245 lines
7.4 KiB
C
245 lines
7.4 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 (C) 2013 Tom Gundersen <teg@jklm.no>
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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 "link-config.h"
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#include "util.h"
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#include "log.h"
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#include "strv.h"
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#include "path-util.h"
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#include "conf-parser.h"
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#include "conf-files.h"
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struct link_config_ctx {
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LIST_HEAD(link_config, links);
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char **link_dirs;
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usec_t *link_dirs_ts_usec;
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};
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int link_config_ctx_new(link_config_ctx **ret) {
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link_config_ctx *ctx;
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if (!ret)
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return -EINVAL;
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ctx = new0(link_config_ctx, 1);
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if (!ctx)
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return -ENOMEM;
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LIST_HEAD_INIT(ctx->links);
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ctx->link_dirs = strv_new("/etc/net/links",
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"/run/net/links",
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"/usr/lib/net/links",
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NULL);
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if (!ctx->link_dirs) {
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log_error("failed to build link config directory array");
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link_config_ctx_free(ctx);
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return -ENOMEM;
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}
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if (!path_strv_canonicalize_uniq(ctx->link_dirs)) {
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log_error("failed to canonicalize link config directories\n");
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link_config_ctx_free(ctx);
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return -ENOMEM;
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}
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ctx->link_dirs_ts_usec = calloc(strv_length(ctx->link_dirs), sizeof(usec_t));
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if(!ctx->link_dirs_ts_usec) {
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link_config_ctx_free(ctx);
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return -ENOMEM;
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}
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*ret = ctx;
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return 0;
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}
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static void link_configs_free(link_config_ctx *ctx) {
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link_config *link, *link_next;
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if (!ctx)
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return;
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LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
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free(link->filename);
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free(link->match_path);
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free(link->match_driver);
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free(link->match_type);
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free(link->description);
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free(link);
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}
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}
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void link_config_ctx_free(link_config_ctx *ctx) {
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if (!ctx)
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return;
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strv_free(ctx->link_dirs);
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free(ctx->link_dirs_ts_usec);
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link_configs_free(ctx);
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free(ctx);
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return;
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}
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static int load_link(link_config_ctx *ctx, const char *filename) {
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link_config *link;
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FILE *file;
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int r;
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file = fopen(filename, "re");
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if (!file) {
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if (errno == ENOENT)
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return 0;
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else
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return errno;
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}
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link = new0(link_config, 1);
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if (!link) {
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r = log_oom();
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goto failure;
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}
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r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup,
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(void*) link_config_gperf_lookup, false, false, link);
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if (r < 0) {
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log_warning("Colud not parse config file %s: %s", filename, strerror(-r));
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goto failure;
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} else
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log_info("Parsed configuration file %s", filename);
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link->filename = strdup(filename);
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LIST_PREPEND(links, ctx->links, link);
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return 0;
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failure:
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free(link);
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return r;
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}
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int link_config_load(link_config_ctx *ctx) {
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int r;
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char **files, **f;
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link_configs_free(ctx);
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/* update timestamps */
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paths_check_timestamp(ctx->link_dirs, ctx->link_dirs_ts_usec, true);
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r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs);
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if (r < 0) {
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log_error("failed to enumerate link files: %s", strerror(-r));
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return r;
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}
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STRV_FOREACH_BACKWARDS(f, files) {
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r = load_link(ctx, *f);
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if (r < 0)
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return r;
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}
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return 0;
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}
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bool link_config_should_reload(link_config_ctx *ctx) {
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return paths_check_timestamp(ctx->link_dirs, ctx->link_dirs_ts_usec, false);
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}
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static bool match_config(link_config *match, struct udev_device *device) {
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const char *property;
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if (match->match_mac) {
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property = udev_device_get_sysattr_value(device, "address");
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if (!property || !streq(match->match_mac, property)) {
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log_debug("Device MAC address (%s) did not match MACAddress=%s", property, match->match_mac);
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return 0;
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}
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}
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if (match->match_path) {
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property = udev_device_get_property_value(device, "ID_PATH");
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if (!property || !streq(match->match_path, property)) {
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log_debug("Device's persistent path (%s) did not match Path=%s", property, match->match_path);
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return 0;
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}
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}
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if (match->match_driver) {
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property = udev_device_get_driver(device);
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if (!property || !streq(match->match_driver, property)) {
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log_debug("Device driver (%s) did not match Driver=%s", property, match->match_driver);
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return 0;
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}
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}
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if (match->match_type) {
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property = udev_device_get_devtype(device);
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if (!property || !streq(match->match_type, property)) {
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log_debug("Device type (%s) did not match Type=%s", property, match->match_type);
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return 0;
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}
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}
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return 1;
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}
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int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
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link_config *link;
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LIST_FOREACH(links, link, ctx->links) {
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if (!match_config(link, device)) {
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log_info("Config file %s does not apply to device %s", link->filename, udev_device_get_sysname(device));
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} else {
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log_info("Config file %s applies to device %s", link->filename, udev_device_get_sysname(device));
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*ret = link;
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return 0;
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}
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}
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return -ENOENT;
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}
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int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device) {
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const char *name;
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int r;
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name = udev_device_get_sysname(device);
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if (!name)
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return -EINVAL;
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log_info("Configuring %s", name);
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if (config->description) {
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r = udev_device_set_sysattr_value(device, "ifalias", config->description);
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if (r < 0)
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log_warning("Could not set description of %s to '%s': %s", name, config->description, strerror(-r));
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else
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log_info("Set link description of %s to '%s'", name, config->description);
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}
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return 0;
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}
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