diff options
Diffstat (limited to '')
| -rw-r--r-- | src/libsystemd/sd-network/sd-network.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/src/libsystemd/sd-network/sd-network.c b/src/libsystemd/sd-network/sd-network.c new file mode 100644 index 0000000..3d6b07f --- /dev/null +++ b/src/libsystemd/sd-network/sd-network.c @@ -0,0 +1,440 @@ +/* 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" +#include "util.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_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 = -1; + 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; +} |