diff options
Diffstat (limited to 'src/network/wait-online')
| -rw-r--r-- | src/network/wait-online/link.c | 153 | ||||
| -rw-r--r-- | src/network/wait-online/link.h | 30 | ||||
| -rw-r--r-- | src/network/wait-online/manager.c | 369 | ||||
| -rw-r--r-- | src/network/wait-online/manager.h | 42 | ||||
| -rw-r--r-- | src/network/wait-online/wait-online.c | 224 |
5 files changed, 818 insertions, 0 deletions
diff --git a/src/network/wait-online/link.c b/src/network/wait-online/link.c new file mode 100644 index 0000000..529fc9f --- /dev/null +++ b/src/network/wait-online/link.c @@ -0,0 +1,153 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "sd-network.h" + +#include "alloc-util.h" +#include "hashmap.h" +#include "link.h" +#include "manager.h" +#include "string-util.h" + +int link_new(Manager *m, Link **ret, int ifindex, const char *ifname) { + _cleanup_(link_freep) Link *l = NULL; + _cleanup_free_ char *n = NULL; + int r; + + assert(m); + assert(ifindex > 0); + + r = hashmap_ensure_allocated(&m->links, NULL); + if (r < 0) + return r; + + r = hashmap_ensure_allocated(&m->links_by_name, &string_hash_ops); + if (r < 0) + return r; + + n = strdup(ifname); + if (!n) + return -ENOMEM; + + l = new(Link, 1); + if (!l) + return -ENOMEM; + + *l = (Link) { + .manager = m, + .ifname = TAKE_PTR(n), + .ifindex = ifindex, + .required_operstate = LINK_OPERSTATE_RANGE_DEFAULT, + }; + + r = hashmap_put(m->links_by_name, l->ifname, l); + if (r < 0) + return r; + + r = hashmap_put(m->links, INT_TO_PTR(ifindex), l); + if (r < 0) + return r; + + if (ret) + *ret = l; + + TAKE_PTR(l); + return 0; +} + +Link *link_free(Link *l) { + + if (!l) + return NULL; + + if (l->manager) { + hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex)); + hashmap_remove(l->manager->links_by_name, l->ifname); + } + + free(l->state); + free(l->ifname); + return mfree(l); + } + +int link_update_rtnl(Link *l, sd_netlink_message *m) { + const char *ifname; + int r; + + assert(l); + assert(l->manager); + assert(m); + + r = sd_rtnl_message_link_get_flags(m, &l->flags); + if (r < 0) + return r; + + r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname); + if (r < 0) + return r; + + if (!streq(l->ifname, ifname)) { + char *new_ifname; + + new_ifname = strdup(ifname); + if (!new_ifname) + return -ENOMEM; + + assert_se(hashmap_remove(l->manager->links_by_name, l->ifname) == l); + free_and_replace(l->ifname, new_ifname); + + r = hashmap_put(l->manager->links_by_name, l->ifname, l); + if (r < 0) + return r; + } + + return 0; +} + +int link_update_monitor(Link *l) { + _cleanup_free_ char *operstate = NULL, *required_operstate = NULL, *state = NULL; + int r, ret = 0; + + assert(l); + assert(l->ifname); + + r = sd_network_link_get_required_for_online(l->ifindex); + if (r < 0) + ret = log_link_debug_errno(l, r, "Failed to determine whether the link is required for online or not, " + "ignoring: %m"); + else + l->required_for_online = r > 0; + + r = sd_network_link_get_required_operstate_for_online(l->ifindex, &required_operstate); + if (r < 0) + ret = log_link_debug_errno(l, r, "Failed to get required operational state, ignoring: %m"); + else if (isempty(required_operstate)) + l->required_operstate = LINK_OPERSTATE_RANGE_DEFAULT; + else { + r = parse_operational_state_range(required_operstate, &l->required_operstate); + if (r < 0) + ret = log_link_debug_errno(l, SYNTHETIC_ERRNO(EINVAL), + "Failed to parse required operational state, ignoring: %m"); + } + + r = sd_network_link_get_operational_state(l->ifindex, &operstate); + if (r < 0) + ret = log_link_debug_errno(l, r, "Failed to get operational state, ignoring: %m"); + else { + LinkOperationalState s; + + s = link_operstate_from_string(operstate); + if (s < 0) + ret = log_link_debug_errno(l, SYNTHETIC_ERRNO(EINVAL), + "Failed to parse operational state, ignoring: %m"); + else + l->operational_state = s; + } + + r = sd_network_link_get_setup_state(l->ifindex, &state); + if (r < 0) + ret = log_link_debug_errno(l, r, "Failed to get setup state, ignoring: %m"); + else + free_and_replace(l->state, state); + + return ret; +} diff --git a/src/network/wait-online/link.h b/src/network/wait-online/link.h new file mode 100644 index 0000000..3aa8357 --- /dev/null +++ b/src/network/wait-online/link.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include "sd-netlink.h" + +#include "log-link.h" +#include "network-util.h" + +typedef struct Link Link; +typedef struct Manager Manager; + +struct Link { + Manager *manager; + + int ifindex; + char *ifname; + unsigned flags; + + bool required_for_online; + LinkOperationalStateRange required_operstate; + LinkOperationalState operational_state; + char *state; +}; + +int link_new(Manager *m, Link **ret, int ifindex, const char *ifname); +Link *link_free(Link *l); +int link_update_rtnl(Link *l, sd_netlink_message *m); +int link_update_monitor(Link *l); + +DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_free); diff --git a/src/network/wait-online/manager.c b/src/network/wait-online/manager.c new file mode 100644 index 0000000..79994bd --- /dev/null +++ b/src/network/wait-online/manager.c @@ -0,0 +1,369 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <netinet/ether.h> +#include <linux/if.h> +#include <fnmatch.h> + +#include "alloc-util.h" +#include "link.h" +#include "manager.h" +#include "netlink-util.h" +#include "network-internal.h" +#include "strv.h" +#include "time-util.h" +#include "util.h" + +static bool manager_ignore_link(Manager *m, Link *link) { + assert(m); + assert(link); + + /* always ignore the loopback interface */ + if (link->flags & IFF_LOOPBACK) + return true; + + /* if interfaces are given on the command line, ignore all others */ + if (m->interfaces && !hashmap_contains(m->interfaces, link->ifname)) + return true; + + if (!link->required_for_online) + return true; + + /* ignore interfaces we explicitly are asked to ignore */ + return strv_fnmatch(m->ignore, link->ifname); +} + +static int manager_link_is_online(Manager *m, Link *l, LinkOperationalStateRange s) { + /* This returns the following: + * -EAGAIN: not processed by udev or networkd + * 0: operstate is not enough + * 1: online */ + + if (!l->state) + return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN), + "link has not yet been processed by udev"); + + if (STR_IN_SET(l->state, "configuring", "pending")) + return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN), + "link is being processed by networkd"); + + if (s.min < 0) + s.min = m->required_operstate.min >= 0 ? m->required_operstate.min + : l->required_operstate.min; + + if (s.max < 0) + s.max = m->required_operstate.max >= 0 ? m->required_operstate.max + : l->required_operstate.max; + + if (l->operational_state < s.min || l->operational_state > s.max) { + log_link_debug(l, "Operational state '%s' is not in range ['%s':'%s']", + link_operstate_to_string(l->operational_state), + link_operstate_to_string(s.min), link_operstate_to_string(s.max)); + return 0; + } + + return 1; +} + +bool manager_configured(Manager *m) { + bool one_ready = false; + const char *ifname; + void *p; + Link *l; + int r; + + if (!hashmap_isempty(m->interfaces)) { + /* wait for all the links given on the command line to appear */ + HASHMAP_FOREACH_KEY(p, ifname, m->interfaces) { + LinkOperationalStateRange *range = p; + + l = hashmap_get(m->links_by_name, ifname); + if (!l && range->min == LINK_OPERSTATE_MISSING) { + one_ready = true; + continue; + } + + if (!l) { + log_debug("still waiting for %s", ifname); + if (!m->any) + return false; + continue; + } + + if (manager_link_is_online(m, l, *range) <= 0) { + if (!m->any) + return false; + continue; + } + + one_ready = true; + } + + /* all interfaces given by the command line are online, or + * one of the specified interfaces is online. */ + return one_ready; + } + + /* wait for all links networkd manages to be in admin state 'configured' + * and at least one link to gain a carrier */ + HASHMAP_FOREACH(l, m->links) { + if (manager_ignore_link(m, l)) { + log_link_debug(l, "link is ignored"); + continue; + } + + r = manager_link_is_online(m, l, + (LinkOperationalStateRange) { _LINK_OPERSTATE_INVALID, + _LINK_OPERSTATE_INVALID }); + if (r < 0 && !m->any) + return false; + if (r > 0) + /* we wait for at least one link to be ready, + * regardless of who manages it */ + one_ready = true; + } + + return one_ready; +} + +static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { + Manager *m = userdata; + uint16_t type; + Link *l; + const char *ifname; + int ifindex, r; + + assert(rtnl); + assert(m); + assert(mm); + + r = sd_netlink_message_get_type(mm, &type); + if (r < 0) { + log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m"); + return 0; + } + + r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); + if (r < 0) { + log_warning_errno(r, "rtnl: Could not get ifindex from link, ignoring: %m"); + return 0; + } else if (ifindex <= 0) { + log_warning("rtnl: received link message with invalid ifindex %d, ignoring", ifindex); + return 0; + } + + r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname); + if (r < 0) { + log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m"); + return 0; + } + + l = hashmap_get(m->links, INT_TO_PTR(ifindex)); + + switch (type) { + + case RTM_NEWLINK: + if (!l) { + log_debug("Found link %i", ifindex); + + r = link_new(m, &l, ifindex, ifname); + if (r < 0) + return log_error_errno(r, "Failed to create link object: %m"); + } + + r = link_update_rtnl(l, mm); + if (r < 0) + log_link_warning_errno(l, r, "Failed to process RTNL link message, ignoring: %m"); + + r = link_update_monitor(l); + if (r < 0 && r != -ENODATA) + log_link_warning_errno(l, r, "Failed to update link state, ignoring: %m"); + + break; + + case RTM_DELLINK: + if (l) { + log_link_debug(l, "Removing link"); + link_free(l); + } + + break; + } + + return 0; +} + +static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { + Manager *m = userdata; + int r; + + r = manager_process_link(rtnl, mm, m); + if (r < 0) + return r; + + if (manager_configured(m)) + sd_event_exit(m->event, 0); + + return 1; +} + +static int manager_rtnl_listen(Manager *m) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; + sd_netlink_message *i; + int r; + + assert(m); + + /* First, subscribe to interfaces coming and going */ + r = sd_netlink_open(&m->rtnl); + if (r < 0) + return r; + + r = sd_netlink_attach_event(m->rtnl, m->event, 0); + if (r < 0) + return r; + + r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, on_rtnl_event, NULL, m, "wait-online-on-NEWLINK"); + if (r < 0) + return r; + + r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, on_rtnl_event, NULL, m, "wait-online-on-DELLINK"); + if (r < 0) + return r; + + /* Then, enumerate all links */ + r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); + if (r < 0) + return r; + + r = sd_netlink_message_request_dump(req, true); + if (r < 0) + return r; + + r = sd_netlink_call(m->rtnl, req, 0, &reply); + if (r < 0) + return r; + + for (i = reply; i; i = sd_netlink_message_next(i)) { + r = manager_process_link(m->rtnl, i, m); + if (r < 0) + return r; + } + + return r; +} + +static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + Manager *m = userdata; + Link *l; + int r; + + assert(m); + + sd_network_monitor_flush(m->network_monitor); + + HASHMAP_FOREACH(l, m->links) { + r = link_update_monitor(l); + if (r < 0 && r != -ENODATA) + log_link_warning_errno(l, r, "Failed to update link state, ignoring: %m"); + } + + if (manager_configured(m)) + sd_event_exit(m->event, 0); + + return 0; +} + +static int manager_network_monitor_listen(Manager *m) { + int r, fd, events; + + assert(m); + + r = sd_network_monitor_new(&m->network_monitor, NULL); + if (r < 0) + return r; + + fd = sd_network_monitor_get_fd(m->network_monitor); + if (fd < 0) + return fd; + + events = sd_network_monitor_get_events(m->network_monitor); + if (events < 0) + return events; + + r = sd_event_add_io(m->event, &m->network_monitor_event_source, + fd, events, &on_network_event, m); + if (r < 0) + return r; + + return 0; +} + +int manager_new(Manager **ret, Hashmap *interfaces, char **ignore, + LinkOperationalStateRange required_operstate, + bool any, usec_t timeout) { + _cleanup_(manager_freep) Manager *m = NULL; + int r; + + assert(ret); + + m = new(Manager, 1); + if (!m) + return -ENOMEM; + + *m = (Manager) { + .interfaces = interfaces, + .ignore = ignore, + .required_operstate = required_operstate, + .any = any, + }; + + r = sd_event_default(&m->event); + if (r < 0) + return r; + + (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); + (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); + + if (timeout > 0) { + usec_t usec; + + usec = now(clock_boottime_or_monotonic()) + timeout; + + r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT)); + if (r < 0) + return r; + } + + sd_event_set_watchdog(m->event, true); + + r = manager_network_monitor_listen(m); + if (r < 0) + return r; + + r = manager_rtnl_listen(m); + if (r < 0) + return r; + + *ret = TAKE_PTR(m); + + return 0; +} + +void manager_free(Manager *m) { + if (!m) + return; + + hashmap_free_with_destructor(m->links, link_free); + hashmap_free(m->links_by_name); + + sd_event_source_unref(m->network_monitor_event_source); + sd_network_monitor_unref(m->network_monitor); + + sd_event_source_unref(m->rtnl_event_source); + sd_netlink_unref(m->rtnl); + + sd_event_unref(m->event); + free(m); + + return; +} diff --git a/src/network/wait-online/manager.h b/src/network/wait-online/manager.h new file mode 100644 index 0000000..f5e8353 --- /dev/null +++ b/src/network/wait-online/manager.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include "sd-event.h" +#include "sd-netlink.h" +#include "sd-network.h" + +#include "hashmap.h" +#include "network-util.h" +#include "time-util.h" + +typedef struct Manager Manager; +typedef struct Link Link; + +struct Manager { + Hashmap *links; + Hashmap *links_by_name; + + /* Do not free the two members below. */ + Hashmap *interfaces; + char **ignore; + + LinkOperationalStateRange required_operstate; + bool any; + + sd_netlink *rtnl; + sd_event_source *rtnl_event_source; + + sd_network_monitor *network_monitor; + sd_event_source *network_monitor_event_source; + + sd_event *event; +}; + +void manager_free(Manager *m); +int manager_new(Manager **ret, Hashmap *interfaces, char **ignore, + LinkOperationalStateRange required_operstate, + bool any, usec_t timeout); + +DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); + +bool manager_configured(Manager *m); diff --git a/src/network/wait-online/wait-online.c b/src/network/wait-online/wait-online.c new file mode 100644 index 0000000..c2bdcd4 --- /dev/null +++ b/src/network/wait-online/wait-online.c @@ -0,0 +1,224 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <getopt.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include "sd-daemon.h" + +#include "daemon-util.h" +#include "main-func.h" +#include "manager.h" +#include "pretty-print.h" +#include "signal-util.h" +#include "socket-util.h" +#include "strv.h" + +static bool arg_quiet = false; +static usec_t arg_timeout = 120 * USEC_PER_SEC; +static Hashmap *arg_interfaces = NULL; +static char **arg_ignore = NULL; +static LinkOperationalStateRange arg_required_operstate = { _LINK_OPERSTATE_INVALID, _LINK_OPERSTATE_INVALID }; +static bool arg_any = false; + +STATIC_DESTRUCTOR_REGISTER(arg_interfaces, hashmap_free_free_freep); +STATIC_DESTRUCTOR_REGISTER(arg_ignore, strv_freep); + +static int help(void) { + _cleanup_free_ char *link = NULL; + int r; + + r = terminal_urlify_man("systemd-networkd-wait-online.service", "8", &link); + if (r < 0) + return log_oom(); + + printf("%s [OPTIONS...]\n\n" + "Block until network is configured.\n\n" + " -h --help Show this help\n" + " --version Print version string\n" + " -q --quiet Do not show status information\n" + " -i --interface=INTERFACE[:MIN_OPERSTATE[:MAX_OPERSTATE]]\n" + " Block until at least these interfaces have appeared\n" + " --ignore=INTERFACE Don't take these interfaces into account\n" + " -o --operational-state=MIN_OPERSTATE[:MAX_OPERSTATE]\n" + " Required operational state\n" + " --any Wait until at least one of the interfaces is online\n" + " --timeout=SECS Maximum time to wait for network connectivity\n" + "\nSee the %s for details.\n" + , program_invocation_short_name + , link + ); + + return 0; +} + +static int parse_interface_with_operstate_range(const char *str) { + _cleanup_free_ char *ifname = NULL; + _cleanup_free_ LinkOperationalStateRange *range; + const char *p; + int r; + + assert(str); + + range = new(LinkOperationalStateRange, 1); + if (!range) + return log_oom(); + + p = strchr(str, ':'); + if (p) { + r = parse_operational_state_range(p + 1, range); + if (r < 0) + log_error_errno(r, "Invalid operational state range '%s'", p + 1); + + ifname = strndup(optarg, p - optarg); + } else { + range->min = _LINK_OPERSTATE_INVALID; + range->max = _LINK_OPERSTATE_INVALID; + ifname = strdup(str); + } + if (!ifname) + return log_oom(); + + if (!ifname_valid(ifname)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Invalid interface name '%s'", ifname); + + r = hashmap_ensure_allocated(&arg_interfaces, &string_hash_ops); + if (r < 0) + return log_oom(); + + r = hashmap_put(arg_interfaces, ifname, TAKE_PTR(range)); + if (r < 0) + return log_error_errno(r, "Failed to store interface name: %m"); + if (r == 0) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Interface name %s is already specified", ifname); + + TAKE_PTR(ifname); + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_VERSION = 0x100, + ARG_IGNORE, + ARG_ANY, + ARG_TIMEOUT, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "quiet", no_argument, NULL, 'q' }, + { "interface", required_argument, NULL, 'i' }, + { "ignore", required_argument, NULL, ARG_IGNORE }, + { "operational-state", required_argument, NULL, 'o' }, + { "any", no_argument, NULL, ARG_ANY }, + { "timeout", required_argument, NULL, ARG_TIMEOUT }, + {} + }; + + int c, r; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "hi:qo:", options, NULL)) >= 0) + + switch (c) { + + case 'h': + help(); + return 0; + + case 'q': + arg_quiet = true; + break; + + case ARG_VERSION: + return version(); + + case 'i': + r = parse_interface_with_operstate_range(optarg); + if (r < 0) + return r; + break; + + case ARG_IGNORE: + if (strv_extend(&arg_ignore, optarg) < 0) + return log_oom(); + + break; + + case 'o': { + LinkOperationalStateRange range; + + r = parse_operational_state_range(optarg, &range); + if (r < 0) + return log_error_errno(r, "Invalid operational state range '%s'", optarg); + + arg_required_operstate = range; + + break; + } + case ARG_ANY: + arg_any = true; + break; + + case ARG_TIMEOUT: + r = parse_sec(optarg, &arg_timeout); + if (r < 0) + return r; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + return 1; +} + +static int run(int argc, char *argv[]) { + _cleanup_(manager_freep) Manager *m = NULL; + _cleanup_(notify_on_cleanup) const char *notify_message = NULL; + int r; + + log_setup_service(); + + umask(0022); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + if (arg_quiet) + log_set_max_level(LOG_ERR); + + assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); + + r = manager_new(&m, arg_interfaces, arg_ignore, arg_required_operstate, arg_any, arg_timeout); + if (r < 0) + return log_error_errno(r, "Could not create manager: %m"); + + if (manager_configured(m)) + goto success; + + notify_message = notify_start("READY=1\n" + "STATUS=Waiting for network connections...", + "STATUS=Failed to wait for network connectivity..."); + + r = sd_event_loop(m->event); + if (r < 0) + return log_error_errno(r, "Event loop failed: %m"); + +success: + notify_message = "STATUS=All interfaces configured..."; + + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |