1351 lines
37 KiB
C
1351 lines
37 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 <string.h>
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#include <sys/mman.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 "env-util.h"
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#include "escape.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 "log.h"
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#include "macro.h"
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#include "missing.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "tmpfile-util.h"
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#include "utf8.h"
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#define READ_FULL_BYTES_MAX (4U*1024U*1024U)
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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;
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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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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(fileno(f), 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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r = fopen_temporary(fn, &f, &p);
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if (r < 0)
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return r;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod_umask(fileno(f), 0644);
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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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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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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;
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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_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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if (flags & WRITE_STRING_FILE_CREATE) {
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f = fopen(fn, "we");
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if (!f) {
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r = -errno;
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goto fail;
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}
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} else {
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int fd;
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/* We manually build our own version of fopen(..., "we") that
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* works without O_CREAT */
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fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY | ((flags & WRITE_STRING_FILE_NOFOLLOW) ? O_NOFOLLOW : 0));
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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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f = fdopen(fd, "we");
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if (!f) {
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r = -errno;
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safe_close(fd);
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goto fail;
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}
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}
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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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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f = fopen(fn, "re");
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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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r = read_line(f, LONG_LINE_MAX, line);
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return r < 0 ? r : 0;
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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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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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f = fopen(fn, "re");
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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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/* 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 > 0 ? -errno : -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_stream(FILE *f, char **contents, size_t *size) {
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_cleanup_free_ char *buf = NULL;
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struct stat st;
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size_t n, l;
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int fd;
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assert(f);
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assert(contents);
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n = LINE_MAX;
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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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if (fstat(fileno(f), &st) < 0)
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return -errno;
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if (S_ISREG(st.st_mode)) {
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/* Safety check */
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if (st.st_size > READ_FULL_BYTES_MAX)
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return -E2BIG;
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/* Start with the right file size, but be prepared for files from /proc which generally report a file
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* size of 0. Note that we increase the size to read here by one, so that the first read attempt
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* already makes us notice the EOF. */
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if (st.st_size > 0)
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n = st.st_size + 1;
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}
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}
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l = 0;
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for (;;) {
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char *t;
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size_t k;
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t = realloc(buf, n + 1);
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if (!t)
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return -ENOMEM;
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buf = t;
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errno = 0;
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k = fread(buf + l, 1, n - l, f);
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if (k > 0)
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l += k;
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if (ferror(f))
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return errno > 0 ? -errno : -EIO;
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if (feof(f))
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break;
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/* We aren't expecting fread() to return a short read outside
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* of (error && eof), assert buffer is full and enlarge buffer.
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*/
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assert(l == n);
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/* Safety check */
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if (n >= READ_FULL_BYTES_MAX)
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return -E2BIG;
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n = MIN(n * 2, READ_FULL_BYTES_MAX);
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}
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buf[l] = 0;
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*contents = TAKE_PTR(buf);
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if (size)
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*size = l;
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return 0;
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}
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int read_full_file(const char *fn, char **contents, size_t *size) {
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_cleanup_fclose_ FILE *f = NULL;
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assert(fn);
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assert(contents);
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f = fopen(fn, "re");
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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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return read_full_stream(f, contents, size);
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}
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static int parse_env_file_internal(
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FILE *f,
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const char *fname,
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int (*push) (const char *filename, unsigned line,
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const char *key, char *value, void *userdata, int *n_pushed),
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void *userdata,
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int *n_pushed) {
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size_t key_alloc = 0, n_key = 0, value_alloc = 0, n_value = 0, last_value_whitespace = (size_t) -1, last_key_whitespace = (size_t) -1;
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_cleanup_free_ char *contents = NULL, *key = NULL, *value = NULL;
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unsigned line = 1;
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char *p;
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int r;
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enum {
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PRE_KEY,
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KEY,
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PRE_VALUE,
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VALUE,
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VALUE_ESCAPE,
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SINGLE_QUOTE_VALUE,
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SINGLE_QUOTE_VALUE_ESCAPE,
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DOUBLE_QUOTE_VALUE,
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DOUBLE_QUOTE_VALUE_ESCAPE,
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COMMENT,
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COMMENT_ESCAPE
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} state = PRE_KEY;
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if (f)
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r = read_full_stream(f, &contents, NULL);
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else
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r = read_full_file(fname, &contents, NULL);
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if (r < 0)
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return r;
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for (p = contents; *p; p++) {
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char c = *p;
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switch (state) {
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case PRE_KEY:
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if (strchr(COMMENTS, c))
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state = COMMENT;
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else if (!strchr(WHITESPACE, c)) {
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state = KEY;
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last_key_whitespace = (size_t) -1;
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if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
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return -ENOMEM;
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key[n_key++] = c;
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}
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break;
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case KEY:
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if (strchr(NEWLINE, c)) {
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state = PRE_KEY;
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line++;
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n_key = 0;
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} else if (c == '=') {
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state = PRE_VALUE;
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last_value_whitespace = (size_t) -1;
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} else {
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if (!strchr(WHITESPACE, c))
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last_key_whitespace = (size_t) -1;
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else if (last_key_whitespace == (size_t) -1)
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last_key_whitespace = n_key;
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if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
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return -ENOMEM;
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key[n_key++] = c;
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}
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break;
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case PRE_VALUE:
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if (strchr(NEWLINE, c)) {
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state = PRE_KEY;
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line++;
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key[n_key] = 0;
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if (value)
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value[n_value] = 0;
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/* strip trailing whitespace from key */
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if (last_key_whitespace != (size_t) -1)
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key[last_key_whitespace] = 0;
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r = push(fname, line, key, value, userdata, n_pushed);
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if (r < 0)
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return r;
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n_key = 0;
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value = NULL;
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value_alloc = n_value = 0;
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} else if (c == '\'')
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state = SINGLE_QUOTE_VALUE;
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else if (c == '\"')
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state = DOUBLE_QUOTE_VALUE;
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else if (c == '\\')
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state = VALUE_ESCAPE;
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else if (!strchr(WHITESPACE, c)) {
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state = VALUE;
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
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return -ENOMEM;
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value[n_value++] = c;
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}
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break;
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case VALUE:
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if (strchr(NEWLINE, c)) {
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state = PRE_KEY;
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line++;
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key[n_key] = 0;
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|
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if (value)
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value[n_value] = 0;
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|
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/* Chomp off trailing whitespace from value */
|
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if (last_value_whitespace != (size_t) -1)
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value[last_value_whitespace] = 0;
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|
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/* strip trailing whitespace from key */
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if (last_key_whitespace != (size_t) -1)
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key[last_key_whitespace] = 0;
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|
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r = push(fname, line, key, value, userdata, n_pushed);
|
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if (r < 0)
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return r;
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|
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n_key = 0;
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value = NULL;
|
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value_alloc = n_value = 0;
|
|
|
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} else if (c == '\\') {
|
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state = VALUE_ESCAPE;
|
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last_value_whitespace = (size_t) -1;
|
|
} else {
|
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if (!strchr(WHITESPACE, c))
|
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last_value_whitespace = (size_t) -1;
|
|
else if (last_value_whitespace == (size_t) -1)
|
|
last_value_whitespace = n_value;
|
|
|
|
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
|
return -ENOMEM;
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|
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value[n_value++] = c;
|
|
}
|
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|
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break;
|
|
|
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case VALUE_ESCAPE:
|
|
state = VALUE;
|
|
|
|
if (!strchr(NEWLINE, c)) {
|
|
/* Escaped newlines we eat up entirely */
|
|
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
|
return -ENOMEM;
|
|
|
|
value[n_value++] = c;
|
|
}
|
|
break;
|
|
|
|
case SINGLE_QUOTE_VALUE:
|
|
if (c == '\'')
|
|
state = PRE_VALUE;
|
|
else if (c == '\\')
|
|
state = SINGLE_QUOTE_VALUE_ESCAPE;
|
|
else {
|
|
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
|
return -ENOMEM;
|
|
|
|
value[n_value++] = c;
|
|
}
|
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|
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break;
|
|
|
|
case SINGLE_QUOTE_VALUE_ESCAPE:
|
|
state = SINGLE_QUOTE_VALUE;
|
|
|
|
if (!strchr(NEWLINE, c)) {
|
|
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
|
return -ENOMEM;
|
|
|
|
value[n_value++] = c;
|
|
}
|
|
break;
|
|
|
|
case DOUBLE_QUOTE_VALUE:
|
|
if (c == '\"')
|
|
state = PRE_VALUE;
|
|
else if (c == '\\')
|
|
state = DOUBLE_QUOTE_VALUE_ESCAPE;
|
|
else {
|
|
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
|
return -ENOMEM;
|
|
|
|
value[n_value++] = c;
|
|
}
|
|
|
|
break;
|
|
|
|
case DOUBLE_QUOTE_VALUE_ESCAPE:
|
|
state = DOUBLE_QUOTE_VALUE;
|
|
|
|
if (!strchr(NEWLINE, c)) {
|
|
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
|
return -ENOMEM;
|
|
|
|
value[n_value++] = c;
|
|
}
|
|
break;
|
|
|
|
case COMMENT:
|
|
if (c == '\\')
|
|
state = COMMENT_ESCAPE;
|
|
else if (strchr(NEWLINE, c)) {
|
|
state = PRE_KEY;
|
|
line++;
|
|
}
|
|
break;
|
|
|
|
case COMMENT_ESCAPE:
|
|
state = COMMENT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (IN_SET(state,
|
|
PRE_VALUE,
|
|
VALUE,
|
|
VALUE_ESCAPE,
|
|
SINGLE_QUOTE_VALUE,
|
|
SINGLE_QUOTE_VALUE_ESCAPE,
|
|
DOUBLE_QUOTE_VALUE,
|
|
DOUBLE_QUOTE_VALUE_ESCAPE)) {
|
|
|
|
key[n_key] = 0;
|
|
|
|
if (value)
|
|
value[n_value] = 0;
|
|
|
|
if (state == VALUE)
|
|
if (last_value_whitespace != (size_t) -1)
|
|
value[last_value_whitespace] = 0;
|
|
|
|
/* strip trailing whitespace from key */
|
|
if (last_key_whitespace != (size_t) -1)
|
|
key[last_key_whitespace] = 0;
|
|
|
|
r = push(fname, line, key, value, userdata, n_pushed);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
value = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int check_utf8ness_and_warn(
|
|
const char *filename, unsigned line,
|
|
const char *key, char *value) {
|
|
|
|
if (!utf8_is_valid(key)) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = utf8_escape_invalid(key);
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"%s:%u: invalid UTF-8 in key '%s', ignoring.",
|
|
strna(filename), line, p);
|
|
}
|
|
|
|
if (value && !utf8_is_valid(value)) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = utf8_escape_invalid(value);
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.",
|
|
strna(filename), line, key, p);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_env_file_push(
|
|
const char *filename, unsigned line,
|
|
const char *key, char *value,
|
|
void *userdata,
|
|
int *n_pushed) {
|
|
|
|
const char *k;
|
|
va_list aq, *ap = userdata;
|
|
int r;
|
|
|
|
r = check_utf8ness_and_warn(filename, line, key, value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
va_copy(aq, *ap);
|
|
|
|
while ((k = va_arg(aq, const char *))) {
|
|
char **v;
|
|
|
|
v = va_arg(aq, char **);
|
|
|
|
if (streq(key, k)) {
|
|
va_end(aq);
|
|
free(*v);
|
|
*v = value;
|
|
|
|
if (n_pushed)
|
|
(*n_pushed)++;
|
|
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
va_end(aq);
|
|
free(value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int parse_env_filev(
|
|
FILE *f,
|
|
const char *fname,
|
|
va_list ap) {
|
|
|
|
int r, n_pushed = 0;
|
|
va_list aq;
|
|
|
|
va_copy(aq, ap);
|
|
r = parse_env_file_internal(f, fname, parse_env_file_push, &aq, &n_pushed);
|
|
va_end(aq);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return n_pushed;
|
|
}
|
|
|
|
int parse_env_file_sentinel(
|
|
FILE *f,
|
|
const char *fname,
|
|
...) {
|
|
|
|
va_list ap;
|
|
int r;
|
|
|
|
va_start(ap, fname);
|
|
r = parse_env_filev(f, fname, ap);
|
|
va_end(ap);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int load_env_file_push(
|
|
const char *filename, unsigned line,
|
|
const char *key, char *value,
|
|
void *userdata,
|
|
int *n_pushed) {
|
|
char ***m = userdata;
|
|
char *p;
|
|
int r;
|
|
|
|
r = check_utf8ness_and_warn(filename, line, key, value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
p = strjoin(key, "=", value);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = strv_env_replace(m, p);
|
|
if (r < 0) {
|
|
free(p);
|
|
return r;
|
|
}
|
|
|
|
if (n_pushed)
|
|
(*n_pushed)++;
|
|
|
|
free(value);
|
|
return 0;
|
|
}
|
|
|
|
int load_env_file(FILE *f, const char *fname, char ***rl) {
|
|
char **m = NULL;
|
|
int r;
|
|
|
|
r = parse_env_file_internal(f, fname, load_env_file_push, &m, NULL);
|
|
if (r < 0) {
|
|
strv_free(m);
|
|
return r;
|
|
}
|
|
|
|
*rl = m;
|
|
return 0;
|
|
}
|
|
|
|
static int load_env_file_push_pairs(
|
|
const char *filename, unsigned line,
|
|
const char *key, char *value,
|
|
void *userdata,
|
|
int *n_pushed) {
|
|
char ***m = userdata;
|
|
int r;
|
|
|
|
r = check_utf8ness_and_warn(filename, line, key, value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = strv_extend(m, key);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
|
|
if (!value) {
|
|
r = strv_extend(m, "");
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
} else {
|
|
r = strv_push(m, value);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (n_pushed)
|
|
(*n_pushed)++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int load_env_file_pairs(FILE *f, const char *fname, char ***rl) {
|
|
char **m = NULL;
|
|
int r;
|
|
|
|
r = parse_env_file_internal(f, fname, load_env_file_push_pairs, &m, NULL);
|
|
if (r < 0) {
|
|
strv_free(m);
|
|
return r;
|
|
}
|
|
|
|
*rl = m;
|
|
return 0;
|
|
}
|
|
|
|
static int merge_env_file_push(
|
|
const char *filename, unsigned line,
|
|
const char *key, char *value,
|
|
void *userdata,
|
|
int *n_pushed) {
|
|
|
|
char ***env = userdata;
|
|
char *expanded_value;
|
|
|
|
assert(env);
|
|
|
|
if (!value) {
|
|
log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key);
|
|
return 0;
|
|
}
|
|
|
|
if (!env_name_is_valid(key)) {
|
|
log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key);
|
|
free(value);
|
|
return 0;
|
|
}
|
|
|
|
expanded_value = replace_env(value, *env,
|
|
REPLACE_ENV_USE_ENVIRONMENT|
|
|
REPLACE_ENV_ALLOW_BRACELESS|
|
|
REPLACE_ENV_ALLOW_EXTENDED);
|
|
if (!expanded_value)
|
|
return -ENOMEM;
|
|
|
|
free_and_replace(value, expanded_value);
|
|
|
|
return load_env_file_push(filename, line, key, value, env, n_pushed);
|
|
}
|
|
|
|
int merge_env_file(
|
|
char ***env,
|
|
FILE *f,
|
|
const char *fname) {
|
|
|
|
/* NOTE: this function supports braceful and braceless variable expansions,
|
|
* plus "extended" substitutions, unlike other exported parsing functions.
|
|
*/
|
|
|
|
return parse_env_file_internal(f, fname, merge_env_file_push, env, NULL);
|
|
}
|
|
|
|
static void write_env_var(FILE *f, const char *v) {
|
|
const char *p;
|
|
|
|
p = strchr(v, '=');
|
|
if (!p) {
|
|
/* Fallback */
|
|
fputs_unlocked(v, f);
|
|
fputc_unlocked('\n', f);
|
|
return;
|
|
}
|
|
|
|
p++;
|
|
fwrite_unlocked(v, 1, p-v, f);
|
|
|
|
if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
|
|
fputc_unlocked('\"', f);
|
|
|
|
for (; *p; p++) {
|
|
if (strchr(SHELL_NEED_ESCAPE, *p))
|
|
fputc_unlocked('\\', f);
|
|
|
|
fputc_unlocked(*p, f);
|
|
}
|
|
|
|
fputc_unlocked('\"', f);
|
|
} else
|
|
fputs_unlocked(p, f);
|
|
|
|
fputc_unlocked('\n', f);
|
|
}
|
|
|
|
int write_env_file(const char *fname, char **l) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
_cleanup_free_ char *p = NULL;
|
|
char **i;
|
|
int r;
|
|
|
|
assert(fname);
|
|
|
|
r = fopen_temporary(fname, &f, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
|
(void) fchmod_umask(fileno(f), 0644);
|
|
|
|
STRV_FOREACH(i, l)
|
|
write_env_var(f, *i);
|
|
|
|
r = fflush_and_check(f);
|
|
if (r >= 0) {
|
|
if (rename(p, fname) >= 0)
|
|
return 0;
|
|
|
|
r = -errno;
|
|
}
|
|
|
|
unlink(p);
|
|
return r;
|
|
}
|
|
|
|
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_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 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;
|
|
|
|
if (root)
|
|
p = strjoin(root, *i, "/", path);
|
|
else
|
|
p = strjoin(*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 fflush_and_check(FILE *f) {
|
|
assert(f);
|
|
|
|
errno = 0;
|
|
fflush(f);
|
|
|
|
if (ferror(f))
|
|
return errno > 0 ? -errno : -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fflush_sync_and_check(FILE *f) {
|
|
int r;
|
|
|
|
assert(f);
|
|
|
|
r = fflush_and_check(f);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (fsync(fileno(f)) < 0)
|
|
return -errno;
|
|
|
|
r = fsync_directory_of_file(fileno(f));
|
|
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);
|
|
}
|
|
|
|
int open_serialization_fd(const char *ident) {
|
|
int fd;
|
|
|
|
fd = memfd_create(ident, MFD_CLOEXEC);
|
|
if (fd < 0) {
|
|
const char *path;
|
|
|
|
path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
|
|
fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
log_debug("Serializing %s to %s.", ident, path);
|
|
} else
|
|
log_debug("Serializing %s to memfd.", ident);
|
|
|
|
return fd;
|
|
}
|
|
|
|
int read_nul_string(FILE *f, char **ret) {
|
|
_cleanup_free_ char *x = NULL;
|
|
size_t allocated = 0, n = 0;
|
|
|
|
assert(f);
|
|
assert(ret);
|
|
|
|
/* Reads a NUL-terminated string from the specified file. */
|
|
|
|
for (;;) {
|
|
int c;
|
|
|
|
if (!GREEDY_REALLOC(x, allocated, n+2))
|
|
return -ENOMEM;
|
|
|
|
c = fgetc(f);
|
|
if (c == 0) /* Terminate at NUL byte */
|
|
break;
|
|
if (c == EOF) {
|
|
if (ferror(f))
|
|
return -errno;
|
|
break; /* Terminate at EOF */
|
|
}
|
|
|
|
x[n++] = (char) c;
|
|
}
|
|
|
|
if (x)
|
|
x[n] = 0;
|
|
else {
|
|
x = new0(char, 1);
|
|
if (!x)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*ret = TAKE_PTR(x);
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
|
|
|
|
int read_line(FILE *f, size_t limit, char **ret) {
|
|
_cleanup_free_ char *buffer = NULL;
|
|
size_t n = 0, allocated = 0, count = 0;
|
|
|
|
assert(f);
|
|
|
|
/* Something like a bounded version of getline().
|
|
*
|
|
* Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
|
|
* returned.
|
|
*
|
|
* 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;
|
|
flockfile(f);
|
|
|
|
for (;;) {
|
|
int c;
|
|
|
|
if (n >= limit)
|
|
return -ENOBUFS;
|
|
|
|
errno = 0;
|
|
c = fgetc_unlocked(f);
|
|
if (c == EOF) {
|
|
/* if we read an error, and have no data to return, then propagate the error */
|
|
if (ferror_unlocked(f) && n == 0)
|
|
return errno > 0 ? -errno : -EIO;
|
|
|
|
break;
|
|
}
|
|
|
|
count++;
|
|
|
|
if (IN_SET(c, '\n', 0)) /* Reached a delimiter */
|
|
break;
|
|
|
|
if (ret) {
|
|
if (!GREEDY_REALLOC(buffer, allocated, n + 2))
|
|
return -ENOMEM;
|
|
|
|
buffer[n] = (char) c;
|
|
}
|
|
|
|
n++;
|
|
}
|
|
}
|
|
|
|
if (ret) {
|
|
buffer[n] = 0;
|
|
|
|
*ret = TAKE_PTR(buffer);
|
|
}
|
|
|
|
return (int) count;
|
|
}
|