428 lines
8.5 KiB
C
428 lines
8.5 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <ell/ell.h>
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#include "src/common.h"
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#include "src/storage.h"
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#define STORAGE_DIR_MODE (S_IRUSR | S_IWUSR | S_IXUSR)
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#define STORAGE_FILE_MODE (S_IRUSR | S_IWUSR)
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#define KNOWN_FREQ_FILENAME ".known_network.freq"
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static char *storage_path = NULL;
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static char *storage_hotspot_path = NULL;
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static int create_dirs(const char *filename)
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{
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struct stat st;
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char *dir;
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const char *prev, *next;
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int err;
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if (filename[0] != '/')
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return -1;
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err = stat(filename, &st);
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if (!err && S_ISREG(st.st_mode))
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return 0;
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dir = l_malloc(strlen(filename) + 1);
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strcpy(dir, "/");
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for (prev = filename; (next = strchr(prev + 1, '/')); prev = next) {
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/* Skip consecutive '/' characters */
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if (next - prev == 1)
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continue;
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strncat(dir, prev + 1, next - prev);
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if (mkdir(dir, STORAGE_DIR_MODE) == -1 && errno != EEXIST) {
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l_free(dir);
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return -1;
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}
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}
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l_free(dir);
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return 0;
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}
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ssize_t read_file(void *buffer, size_t len, const char *path_fmt, ...)
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{
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va_list ap;
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char *path;
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ssize_t r;
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int fd;
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va_start(ap, path_fmt);
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path = l_strdup_vprintf(path_fmt, ap);
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va_end(ap);
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fd = L_TFR(open(path, O_RDONLY));
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l_free(path);
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if (fd == -1)
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return -1;
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r = L_TFR(read(fd, buffer, len));
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L_TFR(close(fd));
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return r;
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}
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/*
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* Write a buffer to a file in a transactionally safe form
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*
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* Given a buffer, write it to a file named after
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* @path_fmt+args. However, to make sure the file contents are
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* consistent (ie: a crash right after opening or during write()
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* doesn't leave a file half baked), the contents are written to a
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* file with a temporary name and when closed, it is renamed to the
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* specified name (@path_fmt+args).
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*/
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ssize_t write_file(const void *buffer, size_t len,
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const char *path_fmt, ...)
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{
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va_list ap;
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char *tmp_path, *path;
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ssize_t r;
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int fd;
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va_start(ap, path_fmt);
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path = l_strdup_vprintf(path_fmt, ap);
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va_end(ap);
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tmp_path = l_strdup_printf("%s.XXXXXX.tmp", path);
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r = -1;
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if (create_dirs(path) != 0)
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goto error_create_dirs;
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fd = L_TFR(mkostemps(tmp_path, 4, O_CLOEXEC));
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if (fd == -1)
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goto error_mkostemps;
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r = L_TFR(write(fd, buffer, len));
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L_TFR(close(fd));
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if (r != (ssize_t) len) {
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r = -1;
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goto error_write;
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}
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/*
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* Now that the file contents are written, rename to the real
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* file name; this way we are uniquely sure that the whole
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* thing is there.
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* conserve @r's value from 'write'
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*/
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if (rename(tmp_path, path) == -1)
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r = -1;
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error_write:
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if (r < 0)
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unlink(tmp_path);
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error_mkostemps:
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error_create_dirs:
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l_free(tmp_path);
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l_free(path);
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return r;
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}
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bool storage_create_dirs(void)
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{
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const char *state_dir;
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char **state_dirs;
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state_dir = getenv("STATE_DIRECTORY");
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if (!state_dir)
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state_dir = DAEMON_STORAGEDIR;
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l_debug("Using state directory %s", state_dir);
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state_dirs = l_strsplit(state_dir, ':');
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if (!state_dirs[0]) {
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l_strv_free(state_dirs);
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return false;
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}
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storage_path = l_strdup(state_dirs[0]);
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storage_hotspot_path = l_strdup_printf("%s/hotspot/", state_dirs[0]);
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l_strv_free(state_dirs);
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if (create_dirs(storage_path)) {
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l_error("Failed to create %s", storage_path);
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return false;
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}
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if (create_dirs(storage_hotspot_path)) {
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l_error("Failed to create %s", storage_hotspot_path);
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return false;
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}
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return true;
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}
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void storage_cleanup_dirs(void)
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{
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l_free(storage_path);
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l_free(storage_hotspot_path);
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}
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char *storage_get_path(const char *format, ...)
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{
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va_list args;
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char *fmt, *str;
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if (!format)
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return l_strdup(storage_path);
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fmt = l_strdup_printf("%s/%s", storage_path, format);
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va_start(args, format);
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str = l_strdup_vprintf(fmt, args);
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va_end(args);
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l_free(fmt);
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return str;
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}
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char *storage_get_hotspot_path(const char *format, ...)
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{
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va_list args;
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char *fmt, *str;
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if (!format)
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return l_strdup(storage_hotspot_path);
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fmt = l_strdup_printf("%s/%s", storage_hotspot_path, format);
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va_start(args, format);
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str = l_strdup_vprintf(fmt, args);
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va_end(args);
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l_free(fmt);
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return str;
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}
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char *storage_get_network_file_path(enum security type, const char *ssid)
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{
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char *path;
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const char *c;
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char *hex = NULL;
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for (c = ssid; *c; c++)
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if (!isalnum(*c) && !strchr("-_ ", *c))
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break;
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if (*c) {
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hex = l_util_hexstring((const unsigned char *) ssid,
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strlen(ssid));
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path = storage_get_path("/=%s.%s", hex, security_to_str(type));
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l_free(hex);
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} else
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path = storage_get_path("/%s.%s", ssid, security_to_str(type));
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return path;
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}
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const char *storage_network_ssid_from_path(const char *path,
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enum security *type)
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{
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const char *filename = strrchr(path, '/');
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const char *c, *end;
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char *decoded;
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static char buf[67];
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if (filename)
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filename++; /* Skip the / */
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else
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filename = path;
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end = strchr(filename, '.');
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if (!end || !security_from_str(end + 1, type))
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return NULL;
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if (filename[0] != '=') {
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if (end == filename || end - filename > 32)
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return NULL;
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for (c = filename; c < end; c++)
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if (!isalnum(*c) && !strchr("-_ ", *c))
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break;
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if (c < end)
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return NULL;
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memcpy(buf, filename, end - filename);
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buf[end - filename] = '\0';
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return buf;
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}
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if (end - filename <= 1 || end - filename > 65)
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return NULL;
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memcpy(buf, filename + 1, end - filename - 1);
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buf[end - filename - 1] = '0';
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buf[end - filename + 0] = '0';
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buf[end - filename + 1] = '\0';
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decoded = (char *) l_util_from_hexstring(buf, NULL);
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if (!decoded)
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return NULL;
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if (!l_utf8_validate(decoded, (end - filename) / 2, NULL)) {
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l_free(decoded);
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return NULL;
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}
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strcpy(buf, decoded);
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l_free(decoded);
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return buf;
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}
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struct l_settings *storage_network_open(enum security type, const char *ssid)
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{
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struct l_settings *settings;
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char *path;
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if (ssid == NULL)
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return NULL;
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path = storage_get_network_file_path(type, ssid);
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settings = l_settings_new();
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if (!l_settings_load_from_file(settings, path)) {
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l_settings_free(settings);
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settings = NULL;
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}
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l_free(path);
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return settings;
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}
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int storage_network_touch(enum security type, const char *ssid)
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{
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char *path;
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int ret;
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if (ssid == NULL)
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return -EINVAL;
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path = storage_get_network_file_path(type, ssid);
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ret = utimensat(0, path, NULL, 0);
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l_free(path);
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if (!ret)
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return 0;
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return -errno;
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}
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void storage_network_sync(enum security type, const char *ssid,
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struct l_settings *settings)
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{
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char *data;
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size_t length = 0;
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char *path;
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path = storage_get_network_file_path(type, ssid);
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data = l_settings_to_data(settings, &length);
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write_file(data, length, "%s", path);
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l_free(data);
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l_free(path);
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}
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int storage_network_remove(enum security type, const char *ssid)
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{
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char *path;
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int ret;
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path = storage_get_network_file_path(type, ssid);
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ret = unlink(path);
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l_free(path);
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return ret < 0 ? -errno : 0;
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}
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struct l_settings *storage_known_frequencies_load(void)
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{
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struct l_settings *known_freqs;
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char *known_freq_file_path;
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known_freqs = l_settings_new();
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known_freq_file_path = storage_get_path("/%s", KNOWN_FREQ_FILENAME);
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if (!l_settings_load_from_file(known_freqs, known_freq_file_path)) {
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l_settings_free(known_freqs);
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known_freqs = NULL;
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}
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l_free(known_freq_file_path);
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return known_freqs;
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}
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void storage_known_frequencies_sync(struct l_settings *known_freqs)
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{
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char *known_freq_file_path;
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char *data;
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size_t len;
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if (!known_freqs)
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return;
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known_freq_file_path = storage_get_path("/%s", KNOWN_FREQ_FILENAME);
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data = l_settings_to_data(known_freqs, &len);
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write_file(data, len, "%s", known_freq_file_path);
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l_free(data);
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l_free(known_freq_file_path);
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}
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