| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <poll.h> |
| #include <sys/inotify.h> |
| |
| #include "sd-network.h" |
| |
| #include "alloc-util.h" |
| #include "env-file.h" |
| #include "fd-util.h" |
| #include "fs-util.h" |
| #include "inotify-util.h" |
| #include "macro.h" |
| #include "parse-util.h" |
| #include "stdio-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| |
| static int network_get_string(const char *field, char **ret) { |
| _cleanup_free_ char *s = NULL; |
| int r; |
| |
| assert_return(ret, -EINVAL); |
| |
| r = parse_env_file(NULL, "/run/systemd/netif/state", field, &s); |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *ret = TAKE_PTR(s); |
| return 0; |
| } |
| |
| int sd_network_get_operational_state(char **ret) { |
| return network_get_string("OPER_STATE", ret); |
| } |
| |
| int sd_network_get_carrier_state(char **ret) { |
| return network_get_string("CARRIER_STATE", ret); |
| } |
| |
| int sd_network_get_address_state(char **ret) { |
| return network_get_string("ADDRESS_STATE", ret); |
| } |
| |
| int sd_network_get_ipv4_address_state(char **ret) { |
| return network_get_string("IPV4_ADDRESS_STATE", ret); |
| } |
| |
| int sd_network_get_ipv6_address_state(char **ret) { |
| return network_get_string("IPV6_ADDRESS_STATE", ret); |
| } |
| |
| int sd_network_get_online_state(char **ret) { |
| return network_get_string("ONLINE_STATE", ret); |
| } |
| |
| static int network_get_strv(const char *key, char ***ret) { |
| _cleanup_strv_free_ char **a = NULL; |
| _cleanup_free_ char *s = NULL; |
| int r; |
| |
| assert_return(ret, -EINVAL); |
| |
| r = parse_env_file(NULL, "/run/systemd/netif/state", key, &s); |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| a = strv_split(s, NULL); |
| if (!a) |
| return -ENOMEM; |
| |
| strv_uniq(a); |
| r = (int) strv_length(a); |
| |
| *ret = TAKE_PTR(a); |
| return r; |
| } |
| |
| int sd_network_get_dns(char ***ret) { |
| return network_get_strv("DNS", ret); |
| } |
| |
| int sd_network_get_ntp(char ***ret) { |
| return network_get_strv("NTP", ret); |
| } |
| |
| int sd_network_get_search_domains(char ***ret) { |
| return network_get_strv("DOMAINS", ret); |
| } |
| |
| int sd_network_get_route_domains(char ***ret) { |
| return network_get_strv("ROUTE_DOMAINS", ret); |
| } |
| |
| static int network_link_get_string(int ifindex, const char *field, char **ret) { |
| char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)]; |
| _cleanup_free_ char *s = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| xsprintf(path, "/run/systemd/netif/links/%i", ifindex); |
| |
| r = parse_env_file(NULL, path, field, &s); |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *ret = TAKE_PTR(s); |
| return 0; |
| } |
| |
| static int network_link_get_boolean(int ifindex, const char *key) { |
| _cleanup_free_ char *s = NULL; |
| int r; |
| |
| r = network_link_get_string(ifindex, key, &s); |
| if (r < 0) |
| return r; |
| |
| return parse_boolean(s); |
| } |
| |
| static int network_link_get_strv(int ifindex, const char *key, char ***ret) { |
| _cleanup_strv_free_ char **a = NULL; |
| _cleanup_free_ char *s = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| r = network_link_get_string(ifindex, key, &s); |
| if (r < 0) |
| return r; |
| |
| a = strv_split(s, NULL); |
| if (!a) |
| return -ENOMEM; |
| |
| strv_uniq(a); |
| r = (int) strv_length(a); |
| |
| *ret = TAKE_PTR(a); |
| return r; |
| } |
| |
| int sd_network_link_get_setup_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "ADMIN_STATE", ret); |
| } |
| |
| int sd_network_link_get_network_file(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "NETWORK_FILE", ret); |
| } |
| |
| int sd_network_link_get_network_file_dropins(int ifindex, char ***ret) { |
| _cleanup_free_ char **sv = NULL, *joined = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| r = network_link_get_string(ifindex, "NETWORK_FILE_DROPINS", &joined); |
| if (r < 0) |
| return r; |
| |
| r = strv_split_full(&sv, joined, ":", EXTRACT_CUNESCAPE); |
| if (r < 0) |
| return r; |
| |
| *ret = TAKE_PTR(sv); |
| return 0; |
| } |
| |
| int sd_network_link_get_operational_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "OPER_STATE", ret); |
| } |
| |
| int sd_network_link_get_required_family_for_online(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "REQUIRED_FAMILY_FOR_ONLINE", ret); |
| } |
| |
| int sd_network_link_get_carrier_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "CARRIER_STATE", ret); |
| } |
| |
| int sd_network_link_get_address_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "ADDRESS_STATE", ret); |
| } |
| |
| int sd_network_link_get_ipv4_address_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "IPV4_ADDRESS_STATE", ret); |
| } |
| |
| int sd_network_link_get_ipv6_address_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "IPV6_ADDRESS_STATE", ret); |
| } |
| |
| int sd_network_link_get_online_state(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "ONLINE_STATE", ret); |
| } |
| |
| int sd_network_link_get_dhcp6_client_iaid_string(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "DHCP6_CLIENT_IAID", ret); |
| } |
| |
| int sd_network_link_get_dhcp6_client_duid_string(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "DHCP6_CLIENT_DUID", ret); |
| } |
| |
| int sd_network_link_get_required_for_online(int ifindex) { |
| return network_link_get_boolean(ifindex, "REQUIRED_FOR_ONLINE"); |
| } |
| |
| int sd_network_link_get_required_operstate_for_online(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "REQUIRED_OPER_STATE_FOR_ONLINE", ret); |
| } |
| |
| int sd_network_link_get_activation_policy(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "ACTIVATION_POLICY", ret); |
| } |
| |
| int sd_network_link_get_llmnr(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "LLMNR", ret); |
| } |
| |
| int sd_network_link_get_mdns(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "MDNS", ret); |
| } |
| |
| int sd_network_link_get_dns_over_tls(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "DNS_OVER_TLS", ret); |
| } |
| |
| int sd_network_link_get_dnssec(int ifindex, char **ret) { |
| return network_link_get_string(ifindex, "DNSSEC", ret); |
| } |
| |
| int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***ret) { |
| return network_link_get_strv(ifindex, "DNSSEC_NTA", ret); |
| } |
| |
| int sd_network_link_get_dns(int ifindex, char ***ret) { |
| return network_link_get_strv(ifindex, "DNS", ret); |
| } |
| |
| int sd_network_link_get_ntp(int ifindex, char ***ret) { |
| return network_link_get_strv(ifindex, "NTP", ret); |
| } |
| |
| int sd_network_link_get_sip(int ifindex, char ***ret) { |
| return network_link_get_strv(ifindex, "SIP", ret); |
| } |
| |
| int sd_network_link_get_search_domains(int ifindex, char ***ret) { |
| return network_link_get_strv(ifindex, "DOMAINS", ret); |
| } |
| |
| int sd_network_link_get_route_domains(int ifindex, char ***ret) { |
| return network_link_get_strv(ifindex, "ROUTE_DOMAINS", ret); |
| } |
| |
| int sd_network_link_get_dns_default_route(int ifindex) { |
| return network_link_get_boolean(ifindex, "DNS_DEFAULT_ROUTE"); |
| } |
| |
| static int network_link_get_ifindexes(int ifindex, const char *key, int **ret) { |
| _cleanup_free_ int *ifis = NULL; |
| _cleanup_free_ char *s = NULL; |
| size_t c = 0; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| r = network_link_get_string(ifindex, key, &s); |
| if (r < 0) |
| return r; |
| |
| for (const char *x = s;;) { |
| _cleanup_free_ char *word = NULL; |
| |
| r = extract_first_word(&x, &word, NULL, 0); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| |
| if (!GREEDY_REALLOC(ifis, c + 2)) |
| return -ENOMEM; |
| |
| r = ifis[c++] = parse_ifindex(word); |
| if (r < 0) |
| return r; |
| } |
| |
| if (ifis) |
| ifis[c] = 0; /* Let's add a 0 ifindex to the end, to be nice */ |
| |
| *ret = TAKE_PTR(ifis); |
| return c; |
| } |
| |
| int sd_network_link_get_carrier_bound_to(int ifindex, int **ret) { |
| return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_TO", ret); |
| } |
| |
| int sd_network_link_get_carrier_bound_by(int ifindex, int **ret) { |
| return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_BY", ret); |
| } |
| |
| int sd_network_link_get_stat(int ifindex, struct stat *ret) { |
| char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)]; |
| struct stat st; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| |
| xsprintf(path, "/run/systemd/netif/links/%i", ifindex); |
| |
| if (stat(path, &st) < 0) |
| return -errno; |
| |
| if (ret) |
| *ret = st; |
| |
| return 0; |
| } |
| |
| static int MONITOR_TO_FD(sd_network_monitor *m) { |
| return (int) (unsigned long) m - 1; |
| } |
| |
| static sd_network_monitor* FD_TO_MONITOR(int fd) { |
| return (sd_network_monitor*) (unsigned long) (fd + 1); |
| } |
| |
| static int monitor_add_inotify_watch(int fd) { |
| int wd; |
| |
| wd = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); |
| if (wd >= 0) |
| return wd; |
| else if (errno != ENOENT) |
| return -errno; |
| |
| wd = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR); |
| if (wd >= 0) |
| return wd; |
| else if (errno != ENOENT) |
| return -errno; |
| |
| wd = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR); |
| if (wd < 0) |
| return -errno; |
| |
| return wd; |
| } |
| |
| int sd_network_monitor_new(sd_network_monitor **m, const char *category) { |
| _cleanup_close_ int fd = -EBADF; |
| int k; |
| bool good = false; |
| |
| assert_return(m, -EINVAL); |
| |
| fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
| if (fd < 0) |
| return -errno; |
| |
| if (!category || streq(category, "links")) { |
| k = monitor_add_inotify_watch(fd); |
| if (k < 0) |
| return k; |
| |
| good = true; |
| } |
| |
| if (!good) |
| return -EINVAL; |
| |
| *m = FD_TO_MONITOR(TAKE_FD(fd)); |
| return 0; |
| } |
| |
| sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { |
| if (m) |
| (void) close_nointr(MONITOR_TO_FD(m)); |
| |
| return NULL; |
| } |
| |
| int sd_network_monitor_flush(sd_network_monitor *m) { |
| union inotify_event_buffer buffer; |
| ssize_t l; |
| int fd; |
| |
| assert_return(m, -EINVAL); |
| |
| fd = MONITOR_TO_FD(m); |
| |
| l = read(fd, &buffer, sizeof(buffer)); |
| if (l < 0) { |
| if (ERRNO_IS_TRANSIENT(errno)) |
| return 0; |
| |
| return -errno; |
| } |
| |
| FOREACH_INOTIFY_EVENT(e, buffer, l) { |
| if (e->mask & IN_ISDIR) { |
| int wd; |
| |
| wd = monitor_add_inotify_watch(fd); |
| if (wd < 0) |
| return wd; |
| |
| if (wd != e->wd) { |
| if (inotify_rm_watch(fd, e->wd) < 0) |
| return -errno; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| int sd_network_monitor_get_fd(sd_network_monitor *m) { |
| assert_return(m, -EINVAL); |
| |
| return MONITOR_TO_FD(m); |
| } |
| |
| int sd_network_monitor_get_events(sd_network_monitor *m) { |
| assert_return(m, -EINVAL); |
| |
| /* For now we will only return POLLIN here, since we don't |
| * need anything else ever for inotify. However, let's have |
| * this API to keep our options open should we later on need |
| * it. */ |
| return POLLIN; |
| } |
| |
| int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *ret_usec) { |
| assert_return(m, -EINVAL); |
| assert_return(ret_usec, -EINVAL); |
| |
| /* For now we will only return UINT64_MAX, since we don't |
| * need any timeout. However, let's have this API to keep our |
| * options open should we later on need it. */ |
| *ret_usec = UINT64_MAX; |
| return 0; |
| } |
