mirror of
https://github.com/systemd/systemd.git
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772 lines
22 KiB
C
772 lines
22 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 <sys/sendfile.h>
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#include "fileio.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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int write_string_to_file(FILE *f, const char *line) {
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errno = 0;
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fputs(line, f);
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if (!endswith(line, "\n"))
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fputc('\n', f);
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fflush(f);
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if (ferror(f))
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return errno ? -errno : -EIO;
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return 0;
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}
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int write_string_file(const char *fn, const char *line) {
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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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f = fopen(fn, "we");
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if (!f)
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return -errno;
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return write_string_to_file(f, line);
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}
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int write_string_file_atomic(const char *fn, const char *line) {
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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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errno = 0;
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fputs(line, f);
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if (!endswith(line, "\n"))
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fputc('\n', f);
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fflush(f);
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if (ferror(f))
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r = errno ? -errno : -EIO;
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else {
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if (rename(p, fn) < 0)
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r = -errno;
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else
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r = 0;
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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 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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ssize_t sendfile_full(int out_fd, const char *fn) {
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_cleanup_fclose_ FILE *f;
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struct stat st;
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int r;
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ssize_t s;
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size_t n, l;
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_cleanup_free_ char *buf = NULL;
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assert(out_fd > 0);
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assert(fn);
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f = fopen(fn, "r");
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if (!f)
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return -errno;
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r = fstat(fileno(f), &st);
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if (r < 0)
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return -errno;
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s = sendfile(out_fd, fileno(f), NULL, st.st_size);
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if (s < 0)
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if (errno == EINVAL || errno == ENOSYS) {
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/* continue below */
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} else
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return -errno;
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else
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return s;
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/* sendfile() failed, fall back to read/write */
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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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n = st.st_size > 0 ? st.st_size : LINE_MAX;
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l = 0;
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while (true) {
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char *t;
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size_t k;
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t = realloc(buf, n);
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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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r = write(out_fd, buf, l);
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if (r < 0)
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return -errno;
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return (ssize_t) l;
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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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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(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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if (fstat(fileno(f), &st) < 0)
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return -errno;
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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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n = st.st_size > 0 ? st.st_size : LINE_MAX;
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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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static int parse_env_file_internal(
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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),
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void *userdata) {
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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(fname);
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assert(newline);
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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((void**) &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((void**) &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);
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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((void**) &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);
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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((void**) &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((void**) &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((void**) &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((void**) &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((void**) &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((void**) &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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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;
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if (value)
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value[n_value] = 0;
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if (state == 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);
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if (r < 0)
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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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free(value);
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return r;
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}
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static int parse_env_file_push(const char *filename, unsigned line,
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const char *key, char *value, void *userdata) {
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assert(utf8_is_valid(key));
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if (value && !utf8_is_valid(value))
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/* FIXME: filter UTF-8 */
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log_error("%s:%u: invalid UTF-8 for key %s: '%s', ignoring.",
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filename, line, key, value);
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else {
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const char *k;
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va_list* ap = (va_list*) userdata;
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va_list aq;
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va_copy(aq, *ap);
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while ((k = va_arg(aq, const char *))) {
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char **v;
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v = va_arg(aq, char **);
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if (streq(key, k)) {
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va_end(aq);
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free(*v);
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*v = value;
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return 1;
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}
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}
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va_end(aq);
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}
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free(value);
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return 0;
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}
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int parse_env_file(
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const char *fname,
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const char *newline, ...) {
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|
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va_list ap;
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int r;
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if (!newline)
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newline = NEWLINE;
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va_start(ap, newline);
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r = parse_env_file_internal(fname, newline, parse_env_file_push, &ap);
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va_end(ap);
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return r;
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}
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static int load_env_file_push(const char *filename, unsigned line,
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const char *key, char *value, void *userdata) {
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assert(utf8_is_valid(key));
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|
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if (value && !utf8_is_valid(value))
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/* FIXME: filter UTF-8 */
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log_error("%s:%u: invalid UTF-8 for key %s: '%s', ignoring.",
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|
filename, line, key, value);
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else {
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char ***m = userdata;
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char *p;
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int r;
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|
|
p = strjoin(key, "=", strempty(value), NULL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = strv_push(m, p);
|
|
if (r < 0) {
|
|
free(p);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
free(value);
|
|
return 0;
|
|
}
|
|
|
|
int load_env_file(const char *fname, const char *newline, char ***rl) {
|
|
char **m = NULL;
|
|
int r;
|
|
|
|
if (!newline)
|
|
newline = NEWLINE;
|
|
|
|
r = parse_env_file_internal(fname, newline, load_env_file_push, &m);
|
|
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) || chars_intersect(p, WHITESPACE "\'\"\\`$")) {
|
|
fputc('\"', f);
|
|
|
|
for (; *p; p++) {
|
|
if (strchr("\'\"\\`$", *p))
|
|
fputc('\\', f);
|
|
|
|
fputc(*p, f);
|
|
}
|
|
|
|
fputc('\"', f);
|
|
} else
|
|
fputs(p, f);
|
|
|
|
fputc('\n', f);
|
|
}
|
|
|
|
int write_env_file(const char *fname, char **l) {
|
|
char **i;
|
|
_cleanup_free_ char *p = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int r;
|
|
|
|
r = fopen_temporary(fname, &f, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
fchmod_umask(fileno(f), 0644);
|
|
|
|
errno = 0;
|
|
STRV_FOREACH(i, l)
|
|
write_env_var(f, *i);
|
|
|
|
fflush(f);
|
|
|
|
if (ferror(f))
|
|
r = errno ? -errno : -EIO;
|
|
else {
|
|
if (rename(p, fname) < 0)
|
|
r = -errno;
|
|
else
|
|
r = 0;
|
|
}
|
|
|
|
if (r < 0)
|
|
unlink(p);
|
|
|
|
return r;
|
|
}
|
|
|
|
int executable_is_script(const char *path, char **interpreter) {
|
|
int r;
|
|
char _cleanup_free_ *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 start with '\n' and end with a ':'. Whitespace and zeros
|
|
* after the ':' will be skipped. field must be freed afterwards.
|
|
*/
|
|
int get_status_field(const char *filename, const char *pattern, char **field) {
|
|
_cleanup_free_ char *status = NULL;
|
|
char *t;
|
|
size_t len;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(pattern);
|
|
assert(field);
|
|
|
|
r = read_full_file(filename, &status, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
t = strstr(status, pattern);
|
|
if (!t)
|
|
return -ENOENT;
|
|
|
|
t += strlen(pattern);
|
|
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, WHITESPACE);
|
|
|
|
*field = strndup(t, len);
|
|
if (!*field)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|