -118,10 +111,23 @@ int netatalk_rmdir(const char *name) return AFP_OK; } +/* + * @brief System rmdir with afp error code, but ENOENT is not an error. + * + * Supports *at semantics (cf openat) if HAVE_ATFUNCS. Pass dirfd=-1 to ignore this. + */ +int netatalk_rmdir(int dirfd, const char *name) +{ + int ret = netatalk_rmdir_all_errors(dirfd, name); + if (ret == AFPERR_NOOBJ) + return AFP_OK; + return ret; +} + /* ------------------- system unlink with afp error code. ENOENT is not an error. - */ +*/ int netatalk_unlink(const char *name) { if (unlink(name) < 0) { @@ -153,3 +159,223 @@ char *fullpathname(const char *name) } return wd; } + + +/************************************************************************** + * *at semnatics support functions (like openat, renameat standard funcs) + **************************************************************************/ + +/* + * Supports *at semantics if HAVE_ATFUNCS, pass dirfd=-1 to ignore this + */ +int copy_file(int dirfd, const char *src, const char *dst, mode_t mode) +{ + int ret = 0; + int sfd = -1; + int dfd = -1; + ssize_t cc; + size_t buflen; + char filebuf[8192]; + +#ifdef HAVE_ATFUNCS + if (dirfd == -1) + dirfd = AT_FDCWD; + sfd = openat(dirfd, src, O_RDONLY); +#else + sfd = open(src, O_RDONLY); +#endif + if (sfd < 0) { + LOG(log_error, logtype_afpd, "copy_file('%s'/'%s'): open '%s' error: %s", + src, dst, src, strerror(errno)); + return -1; + } + + if ((dfd = open(dst, O_WRONLY | O_CREAT | O_TRUNC, mode)) < 0) { + LOG(log_error, logtype_afpd, "copy_file('%s'/'%s'): open '%s' error: %s", + src, dst, dst, strerror(errno)); + ret = -1; + goto exit; + } + + while ((cc = read(sfd, filebuf, sizeof(filebuf)))) { + if (cc < 0) { + if (errno == EINTR) + continue; + LOG(log_error, logtype_afpd, "copy_file('%s'/'%s'): read '%s' error: %s", + src, dst, src, strerror(errno)); + ret = -1; + goto exit; + } + + buflen = cc; + while (buflen > 0) { + if ((cc = write(dfd, filebuf, buflen)) < 0) { + if (errno == EINTR) + continue; + LOG(log_error, logtype_afpd, "copy_file('%s'/'%s'): read '%s' error: %s", + src, dst, dst, strerror(errno)); + ret = -1; + goto exit; + } + buflen -= cc; + } + } + +exit: + if (sfd != -1) + close(sfd); + + if (dfd != -1) { + int err; + + err = close(dfd); + if (!ret && err) { + /* don't bother to report an error if there's already one */ + LOG(log_error, logtype_afpd, "copy_file('%s'/'%s'): close '%s' error: %s", + src, dst, dst, strerror(errno)); + ret = -1; + } + } + + return ret; +} + +/* + * at wrapper for netatalk_unlink + */ +int netatalk_unlinkat(int dirfd, const char *name) +{ +#ifdef HAVE_ATFUNCS + if (dirfd == -1) + dirfd = AT_FDCWD; + + if (unlinkat(dirfd, name, 0) < 0) { + switch (errno) { + case ENOENT : + break; + case EROFS: + return AFPERR_VLOCK; + case EPERM: + case EACCES : + return AFPERR_ACCESS; + default : + return AFPERR_PARAM; + } + } + return AFP_OK; +#else + return netatalk_unlink(name); +#endif + + /* DEADC0DE */ + return 0; +} + +/* + * @brief This is equivalent of unix rename() + * + * unix_rename mulitplexes rename and renameat. If we dont HAVE_ATFUNCS, sfd and dfd + * are ignored. + * + * @param sfd (r) if we HAVE_ATFUNCS, -1 gives AT_FDCWD + * @param oldpath (r) guess what + * @param dfd (r) same as sfd + * @param newpath (r) guess what + */ +int unix_rename(int sfd, const char *oldpath, int dfd, const char *newpath) +{ +#ifdef HAVE_ATFUNCS + if (sfd == -1) + sfd = AT_FDCWD; + if (dfd == -1) + dfd = AT_FDCWD; + + if (renameat(sfd, oldpath, dfd, newpath) < 0) + return -1; +#else + if (rename(oldpath, newpath) < 0) + return -1; +#endif /* HAVE_ATFUNCS */ + + return 0; +} + +/* + * @brief stat/fsstatat multiplexer + * + * statat mulitplexes stat and fstatat. If we dont HAVE_ATFUNCS, dirfd is ignored. + * + * @param dirfd (r) Only used if HAVE_ATFUNCS, ignored else, -1 gives AT_FDCWD + * @param path (r) pathname + * @param st (rw) pointer to struct stat + */ +int statat(int dirfd, const char *path, struct stat *st) +{ +#ifdef HAVE_ATFUNCS + if (dirfd == -1) + dirfd = AT_FDCWD; + return (fstatat(dirfd, path, st, 0)); +#else + return (stat(path, st)); +#endif + + /* DEADC0DE */ + return -1; +} + +/* + * @brief lstat/fsstatat multiplexer + * + * lstatat mulitplexes lstat and fstatat. If we dont HAVE_ATFUNCS, dirfd is ignored. + * + * @param dirfd (r) Only used if HAVE_ATFUNCS, ignored else, -1 gives AT_FDCWD + * @param path (r) pathname + * @param st (rw) pointer to struct stat + */ +int lstatat(int dirfd, const char *path, struct stat *st) +{ +#ifdef HAVE_ATFUNCS + if (dirfd == -1) + dirfd = AT_FDCWD; + return (fstatat(dirfd, path, st, AT_SYMLINK_NOFOLLOW)); +#else + return (lstat(path, st)); +#endif + + /* DEADC0DE */ + return -1; +} + +/* + * @brief opendir wrapper for *at semantics support + * + * opendirat chdirs to dirfd if dirfd != -1 before calling opendir on path. + * + * @param dirfd (r) if != -1, chdir(dirfd) before opendir(path) + * @param path (r) pathname + */ +DIR *opendirat(int dirfd, const char *path) +{ + DIR *ret; + int cwd = -1; + + if (dirfd != -1) { + if (((cwd = open(".", O_RDONLY)) == -1) || (fchdir(dirfd) != 0)) { + ret = NULL; + goto exit; + } + } + + ret = opendir(path); + + if (dirfd != -1 && fchdir(cwd) != 0) { + LOG(log_error, logtype_afpd, "opendirat: cant chdir back. exit!"); + exit(EXITERR_SYS); + } + +exit: + if (cwd != -1) + close(cwd); + + return ret; +}