1300 lines
38 KiB
C
1300 lines
38 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "hexdecoct.h"
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#include "log.h"
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#include "macro.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "socket-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "tmpfile-util.h"
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#define READ_FULL_BYTES_MAX (4U*1024U*1024U)
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int fopen_unlocked(const char *path, const char *options, FILE **ret) {
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assert(ret);
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FILE *f = fopen(path, options);
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if (!f)
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return -errno;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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*ret = f;
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return 0;
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}
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int fdopen_unlocked(int fd, const char *options, FILE **ret) {
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assert(ret);
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FILE *f = fdopen(fd, options);
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if (!f)
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return -errno;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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*ret = f;
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return 0;
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}
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int take_fdopen_unlocked(int *fd, const char *options, FILE **ret) {
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int r;
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assert(fd);
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r = fdopen_unlocked(*fd, options, ret);
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if (r < 0)
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return r;
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*fd = -1;
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return 0;
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}
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FILE* take_fdopen(int *fd, const char *options) {
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assert(fd);
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FILE *f = fdopen(*fd, options);
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if (!f)
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return NULL;
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*fd = -1;
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return f;
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}
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DIR* take_fdopendir(int *dfd) {
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assert(dfd);
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DIR *d = fdopendir(*dfd);
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if (!d)
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return NULL;
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*dfd = -1;
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return d;
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}
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FILE* open_memstream_unlocked(char **ptr, size_t *sizeloc) {
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FILE *f = open_memstream(ptr, sizeloc);
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if (!f)
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return NULL;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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return f;
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}
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FILE* fmemopen_unlocked(void *buf, size_t size, const char *mode) {
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FILE *f = fmemopen(buf, size, mode);
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if (!f)
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return NULL;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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return f;
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}
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int write_string_stream_ts(
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FILE *f,
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const char *line,
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WriteStringFileFlags flags,
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struct timespec *ts) {
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bool needs_nl;
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int r, fd;
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assert(f);
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assert(line);
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if (ferror(f))
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return -EIO;
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if (ts) {
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/* If we shall set the timestamp we need the fd. But fmemopen() streams generally don't have
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* an fd. Let's fail early in that case. */
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fd = fileno(f);
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if (fd < 0)
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return -EBADF;
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}
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needs_nl = !(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n");
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if (needs_nl && (flags & WRITE_STRING_FILE_DISABLE_BUFFER)) {
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/* If STDIO buffering was disabled, then let's append the newline character to the string itself, so
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* that the write goes out in one go, instead of two */
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line = strjoina(line, "\n");
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needs_nl = false;
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}
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if (fputs(line, f) == EOF)
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return -errno;
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if (needs_nl)
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if (fputc('\n', f) == EOF)
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return -errno;
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if (flags & WRITE_STRING_FILE_SYNC)
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r = fflush_sync_and_check(f);
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else
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r = fflush_and_check(f);
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if (r < 0)
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return r;
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if (ts) {
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struct timespec twice[2] = {*ts, *ts};
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if (futimens(fd, twice) < 0)
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return -errno;
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}
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return 0;
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}
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static int write_string_file_atomic(
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const char *fn,
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const char *line,
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WriteStringFileFlags flags,
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struct timespec *ts) {
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_free_ char *p = NULL;
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int r;
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assert(fn);
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assert(line);
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/* Note that we'd really like to use O_TMPFILE here, but can't really, since we want replacement
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* semantics here, and O_TMPFILE can't offer that. i.e. rename() replaces but linkat() doesn't. */
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r = fopen_temporary(fn, &f, &p);
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if (r < 0)
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return r;
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r = write_string_stream_ts(f, line, flags, ts);
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if (r < 0)
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goto fail;
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r = fchmod_umask(fileno(f), FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 : 0644);
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if (r < 0)
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goto fail;
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if (rename(p, fn) < 0) {
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r = -errno;
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goto fail;
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}
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if (FLAGS_SET(flags, WRITE_STRING_FILE_SYNC)) {
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/* Sync the rename, too */
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r = fsync_directory_of_file(fileno(f));
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if (r < 0)
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return r;
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}
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return 0;
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fail:
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(void) unlink(p);
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return r;
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}
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int write_string_file_ts(
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const char *fn,
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const char *line,
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WriteStringFileFlags flags,
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struct timespec *ts) {
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_cleanup_fclose_ FILE *f = NULL;
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int q, r, fd;
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assert(fn);
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assert(line);
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/* We don't know how to verify whether the file contents was already on-disk. */
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assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC)));
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if (flags & WRITE_STRING_FILE_MKDIR_0755) {
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r = mkdir_parents(fn, 0755);
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if (r < 0)
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return r;
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}
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if (flags & WRITE_STRING_FILE_ATOMIC) {
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assert(flags & WRITE_STRING_FILE_CREATE);
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r = write_string_file_atomic(fn, line, flags, ts);
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if (r < 0)
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goto fail;
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return r;
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} else
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assert(!ts);
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/* We manually build our own version of fopen(..., "we") that works without O_CREAT and with O_NOFOLLOW if needed. */
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fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY |
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(FLAGS_SET(flags, WRITE_STRING_FILE_NOFOLLOW) ? O_NOFOLLOW : 0) |
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(FLAGS_SET(flags, WRITE_STRING_FILE_CREATE) ? O_CREAT : 0),
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(FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 : 0666));
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if (fd < 0) {
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r = -errno;
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goto fail;
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}
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r = fdopen_unlocked(fd, "w", &f);
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if (r < 0) {
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safe_close(fd);
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goto fail;
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}
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if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
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setvbuf(f, NULL, _IONBF, 0);
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r = write_string_stream_ts(f, line, flags, ts);
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if (r < 0)
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goto fail;
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return 0;
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fail:
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if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
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return r;
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f = safe_fclose(f);
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/* OK, the operation failed, but let's see if the right
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* contents in place already. If so, eat up the error. */
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q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
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if (q <= 0)
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return r;
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return 0;
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}
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int write_string_filef(
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const char *fn,
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WriteStringFileFlags flags,
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const char *format, ...) {
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_cleanup_free_ char *p = NULL;
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va_list ap;
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int r;
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va_start(ap, format);
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r = vasprintf(&p, format, ap);
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va_end(ap);
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if (r < 0)
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return -ENOMEM;
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return write_string_file(fn, p, flags);
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}
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int read_one_line_file(const char *fn, char **line) {
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(fn);
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assert(line);
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r = fopen_unlocked(fn, "re", &f);
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if (r < 0)
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return r;
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return read_line(f, LONG_LINE_MAX, line);
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}
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int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_free_ char *buf = NULL;
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size_t l, k;
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int r;
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assert(fn);
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assert(blob);
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l = strlen(blob);
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if (accept_extra_nl && endswith(blob, "\n"))
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accept_extra_nl = false;
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buf = malloc(l + accept_extra_nl + 1);
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if (!buf)
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return -ENOMEM;
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r = fopen_unlocked(fn, "re", &f);
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if (r < 0)
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return r;
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/* We try to read one byte more than we need, so that we know whether we hit eof */
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errno = 0;
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k = fread(buf, 1, l + accept_extra_nl + 1, f);
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if (ferror(f))
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return errno_or_else(EIO);
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if (k != l && k != l + accept_extra_nl)
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return 0;
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if (memcmp(buf, blob, l) != 0)
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return 0;
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if (k > l && buf[l] != '\n')
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return 0;
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return 1;
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}
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int read_full_virtual_file(const char *filename, char **ret_contents, size_t *ret_size) {
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_cleanup_free_ char *buf = NULL;
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_cleanup_close_ int fd = -1;
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struct stat st;
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size_t n, size;
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int n_retries;
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char *p;
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assert(ret_contents);
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/* Virtual filesystems such as sysfs or procfs use kernfs, and kernfs can work
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* with two sorts of virtual files. One sort uses "seq_file", and the results of
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* the first read are buffered for the second read. The other sort uses "raw"
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* reads which always go direct to the device. In the latter case, the content of
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* the virtual file must be retrieved with a single read otherwise a second read
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* might get the new value instead of finding EOF immediately. That's the reason
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* why the usage of fread(3) is prohibited in this case as it always performs a
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* second call to read(2) looking for EOF. See issue 13585. */
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fd = open(filename, O_RDONLY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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/* Start size for files in /proc which usually report a file size of 0. */
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size = LINE_MAX / 2;
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/* Limit the number of attempts to read the number of bytes returned by fstat(). */
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n_retries = 3;
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for (;;) {
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if (n_retries <= 0)
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return -EIO;
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if (fstat(fd, &st) < 0)
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return -errno;
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if (!S_ISREG(st.st_mode))
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return -EBADF;
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/* Be prepared for files from /proc which generally report a file size of 0. */
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if (st.st_size > 0) {
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size = st.st_size;
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n_retries--;
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} else
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size = size * 2;
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if (size > READ_FULL_BYTES_MAX)
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return -E2BIG;
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p = realloc(buf, size + 1);
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if (!p)
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return -ENOMEM;
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buf = TAKE_PTR(p);
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for (;;) {
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ssize_t k;
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|
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/* Read one more byte so we can detect whether the content of the
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* file has already changed or the guessed size for files from /proc
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* wasn't large enough . */
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k = read(fd, buf, size + 1);
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if (k >= 0) {
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n = k;
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break;
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}
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if (errno != EINTR)
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return -errno;
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}
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|
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/* Consider a short read as EOF */
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if (n <= size)
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break;
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|
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/* Hmm... either we read too few bytes from /proc or less likely the content
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* of the file might have been changed (and is now bigger) while we were
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* processing, let's try again either with a bigger guessed size or the new
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* file size. */
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|
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if (lseek(fd, 0, SEEK_SET) < 0)
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return -errno;
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}
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|
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if (n < size) {
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p = realloc(buf, n + 1);
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if (!p)
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return -ENOMEM;
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buf = TAKE_PTR(p);
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}
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|
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if (!ret_size) {
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/* Safety check: if the caller doesn't want to know the size of what we
|
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* just read it will rely on the trailing NUL byte. But if there's an
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* embedded NUL byte, then we should refuse operation as otherwise
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* there'd be ambiguity about what we just read. */
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|
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if (memchr(buf, 0, n))
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return -EBADMSG;
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} else
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*ret_size = n;
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|
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buf[n] = 0;
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*ret_contents = TAKE_PTR(buf);
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|
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return 0;
|
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}
|
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|
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int read_full_stream_full(
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FILE *f,
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const char *filename,
|
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ReadFullFileFlags flags,
|
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char **ret_contents,
|
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size_t *ret_size) {
|
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|
|
_cleanup_free_ char *buf = NULL;
|
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struct stat st;
|
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size_t n, n_next, l;
|
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int fd, r;
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|
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assert(f);
|
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assert(ret_contents);
|
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assert(!FLAGS_SET(flags, READ_FULL_FILE_UNBASE64 | READ_FULL_FILE_UNHEX));
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|
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n_next = LINE_MAX; /* Start size */
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|
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fd = fileno(f);
|
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if (fd >= 0) { /* If the FILE* object is backed by an fd (as opposed to memory or such, see fmemopen()), let's
|
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* optimize our buffering */
|
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|
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if (fstat(fd, &st) < 0)
|
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return -errno;
|
|
|
|
if (S_ISREG(st.st_mode)) {
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|
|
|
/* Safety check */
|
|
if (st.st_size > READ_FULL_BYTES_MAX)
|
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return -E2BIG;
|
|
|
|
/* Start with the right file size. Note that we increase the size
|
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* to read here by one, so that the first read attempt already
|
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* makes us notice the EOF. */
|
|
if (st.st_size > 0)
|
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n_next = st.st_size + 1;
|
|
|
|
if (flags & READ_FULL_FILE_WARN_WORLD_READABLE)
|
|
(void) warn_file_is_world_accessible(filename, &st, NULL, 0);
|
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}
|
|
}
|
|
|
|
n = l = 0;
|
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for (;;) {
|
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char *t;
|
|
size_t k;
|
|
|
|
if (flags & READ_FULL_FILE_SECURE) {
|
|
t = malloc(n_next + 1);
|
|
if (!t) {
|
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r = -ENOMEM;
|
|
goto finalize;
|
|
}
|
|
memcpy_safe(t, buf, n);
|
|
explicit_bzero_safe(buf, n);
|
|
buf = mfree(buf);
|
|
} else {
|
|
t = realloc(buf, n_next + 1);
|
|
if (!t)
|
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return -ENOMEM;
|
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}
|
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|
|
buf = t;
|
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n = n_next;
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|
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errno = 0;
|
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k = fread(buf + l, 1, n - l, f);
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|
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assert(k <= n - l);
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|
l += k;
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|
|
|
if (ferror(f)) {
|
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r = errno_or_else(EIO);
|
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goto finalize;
|
|
}
|
|
if (feof(f))
|
|
break;
|
|
|
|
assert(k > 0); /* we can't have read zero bytes because that would have been EOF */
|
|
|
|
/* Safety check */
|
|
if (n >= READ_FULL_BYTES_MAX) {
|
|
r = -E2BIG;
|
|
goto finalize;
|
|
}
|
|
|
|
n_next = MIN(n * 2, 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, &decoded, &decoded_size);
|
|
else
|
|
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) {
|
|
/* 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, l)) {
|
|
r = -EBADMSG;
|
|
goto finalize;
|
|
}
|
|
}
|
|
|
|
buf[l] = 0;
|
|
*ret_contents = TAKE_PTR(buf);
|
|
|
|
if (ret_size)
|
|
*ret_size = l;
|
|
|
|
return 0;
|
|
|
|
finalize:
|
|
if (flags & READ_FULL_FILE_SECURE)
|
|
explicit_bzero_safe(buf, n);
|
|
|
|
return r;
|
|
}
|
|
|
|
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 = 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);
|
|
}
|
|
|
|
int executable_is_script(const char *path, char **interpreter) {
|
|
_cleanup_free_ char *line = NULL;
|
|
size_t len;
|
|
char *ans;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = read_one_line_file(path, &line);
|
|
if (r == -ENOBUFS) /* First line overly long? if so, then it's not a script */
|
|
return 0;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!startswith(line, "#!"))
|
|
return 0;
|
|
|
|
ans = strstrip(line + 2);
|
|
len = strcspn(ans, " \t");
|
|
|
|
if (len == 0)
|
|
return 0;
|
|
|
|
ans = strndup(ans, len);
|
|
if (!ans)
|
|
return -ENOMEM;
|
|
|
|
*interpreter = ans;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Retrieve one field from a file like /proc/self/status. pattern
|
|
* should not include whitespace or the delimiter (':'). pattern matches only
|
|
* the beginning of a line. Whitespace before ':' is skipped. Whitespace and
|
|
* zeros after the ':' will be skipped. field must be freed afterwards.
|
|
* terminator specifies the terminating characters of the field value (not
|
|
* included in the value).
|
|
*/
|
|
int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
|
|
_cleanup_free_ char *status = NULL;
|
|
char *t, *f;
|
|
size_t len;
|
|
int r;
|
|
|
|
assert(terminator);
|
|
assert(filename);
|
|
assert(pattern);
|
|
assert(field);
|
|
|
|
r = read_full_virtual_file(filename, &status, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
t = status;
|
|
|
|
do {
|
|
bool pattern_ok;
|
|
|
|
do {
|
|
t = strstr(t, pattern);
|
|
if (!t)
|
|
return -ENOENT;
|
|
|
|
/* Check that pattern occurs in beginning of line. */
|
|
pattern_ok = (t == status || t[-1] == '\n');
|
|
|
|
t += strlen(pattern);
|
|
|
|
} while (!pattern_ok);
|
|
|
|
t += strspn(t, " \t");
|
|
if (!*t)
|
|
return -ENOENT;
|
|
|
|
} while (*t != ':');
|
|
|
|
t++;
|
|
|
|
if (*t) {
|
|
t += strspn(t, " \t");
|
|
|
|
/* Also skip zeros, because when this is used for
|
|
* capabilities, we don't want the zeros. This way the
|
|
* same capability set always maps to the same string,
|
|
* irrespective of the total capability set size. For
|
|
* other numbers it shouldn't matter. */
|
|
t += strspn(t, "0");
|
|
/* Back off one char if there's nothing but whitespace
|
|
and zeros */
|
|
if (!*t || isspace(*t))
|
|
t--;
|
|
}
|
|
|
|
len = strcspn(t, terminator);
|
|
|
|
f = strndup(t, len);
|
|
if (!f)
|
|
return -ENOMEM;
|
|
|
|
*field = f;
|
|
return 0;
|
|
}
|
|
|
|
DIR *xopendirat(int fd, const char *name, int flags) {
|
|
int nfd;
|
|
DIR *d;
|
|
|
|
assert(!(flags & O_CREAT));
|
|
|
|
nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
|
|
if (nfd < 0)
|
|
return NULL;
|
|
|
|
d = fdopendir(nfd);
|
|
if (!d) {
|
|
safe_close(nfd);
|
|
return NULL;
|
|
}
|
|
|
|
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;
|
|
|
|
assert(path);
|
|
assert(mode);
|
|
assert(_f);
|
|
|
|
if (!path_strv_resolve_uniq(search, root))
|
|
return -ENOMEM;
|
|
|
|
STRV_FOREACH(i, search) {
|
|
_cleanup_free_ char *p = NULL;
|
|
FILE *f;
|
|
|
|
p = path_join(root, *i, path);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
f = fopen(p, mode);
|
|
if (f) {
|
|
*_f = f;
|
|
return 0;
|
|
}
|
|
|
|
if (errno != ENOENT)
|
|
return -errno;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
|
|
_cleanup_strv_free_ char **copy = NULL;
|
|
|
|
assert(path);
|
|
assert(mode);
|
|
assert(_f);
|
|
|
|
if (path_is_absolute(path)) {
|
|
FILE *f;
|
|
|
|
f = fopen(path, mode);
|
|
if (f) {
|
|
*_f = f;
|
|
return 0;
|
|
}
|
|
|
|
return -errno;
|
|
}
|
|
|
|
copy = strv_copy((char**) search);
|
|
if (!copy)
|
|
return -ENOMEM;
|
|
|
|
return search_and_fopen_internal(path, mode, root, copy, _f);
|
|
}
|
|
|
|
int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
|
|
_cleanup_strv_free_ char **s = NULL;
|
|
|
|
if (path_is_absolute(path)) {
|
|
FILE *f;
|
|
|
|
f = fopen(path, mode);
|
|
if (f) {
|
|
*_f = f;
|
|
return 0;
|
|
}
|
|
|
|
return -errno;
|
|
}
|
|
|
|
s = strv_split_nulstr(search);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
return search_and_fopen_internal(path, mode, root, s, _f);
|
|
}
|
|
|
|
int chase_symlinks_and_fopen_unlocked(
|
|
const char *path,
|
|
const char *root,
|
|
unsigned chase_flags,
|
|
const char *open_flags,
|
|
FILE **ret_file,
|
|
char **ret_path) {
|
|
|
|
_cleanup_close_ int fd = -1;
|
|
_cleanup_free_ char *final_path = NULL;
|
|
int mode_flags, r;
|
|
FILE *f;
|
|
|
|
assert(path);
|
|
assert(open_flags);
|
|
assert(ret_file);
|
|
|
|
mode_flags = mode_to_flags(open_flags);
|
|
if (mode_flags < 0)
|
|
return mode_flags;
|
|
|
|
fd = chase_symlinks_and_open(path, root, chase_flags, mode_flags, ret_path ? &final_path : NULL);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
r = fdopen_unlocked(fd, open_flags, &f);
|
|
if (r < 0)
|
|
return r;
|
|
TAKE_FD(fd);
|
|
|
|
*ret_file = f;
|
|
if (ret_path)
|
|
*ret_path = TAKE_PTR(final_path);
|
|
return 0;
|
|
}
|
|
|
|
int fflush_and_check(FILE *f) {
|
|
assert(f);
|
|
|
|
errno = 0;
|
|
fflush(f);
|
|
|
|
if (ferror(f))
|
|
return errno_or_else(EIO);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fflush_sync_and_check(FILE *f) {
|
|
int r, fd;
|
|
|
|
assert(f);
|
|
|
|
r = fflush_and_check(f);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* 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(fd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int write_timestamp_file_atomic(const char *fn, usec_t n) {
|
|
char ln[DECIMAL_STR_MAX(n)+2];
|
|
|
|
/* Creates a "timestamp" file, that contains nothing but a
|
|
* usec_t timestamp, formatted in ASCII. */
|
|
|
|
if (n <= 0 || n >= USEC_INFINITY)
|
|
return -ERANGE;
|
|
|
|
xsprintf(ln, USEC_FMT "\n", n);
|
|
|
|
return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
|
|
}
|
|
|
|
int read_timestamp_file(const char *fn, usec_t *ret) {
|
|
_cleanup_free_ char *ln = NULL;
|
|
uint64_t t;
|
|
int r;
|
|
|
|
r = read_one_line_file(fn, &ln);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = safe_atou64(ln, &t);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
|
|
return -ERANGE;
|
|
|
|
*ret = (usec_t) t;
|
|
return 0;
|
|
}
|
|
|
|
int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
|
|
int r;
|
|
|
|
assert(s);
|
|
|
|
/* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
|
|
* when specified shall initially point to a boolean variable initialized to false. It is set to true after the
|
|
* first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
|
|
* element, but not before the first one. */
|
|
|
|
if (!f)
|
|
f = stdout;
|
|
|
|
if (space) {
|
|
if (!separator)
|
|
separator = " ";
|
|
|
|
if (*space) {
|
|
r = fputs(separator, f);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
*space = true;
|
|
}
|
|
|
|
return fputs(s, f);
|
|
}
|
|
|
|
/* A bitmask of the EOL markers we know */
|
|
typedef enum EndOfLineMarker {
|
|
EOL_NONE = 0,
|
|
EOL_ZERO = 1 << 0, /* \0 (aka NUL) */
|
|
EOL_TEN = 1 << 1, /* \n (aka NL, aka LF) */
|
|
EOL_THIRTEEN = 1 << 2, /* \r (aka CR) */
|
|
} EndOfLineMarker;
|
|
|
|
static EndOfLineMarker categorize_eol(char c, ReadLineFlags flags) {
|
|
|
|
if (!IN_SET(flags, READ_LINE_ONLY_NUL)) {
|
|
if (c == '\n')
|
|
return EOL_TEN;
|
|
if (c == '\r')
|
|
return EOL_THIRTEEN;
|
|
}
|
|
|
|
if (c == '\0')
|
|
return EOL_ZERO;
|
|
|
|
return EOL_NONE;
|
|
}
|
|
|
|
DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
|
|
|
|
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;
|
|
|
|
assert(f);
|
|
|
|
/* Something like a bounded version of getline().
|
|
*
|
|
* Considers EOF, \n, \r and \0 end of line delimiters (or combinations of these), and does not include these
|
|
* delimiters in the string returned. Specifically, recognizes the following combinations of markers as line
|
|
* endings:
|
|
*
|
|
* • \n (UNIX)
|
|
* • \r (old MacOS)
|
|
* • \0 (C strings)
|
|
* • \n\0
|
|
* • \r\0
|
|
* • \r\n (Windows)
|
|
* • \n\r
|
|
* • \r\n\0
|
|
* • \n\r\0
|
|
*
|
|
* Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
|
|
* the number of characters in the returned string). When EOF is hit, 0 is returned.
|
|
*
|
|
* The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
|
|
* delimiters. If the limit is hit we fail and return -ENOBUFS.
|
|
*
|
|
* If a line shall be skipped ret may be initialized as NULL. */
|
|
|
|
if (ret) {
|
|
if (!GREEDY_REALLOC(buffer, allocated, 1))
|
|
return -ENOMEM;
|
|
}
|
|
|
|
{
|
|
_unused_ _cleanup_(funlockfilep) FILE *flocked = f;
|
|
EndOfLineMarker previous_eol = EOL_NONE;
|
|
flockfile(f);
|
|
|
|
for (;;) {
|
|
EndOfLineMarker eol;
|
|
char c;
|
|
|
|
if (n >= limit)
|
|
return -ENOBUFS;
|
|
|
|
if (count >= INT_MAX) /* We couldn't return the counter anymore as "int", hence refuse this */
|
|
return -ENOBUFS;
|
|
|
|
r = safe_fgetc(f, &c);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) /* EOF is definitely EOL */
|
|
break;
|
|
|
|
eol = categorize_eol(c, flags);
|
|
|
|
if (FLAGS_SET(previous_eol, EOL_ZERO) ||
|
|
(eol == EOL_NONE && previous_eol != EOL_NONE) ||
|
|
(eol != EOL_NONE && (previous_eol & eol) != 0)) {
|
|
/* Previous char was a NUL? This is not an EOL, but the previous char was? This type of
|
|
* EOL marker has been seen right before? In either of these three cases we are
|
|
* done. But first, let's put this character back in the queue. (Note that we have to
|
|
* cast this to (unsigned char) here as ungetc() expects a positive 'int', and if we
|
|
* are on an architecture where 'char' equals 'signed char' we need to ensure we don't
|
|
* pass a negative value here. That said, to complicate things further ungetc() is
|
|
* actually happy with most negative characters and implicitly casts them back to
|
|
* positive ones as needed, except for \xff (aka -1, aka EOF), which it refuses. What a
|
|
* godawful API!) */
|
|
assert_se(ungetc((unsigned char) c, f) != EOF);
|
|
break;
|
|
}
|
|
|
|
count++;
|
|
|
|
if (eol != EOL_NONE) {
|
|
/* 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;
|
|
}
|
|
|
|
if (eol != EOL_NONE) {
|
|
previous_eol |= eol;
|
|
continue;
|
|
}
|
|
|
|
if (ret) {
|
|
if (!GREEDY_REALLOC(buffer, allocated, n + 2))
|
|
return -ENOMEM;
|
|
|
|
buffer[n] = c;
|
|
}
|
|
|
|
n++;
|
|
}
|
|
}
|
|
|
|
if (ret) {
|
|
buffer[n] = 0;
|
|
|
|
*ret = TAKE_PTR(buffer);
|
|
}
|
|
|
|
return (int) count;
|
|
}
|
|
|
|
int safe_fgetc(FILE *f, char *ret) {
|
|
int k;
|
|
|
|
assert(f);
|
|
|
|
/* A safer version of plain fgetc(): let's propagate the error that happened while reading as such, and
|
|
* separate the EOF condition from the byte read, to avoid those confusion signed/unsigned issues fgetc()
|
|
* has. */
|
|
|
|
errno = 0;
|
|
k = fgetc(f);
|
|
if (k == EOF) {
|
|
if (ferror(f))
|
|
return errno_or_else(EIO);
|
|
|
|
if (ret)
|
|
*ret = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (ret)
|
|
*ret = k;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int warn_file_is_world_accessible(const char *filename, struct stat *st, const char *unit, unsigned line) {
|
|
struct stat _st;
|
|
|
|
if (!filename)
|
|
return 0;
|
|
|
|
if (!st) {
|
|
if (stat(filename, &_st) < 0)
|
|
return -errno;
|
|
st = &_st;
|
|
}
|
|
|
|
if ((st->st_mode & S_IRWXO) == 0)
|
|
return 0;
|
|
|
|
if (unit)
|
|
log_syntax(unit, LOG_WARNING, filename, line, 0,
|
|
"%s has %04o mode that is too permissive, please adjust the ownership and access mode.",
|
|
filename, st->st_mode & 07777);
|
|
else
|
|
log_warning("%s has %04o mode that is too permissive, please adjust the ownership and access mode.",
|
|
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;
|
|
}
|