diff options
Diffstat (limited to 'src/udev/net/link-config.c')
| -rw-r--r-- | src/udev/net/link-config.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c new file mode 100644 index 0000000000..7686d87f80 --- /dev/null +++ b/src/udev/net/link-config.c @@ -0,0 +1,244 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright (C) 2013 Tom Gundersen <teg@jklm.no> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include "link-config.h" + +#include "util.h" +#include "log.h" +#include "strv.h" +#include "path-util.h" +#include "conf-parser.h" +#include "conf-files.h" + +struct link_config_ctx { + LIST_HEAD(link_config, links); + + char **link_dirs; + usec_t *link_dirs_ts_usec; +}; + +int link_config_ctx_new(link_config_ctx **ret) { + link_config_ctx *ctx; + + if (!ret) + return -EINVAL; + + ctx = new0(link_config_ctx, 1); + if (!ctx) + return -ENOMEM; + + LIST_HEAD_INIT(ctx->links); + + ctx->link_dirs = strv_new("/etc/net/links", + "/run/net/links", + "/usr/lib/net/links", + NULL); + if (!ctx->link_dirs) { + log_error("failed to build link config directory array"); + link_config_ctx_free(ctx); + return -ENOMEM; + } + if (!path_strv_canonicalize_uniq(ctx->link_dirs)) { + log_error("failed to canonicalize link config directories\n"); + link_config_ctx_free(ctx); + return -ENOMEM; + } + + ctx->link_dirs_ts_usec = calloc(strv_length(ctx->link_dirs), sizeof(usec_t)); + if(!ctx->link_dirs_ts_usec) { + link_config_ctx_free(ctx); + return -ENOMEM; + } + + *ret = ctx; + return 0; +} + +static void link_configs_free(link_config_ctx *ctx) { + link_config *link, *link_next; + + if (!ctx) + return; + + LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { + free(link->filename); + free(link->match_path); + free(link->match_driver); + free(link->match_type); + free(link->description); + + free(link); + } +} + +void link_config_ctx_free(link_config_ctx *ctx) { + if (!ctx) + return; + + strv_free(ctx->link_dirs); + free(ctx->link_dirs_ts_usec); + link_configs_free(ctx); + + free(ctx); + + return; +} + +static int load_link(link_config_ctx *ctx, const char *filename) { + link_config *link; + FILE *file; + int r; + + file = fopen(filename, "re"); + if (!file) { + if (errno == ENOENT) + return 0; + else + return errno; + } + + link = new0(link_config, 1); + if (!link) { + r = log_oom(); + goto failure; + } + + r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup, + (void*) link_config_gperf_lookup, false, false, link); + if (r < 0) { + log_warning("Colud not parse config file %s: %s", filename, strerror(-r)); + goto failure; + } else + log_info("Parsed configuration file %s", filename); + + link->filename = strdup(filename); + + LIST_PREPEND(links, ctx->links, link); + + return 0; + +failure: + free(link); + return r; +} + +int link_config_load(link_config_ctx *ctx) { + int r; + char **files, **f; + + link_configs_free(ctx); + + /* update timestamps */ + paths_check_timestamp(ctx->link_dirs, ctx->link_dirs_ts_usec, true); + + r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs); + if (r < 0) { + log_error("failed to enumerate link files: %s", strerror(-r)); + return r; + } + + STRV_FOREACH_BACKWARDS(f, files) { + r = load_link(ctx, *f); + if (r < 0) + return r; + } + + return 0; +} + +bool link_config_should_reload(link_config_ctx *ctx) { + return paths_check_timestamp(ctx->link_dirs, ctx->link_dirs_ts_usec, false); +} + +static bool match_config(link_config *match, struct udev_device *device) { + const char *property; + + if (match->match_mac) { + property = udev_device_get_sysattr_value(device, "address"); + if (!property || !streq(match->match_mac, property)) { + log_debug("Device MAC address (%s) did not match MACAddress=%s", property, match->match_mac); + return 0; + } + } + + if (match->match_path) { + property = udev_device_get_property_value(device, "ID_PATH"); + if (!property || !streq(match->match_path, property)) { + log_debug("Device's persistent path (%s) did not match Path=%s", property, match->match_path); + return 0; + } + } + + if (match->match_driver) { + property = udev_device_get_driver(device); + if (!property || !streq(match->match_driver, property)) { + log_debug("Device driver (%s) did not match Driver=%s", property, match->match_driver); + return 0; + } + } + + if (match->match_type) { + property = udev_device_get_devtype(device); + if (!property || !streq(match->match_type, property)) { + log_debug("Device type (%s) did not match Type=%s", property, match->match_type); + return 0; + } + } + + return 1; +} + +int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) { + link_config *link; + + LIST_FOREACH(links, link, ctx->links) { + if (!match_config(link, device)) { + log_info("Config file %s does not apply to device %s", link->filename, udev_device_get_sysname(device)); + } else { + log_info("Config file %s applies to device %s", link->filename, udev_device_get_sysname(device)); + *ret = link; + return 0; + } + } + + return -ENOENT; +} + +int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device) { + const char *name; + int r; + + name = udev_device_get_sysname(device); + if (!name) + return -EINVAL; + + log_info("Configuring %s", name); + + if (config->description) { + r = udev_device_set_sysattr_value(device, "ifalias", config->description); + if (r < 0) + log_warning("Could not set description of %s to '%s': %s", name, config->description, strerror(-r)); + else + log_info("Set link description of %s to '%s'", name, config->description); + } + + return 0; +} |