mirror of
https://github.com/morgan9e/systemd
synced 2026-04-15 17:06:39 +09:00
c4cd1d4d93
All users of get_status_field() expect the field pattern to occur in the beginning of a line, and the delimiter is ':'. Hardcode this into the function, and also skip any whitespace before ':' to support fields in files like /proc/cpuinfo. Add support for returning the full field value (currently stops on first whitespace). Rename the function so it's easier to ensure all callers switch to new semantics.
848 lines
24 KiB
C
848 lines
24 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include "util.h"
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#include "strv.h"
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#include "utf8.h"
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#include "ctype.h"
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#include "fileio.h"
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int write_string_stream(FILE *f, const char *line, bool enforce_newline) {
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assert(f);
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assert(line);
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fputs(line, f);
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if (enforce_newline && !endswith(line, "\n"))
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fputc('\n', f);
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return fflush_and_check(f);
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}
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static int write_string_file_atomic(const char *fn, const char *line, bool enforce_newline) {
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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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fchmod_umask(fileno(f), 0644);
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r = write_string_stream(f, line, enforce_newline);
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if (r >= 0) {
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if (rename(p, fn) < 0)
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r = -errno;
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}
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if (r < 0)
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unlink(p);
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return r;
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}
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int write_string_file(const char *fn, const char *line, WriteStringFileFlags flags) {
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_cleanup_fclose_ FILE *f = NULL;
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assert(fn);
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assert(line);
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if (flags & WRITE_STRING_FILE_ATOMIC) {
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assert(flags & WRITE_STRING_FILE_CREATE);
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return write_string_file_atomic(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
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}
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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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return -errno;
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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);
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if (fd < 0)
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return -errno;
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f = fdopen(fd, "we");
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if (!f) {
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safe_close(fd);
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return -errno;
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}
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}
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return write_string_stream(f, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
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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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char t[LINE_MAX], *c;
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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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if (!fgets(t, sizeof(t), f)) {
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if (ferror(f))
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return errno ? -errno : -EIO;
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t[0] = 0;
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}
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c = strdup(t);
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if (!c)
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return -ENOMEM;
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truncate_nl(c);
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*line = c;
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return 0;
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}
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int verify_one_line_file(const char *fn, const char *line) {
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_cleanup_free_ char *value = NULL;
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int r;
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r = read_one_line_file(fn, &value);
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if (r < 0)
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return r;
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return streq(value, line);
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}
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int read_full_stream(FILE *f, char **contents, size_t *size) {
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size_t n, l;
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_cleanup_free_ char *buf = NULL;
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struct stat st;
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assert(f);
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assert(contents);
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if (fstat(fileno(f), &st) < 0)
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return -errno;
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n = LINE_MAX;
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if (S_ISREG(st.st_mode)) {
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/* Safety check */
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if (st.st_size > 4*1024*1024)
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return -E2BIG;
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/* Start with the right file size, but be prepared for
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* files from /proc which generally report a file size
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* of 0 */
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if (st.st_size > 0)
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n = st.st_size;
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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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k = fread(buf + l, 1, n - l, f);
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if (k <= 0) {
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if (ferror(f))
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return -errno;
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break;
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}
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l += k;
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n *= 2;
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/* Safety check */
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if (n > 4*1024*1024)
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return -E2BIG;
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}
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buf[l] = 0;
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*contents = buf;
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buf = NULL; /* do not free */
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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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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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const char *newline,
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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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_cleanup_free_ char *contents = NULL, *key = NULL;
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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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char *p, *value = NULL;
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int r;
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unsigned line = 1;
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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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assert(newline);
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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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r = -ENOMEM;
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goto fail;
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}
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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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r = -ENOMEM;
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goto fail;
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}
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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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goto fail;
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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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r = -ENOMEM;
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goto fail;
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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:
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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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/* 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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/* 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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goto fail;
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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;
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} else {
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if (!strchr(WHITESPACE, c))
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last_value_whitespace = (size_t) -1;
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else if (last_value_whitespace == (size_t) -1)
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last_value_whitespace = n_value;
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
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r = -ENOMEM;
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goto fail;
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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:
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state = VALUE;
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if (!strchr(newline, c)) {
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/* Escaped newlines we eat up entirely */
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
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r = -ENOMEM;
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goto fail;
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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 SINGLE_QUOTE_VALUE:
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if (c == '\'')
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state = PRE_VALUE;
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else if (c == '\\')
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state = SINGLE_QUOTE_VALUE_ESCAPE;
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else {
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
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r = -ENOMEM;
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goto fail;
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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 SINGLE_QUOTE_VALUE_ESCAPE:
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state = SINGLE_QUOTE_VALUE;
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if (!strchr(newline, c)) {
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
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r = -ENOMEM;
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goto fail;
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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 DOUBLE_QUOTE_VALUE:
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if (c == '\"')
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state = PRE_VALUE;
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else if (c == '\\')
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state = DOUBLE_QUOTE_VALUE_ESCAPE;
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else {
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
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r = -ENOMEM;
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goto fail;
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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 DOUBLE_QUOTE_VALUE_ESCAPE:
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state = DOUBLE_QUOTE_VALUE;
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if (!strchr(newline, c)) {
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if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
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r = -ENOMEM;
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goto fail;
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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 COMMENT:
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if (c == '\\')
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state = COMMENT_ESCAPE;
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else if (strchr(newline, c)) {
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state = PRE_KEY;
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line ++;
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}
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break;
|
|
|
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case COMMENT_ESCAPE:
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state = COMMENT;
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break;
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}
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}
|
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|
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if (state == PRE_VALUE ||
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state == VALUE ||
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state == VALUE_ESCAPE ||
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state == SINGLE_QUOTE_VALUE ||
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state == SINGLE_QUOTE_VALUE_ESCAPE ||
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state == DOUBLE_QUOTE_VALUE ||
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state == DOUBLE_QUOTE_VALUE_ESCAPE) {
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|
|
|
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)
|
|
goto fail;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
free(value);
|
|
return r;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!utf8_is_valid(key)) {
|
|
_cleanup_free_ char *p;
|
|
|
|
p = utf8_escape_invalid(key);
|
|
log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (value && !utf8_is_valid(value)) {
|
|
_cleanup_free_ char *p;
|
|
|
|
p = utf8_escape_invalid(value);
|
|
log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_file(
|
|
const char *fname,
|
|
const char *newline, ...) {
|
|
|
|
va_list ap;
|
|
int r, n_pushed = 0;
|
|
|
|
if (!newline)
|
|
newline = NEWLINE;
|
|
|
|
va_start(ap, newline);
|
|
r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed);
|
|
va_end(ap);
|
|
|
|
return r < 0 ? r : n_pushed;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!utf8_is_valid(key)) {
|
|
_cleanup_free_ char *t = utf8_escape_invalid(key);
|
|
|
|
log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (value && !utf8_is_valid(value)) {
|
|
_cleanup_free_ char *t = utf8_escape_invalid(value);
|
|
|
|
log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t);
|
|
return -EINVAL;
|
|
}
|
|
|
|
p = strjoin(key, "=", strempty(value), NULL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = strv_consume(m, p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (n_pushed)
|
|
(*n_pushed)++;
|
|
|
|
free(value);
|
|
return 0;
|
|
}
|
|
|
|
int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
|
|
char **m = NULL;
|
|
int r;
|
|
|
|
if (!newline)
|
|
newline = NEWLINE;
|
|
|
|
r = parse_env_file_internal(f, fname, newline, 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;
|
|
|
|
if (!utf8_is_valid(key)) {
|
|
_cleanup_free_ char *t = utf8_escape_invalid(key);
|
|
|
|
log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (value && !utf8_is_valid(value)) {
|
|
_cleanup_free_ char *t = utf8_escape_invalid(value);
|
|
|
|
log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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, const char *newline, char ***rl) {
|
|
char **m = NULL;
|
|
int r;
|
|
|
|
if (!newline)
|
|
newline = NEWLINE;
|
|
|
|
r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
|
|
if (r < 0) {
|
|
strv_free(m);
|
|
return r;
|
|
}
|
|
|
|
*rl = m;
|
|
return 0;
|
|
}
|
|
|
|
static void write_env_var(FILE *f, const char *v) {
|
|
const char *p;
|
|
|
|
p = strchr(v, '=');
|
|
if (!p) {
|
|
/* Fallback */
|
|
fputs(v, f);
|
|
fputc('\n', f);
|
|
return;
|
|
}
|
|
|
|
p++;
|
|
fwrite(v, 1, p-v, f);
|
|
|
|
if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
|
|
fputc('\"', f);
|
|
|
|
for (; *p; p++) {
|
|
if (strchr(SHELL_NEED_ESCAPE, *p))
|
|
fputc('\\', f);
|
|
|
|
fputc(*p, f);
|
|
}
|
|
|
|
fputc('\"', f);
|
|
} else
|
|
fputs(p, f);
|
|
|
|
fputc('\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;
|
|
|
|
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) {
|
|
int r;
|
|
_cleanup_free_ char *line = NULL;
|
|
int len;
|
|
char *ans;
|
|
|
|
assert(path);
|
|
|
|
r = read_one_line_file(path, &line);
|
|
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;
|
|
}
|