#include <stdint.h>
#include <stdio_ext.h>
#include <stdlib.h>
-#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "hexdecoct.h"
#include "log.h"
#include "macro.h"
-#include "missing.h"
#include "mkdir.h"
#include "parse-util.h"
#include "path-util.h"
+#include "socket-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "tmpfile-util.h"
return 0;
}
+int take_fdopen_unlocked(int *fd, const char *options, FILE **ret) {
+ int r;
+
+ assert(fd);
+
+ r = fdopen_unlocked(*fd, options, ret);
+ if (r < 0)
+ return r;
+
+ *fd = -1;
+
+ return 0;
+}
+
+FILE* take_fdopen(int *fd, const char *options) {
+ assert(fd);
+
+ FILE *f = fdopen(*fd, options);
+ if (!f)
+ return NULL;
+
+ *fd = -1;
+
+ return f;
+}
+
+DIR* take_fdopendir(int *dfd) {
+ assert(dfd);
+
+ DIR *d = fdopendir(*dfd);
+ if (!d)
+ return NULL;
+
+ *dfd = -1;
+
+ return d;
+}
+
FILE* open_memstream_unlocked(char **ptr, size_t *sizeloc) {
FILE *f = open_memstream(ptr, sizeloc);
if (!f)
struct timespec *ts) {
bool needs_nl;
- int r;
+ int r, fd;
assert(f);
assert(line);
if (ferror(f))
return -EIO;
+ if (ts) {
+ /* If we shall set the timestamp we need the fd. But fmemopen() streams generally don't have
+ * an fd. Let's fail early in that case. */
+ fd = fileno(f);
+ if (fd < 0)
+ return -EBADF;
+ }
+
needs_nl = !(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n");
if (needs_nl && (flags & WRITE_STRING_FILE_DISABLE_BUFFER)) {
if (ts) {
struct timespec twice[2] = {*ts, *ts};
- if (futimens(fileno(f), twice) < 0)
+ if (futimens(fd, twice) < 0)
return -errno;
}
assert(fn);
assert(line);
+ /* Note that we'd really like to use O_TMPFILE here, but can't really, since we want replacement
+ * semantics here, and O_TMPFILE can't offer that. i.e. rename() replaces but linkat() doesn't. */
+
r = fopen_temporary(fn, &f, &p);
if (r < 0)
return r;
- (void) fchmod_umask(fileno(f), 0644);
-
r = write_string_stream_ts(f, line, flags, ts);
if (r < 0)
goto fail;
+ r = fchmod_umask(fileno(f), FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 : 0644);
+ if (r < 0)
+ goto fail;
+
if (rename(p, fn) < 0) {
r = -errno;
goto fail;
}
+ if (FLAGS_SET(flags, WRITE_STRING_FILE_SYNC)) {
+ /* Sync the rename, too */
+ r = fsync_directory_of_file(fileno(f));
+ if (r < 0)
+ return r;
+ }
+
return 0;
fail:
struct timespec *ts) {
_cleanup_fclose_ FILE *f = NULL;
- int q, r;
+ int q, r, fd;
assert(fn);
assert(line);
} else
assert(!ts);
- if (flags & WRITE_STRING_FILE_CREATE) {
- r = fopen_unlocked(fn, "we", &f);
- if (r < 0)
- goto fail;
- } else {
- int fd;
-
- /* We manually build our own version of fopen(..., "we") that
- * works without O_CREAT */
- fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY | ((flags & WRITE_STRING_FILE_NOFOLLOW) ? O_NOFOLLOW : 0));
- if (fd < 0) {
- r = -errno;
- goto fail;
- }
+ /* We manually build our own version of fopen(..., "we") that works without O_CREAT and with O_NOFOLLOW if needed. */
+ fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY |
+ (FLAGS_SET(flags, WRITE_STRING_FILE_NOFOLLOW) ? O_NOFOLLOW : 0) |
+ (FLAGS_SET(flags, WRITE_STRING_FILE_CREATE) ? O_CREAT : 0),
+ (FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 : 0666));
+ if (fd < 0) {
+ r = -errno;
+ goto fail;
+ }
- r = fdopen_unlocked(fd, "w", &f);
- if (r < 0) {
- safe_close(fd);
- goto fail;
- }
+ r = fdopen_unlocked(fd, "w", &f);
+ if (r < 0) {
+ safe_close(fd);
+ goto fail;
}
if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
return 1;
}
+int read_full_virtual_file(const char *filename, char **ret_contents, size_t *ret_size) {
+ _cleanup_free_ char *buf = NULL;
+ _cleanup_close_ int fd = -1;
+ struct stat st;
+ size_t n, size;
+ int n_retries;
+ char *p;
+
+ assert(ret_contents);
+
+ /* Virtual filesystems such as sysfs or procfs use kernfs, and kernfs can work
+ * with two sorts of virtual files. One sort uses "seq_file", and the results of
+ * the first read are buffered for the second read. The other sort uses "raw"
+ * reads which always go direct to the device. In the latter case, the content of
+ * the virtual file must be retrieved with a single read otherwise a second read
+ * might get the new value instead of finding EOF immediately. That's the reason
+ * why the usage of fread(3) is prohibited in this case as it always performs a
+ * second call to read(2) looking for EOF. See issue 13585. */
+
+ fd = open(filename, O_RDONLY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ /* Start size for files in /proc which usually report a file size of 0. */
+ size = LINE_MAX / 2;
+
+ /* Limit the number of attempts to read the number of bytes returned by fstat(). */
+ n_retries = 3;
+
+ for (;;) {
+ if (n_retries <= 0)
+ return -EIO;
+
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ if (!S_ISREG(st.st_mode))
+ return -EBADF;
+
+ /* Be prepared for files from /proc which generally report a file size of 0. */
+ if (st.st_size > 0) {
+ size = st.st_size;
+ n_retries--;
+ } else
+ size = size * 2;
+
+ if (size > READ_FULL_BYTES_MAX)
+ return -E2BIG;
+
+ p = realloc(buf, size + 1);
+ if (!p)
+ return -ENOMEM;
+ buf = TAKE_PTR(p);
+
+ for (;;) {
+ ssize_t k;
+
+ /* Read one more byte so we can detect whether the content of the
+ * file has already changed or the guessed size for files from /proc
+ * wasn't large enough . */
+ k = read(fd, buf, size + 1);
+ if (k >= 0) {
+ n = k;
+ break;
+ }
+
+ if (errno != EINTR)
+ return -errno;
+ }
+
+ /* Consider a short read as EOF */
+ if (n <= size)
+ break;
+
+ /* Hmm... either we read too few bytes from /proc or less likely the content
+ * of the file might have been changed (and is now bigger) while we were
+ * processing, let's try again either with a bigger guessed size or the new
+ * file size. */
+
+ if (lseek(fd, 0, SEEK_SET) < 0)
+ return -errno;
+ }
+
+ if (n < size) {
+ p = realloc(buf, n + 1);
+ if (!p)
+ return -ENOMEM;
+ buf = TAKE_PTR(p);
+ }
+
+ if (!ret_size) {
+ /* Safety check: if the caller doesn't want to know the size of what we
+ * just read it will rely on the trailing NUL byte. But if there's an
+ * embedded NUL byte, then we should refuse operation as otherwise
+ * there'd be ambiguity about what we just read. */
+
+ if (memchr(buf, 0, n))
+ return -EBADMSG;
+ } else
+ *ret_size = n;
+
+ buf[n] = 0;
+ *ret_contents = TAKE_PTR(buf);
+
+ return 0;
+}
+
int read_full_stream_full(
FILE *f,
const char *filename,
assert(f);
assert(ret_contents);
assert(!FLAGS_SET(flags, READ_FULL_FILE_UNBASE64 | READ_FULL_FILE_UNHEX));
- assert(!(flags & (READ_FULL_FILE_UNBASE64 | READ_FULL_FILE_UNHEX)) || ret_size);
n_next = LINE_MAX; /* Start size */
fd = fileno(f);
- if (fd >= 0) { /* If the FILE* object is backed by an fd (as opposed to memory or such, see fmemopen(), let's
- * optimize our buffering) */
+ if (fd >= 0) { /* If the FILE* object is backed by an fd (as opposed to memory or such, see fmemopen()), let's
+ * optimize our buffering */
if (fstat(fd, &st) < 0)
return -errno;
if (st.st_size > READ_FULL_BYTES_MAX)
return -E2BIG;
- /* Start with the right file size, but be prepared for files from /proc which generally report a file
- * size of 0. Note that we increase the size to read here by one, so that the first read attempt
- * already makes us notice the EOF. */
+ /* Start with the right file size. Note that we increase the size
+ * to read here by one, so that the first read attempt already
+ * makes us notice the EOF. */
if (st.st_size > 0)
n_next = st.st_size + 1;
- if (flags & READ_FULL_FILE_SECURE)
+ if (flags & READ_FULL_FILE_WARN_WORLD_READABLE)
(void) warn_file_is_world_accessible(filename, &st, NULL, 0);
}
}
errno = 0;
k = fread(buf + l, 1, n - l, f);
- if (k > 0)
- l += k;
+
+ assert(k <= n - l);
+ l += k;
if (ferror(f)) {
r = errno_or_else(EIO);
goto finalize;
}
-
if (feof(f))
break;
- /* We aren't expecting fread() to return a short read outside
- * of (error && eof), assert buffer is full and enlarge buffer.
- */
- assert(l == n);
+ assert(k > 0); /* we can't have read zero bytes because that would have been EOF */
/* Safety check */
if (n >= READ_FULL_BYTES_MAX) {
}
if (flags & (READ_FULL_FILE_UNBASE64 | READ_FULL_FILE_UNHEX)) {
+ _cleanup_free_ void *decoded = NULL;
+ size_t decoded_size;
+
buf[l++] = 0;
if (flags & READ_FULL_FILE_UNBASE64)
- r = unbase64mem_full(buf, l, flags & READ_FULL_FILE_SECURE, (void **) ret_contents, ret_size);
+ r = unbase64mem_full(buf, l, flags & READ_FULL_FILE_SECURE, &decoded, &decoded_size);
else
- r = unhexmem_full(buf, l, flags & READ_FULL_FILE_SECURE, (void **) ret_contents, ret_size);
- goto finalize;
+ r = unhexmem_full(buf, l, flags & READ_FULL_FILE_SECURE, &decoded, &decoded_size);
+ if (r < 0)
+ goto finalize;
+
+ if (flags & READ_FULL_FILE_SECURE)
+ explicit_bzero_safe(buf, n);
+ free_and_replace(buf, decoded);
+ n = l = decoded_size;
}
if (!ret_size) {
return r;
}
-int read_full_file_full(const char *filename, ReadFullFileFlags flags, char **contents, size_t *size) {
+int read_full_file_full(int dir_fd, const char *filename, ReadFullFileFlags flags, char **contents, size_t *size) {
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(filename);
assert(contents);
- r = fopen_unlocked(filename, "re", &f);
- if (r < 0)
- return r;
+ r = xfopenat(dir_fd, filename, "re", 0, &f);
+ if (r < 0) {
+ _cleanup_close_ int dfd = -1, sk = -1;
+ union sockaddr_union sa;
+
+ /* ENXIO is what Linux returns if we open a node that is an AF_UNIX socket */
+ if (r != -ENXIO)
+ return r;
+
+ /* If this is enabled, let's try to connect to it */
+ if (!FLAGS_SET(flags, READ_FULL_FILE_CONNECT_SOCKET))
+ return -ENXIO;
+
+ if (dir_fd == AT_FDCWD)
+ r = sockaddr_un_set_path(&sa.un, filename);
+ else {
+ char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
+
+ /* If we shall operate relative to some directory, then let's use O_PATH first to
+ * open the socket inode, and then connect to it via /proc/self/fd/. We have to do
+ * this since there's not connectat() that takes a directory fd as first arg. */
+
+ dfd = openat(dir_fd, filename, O_PATH|O_CLOEXEC);
+ if (dfd < 0)
+ return -errno;
+
+ xsprintf(procfs_path, "/proc/self/fd/%i", dfd);
+ r = sockaddr_un_set_path(&sa.un, procfs_path);
+ }
+ if (r < 0)
+ return r;
+
+ sk = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
+ if (sk < 0)
+ return -errno;
+
+ if (connect(sk, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
+ return errno == ENOTSOCK ? -ENXIO : -errno; /* propagate original error if this is
+ * not a socket after all */
+
+ if (shutdown(sk, SHUT_WR) < 0)
+ return -errno;
+
+ f = fdopen(sk, "r");
+ if (!f)
+ return -errno;
+
+ TAKE_FD(sk);
+ }
+
+ (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
return read_full_stream_full(f, filename, flags, contents, size);
}
assert(pattern);
assert(field);
- r = read_full_file(filename, &status, NULL);
+ r = read_full_virtual_file(filename, &status, NULL);
if (r < 0)
return r;
return d;
}
+static int mode_to_flags(const char *mode) {
+ const char *p;
+ int flags;
+
+ if ((p = startswith(mode, "r+")))
+ flags = O_RDWR;
+ else if ((p = startswith(mode, "r")))
+ flags = O_RDONLY;
+ else if ((p = startswith(mode, "w+")))
+ flags = O_RDWR|O_CREAT|O_TRUNC;
+ else if ((p = startswith(mode, "w")))
+ flags = O_WRONLY|O_CREAT|O_TRUNC;
+ else if ((p = startswith(mode, "a+")))
+ flags = O_RDWR|O_CREAT|O_APPEND;
+ else if ((p = startswith(mode, "a")))
+ flags = O_WRONLY|O_CREAT|O_APPEND;
+ else
+ return -EINVAL;
+
+ for (; *p != 0; p++) {
+
+ switch (*p) {
+
+ case 'e':
+ flags |= O_CLOEXEC;
+ break;
+
+ case 'x':
+ flags |= O_EXCL;
+ break;
+
+ case 'm':
+ /* ignore this here, fdopen() might care later though */
+ break;
+
+ case 'c': /* not sure what to do about this one */
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return flags;
+}
+
+int xfopenat(int dir_fd, const char *path, const char *mode, int flags, FILE **ret) {
+ FILE *f;
+
+ /* A combination of fopen() with openat() */
+
+ if (dir_fd == AT_FDCWD && flags == 0) {
+ f = fopen(path, mode);
+ if (!f)
+ return -errno;
+ } else {
+ int fd, mode_flags;
+
+ mode_flags = mode_to_flags(mode);
+ if (mode_flags < 0)
+ return mode_flags;
+
+ fd = openat(dir_fd, path, mode_flags | flags);
+ if (fd < 0)
+ return -errno;
+
+ f = fdopen(fd, mode);
+ if (!f) {
+ safe_close(fd);
+ return -errno;
+ }
+ }
+
+ *ret = f;
+ return 0;
+}
+
static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
char **i;
}
int fflush_sync_and_check(FILE *f) {
- int r;
+ int r, fd;
assert(f);
if (r < 0)
return r;
- if (fsync(fileno(f)) < 0)
+ /* Not all file streams have an fd associated (think: fmemopen()), let's handle this gracefully and
+ * assume that in that case we need no explicit syncing */
+ fd = fileno(f);
+ if (fd < 0)
+ return 0;
+
+ if (fsync(fd) < 0)
return -errno;
- r = fsync_directory_of_file(fileno(f));
+ r = fsync_directory_of_file(fd);
if (r < 0)
return r;
int read_line_full(FILE *f, size_t limit, ReadLineFlags flags, char **ret) {
size_t n = 0, allocated = 0, count = 0;
_cleanup_free_ char *buffer = NULL;
- int r, tty = -1;
+ int r;
assert(f);
count++;
if (eol != EOL_NONE) {
- /* If we are on a tty, we can't wait for more input. But we expect only
- * \n as the single EOL marker, so there is no need to wait. We check
- * this condition last to avoid isatty() check if not necessary. */
-
- if (tty < 0)
- tty = isatty(fileno(f));
- if (tty > 0)
+ /* If we are on a tty, we can't shouldn't wait for more input, because that
+ * generally means waiting for the user, interactively. In the case of a TTY
+ * we expect only \n as the single EOL marker, so we are in the lucky
+ * position that there is no need to wait. We check this condition last, to
+ * avoid isatty() check if not necessary. */
+
+ if ((flags & (READ_LINE_IS_A_TTY|READ_LINE_NOT_A_TTY)) == 0) {
+ int fd;
+
+ fd = fileno(f);
+ if (fd < 0) /* Maybe an fmemopen() stream? Handle this gracefully,
+ * and don't call isatty() on an invalid fd */
+ flags |= READ_LINE_NOT_A_TTY;
+ else
+ flags |= isatty(fd) ? READ_LINE_IS_A_TTY : READ_LINE_NOT_A_TTY;
+ }
+ if (FLAGS_SET(flags, READ_LINE_IS_A_TTY))
break;
}
filename, st->st_mode & 07777);
return 0;
}
+
+int sync_rights(int from, int to) {
+ struct stat st;
+
+ if (fstat(from, &st) < 0)
+ return -errno;
+
+ return fchmod_and_chown(to, st.st_mode & 07777, st.st_uid, st.st_gid);
+}
+
+int rename_and_apply_smack_floor_label(const char *from, const char *to) {
+ int r = 0;
+ if (rename(from, to) < 0)
+ return -errno;
+
+#ifdef SMACK_RUN_LABEL
+ r = mac_smack_apply(to, SMACK_ATTR_ACCESS, SMACK_FLOOR_LABEL);
+ if (r < 0)
+ return r;
+#endif
+ return r;
+}
projects / thirdparty / systemd.git / blobdiff