| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2011 Lennart Poettering |
| Copyright 2014 Tom Gundersen |
| |
| 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 <string.h> |
| #include <errno.h> |
| #include <sys/inotify.h> |
| #include <poll.h> |
| |
| #include "util.h" |
| #include "macro.h" |
| #include "strv.h" |
| #include "fileio.h" |
| #include "sd-network.h" |
| |
| _public_ int sd_network_get_operational_state(char **state) { |
| _cleanup_free_ char *s = NULL; |
| int r; |
| |
| assert_return(state, -EINVAL); |
| |
| r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *state = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| 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("/run/systemd/netif/state", NEWLINE, key, &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) { |
| *ret = NULL; |
| return 0; |
| } |
| |
| a = strv_split(s, " "); |
| if (!a) |
| return -ENOMEM; |
| |
| strv_uniq(a); |
| r = strv_length(a); |
| |
| *ret = a; |
| a = NULL; |
| |
| return r; |
| } |
| |
| _public_ int sd_network_get_dns(char ***ret) { |
| return network_get_strv("DNS", ret); |
| } |
| |
| _public_ int sd_network_get_ntp(char ***ret) { |
| return network_get_strv("NTP", ret); |
| } |
| |
| _public_ int sd_network_get_domains(char ***ret) { |
| return network_get_strv("DOMAINS", ret); |
| } |
| |
| _public_ int sd_network_link_get_setup_state(int ifindex, char **state) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(state, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *state = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_link_get_network_file(int ifindex, char **filename) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(filename, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "NETWORK_FILE", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *filename = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_link_get_operational_state(int ifindex, char **state) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(state, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *state = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(llmnr, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "LLMNR", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| *llmnr = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_link_get_lldp(int ifindex, char **lldp) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| size_t size; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(lldp, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/lldp/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = read_full_file(p, &s, &size); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (size <= 0) |
| return -ENODATA; |
| |
| *lldp = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| |
| static int network_get_link_strv(const char *key, int ifindex, char ***ret) { |
| _cleanup_free_ char *p = NULL, *s = NULL; |
| _cleanup_strv_free_ char **a = NULL; |
| int r; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, key, &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) { |
| *ret = NULL; |
| return 0; |
| } |
| |
| a = strv_split(s, " "); |
| if (!a) |
| return -ENOMEM; |
| |
| strv_uniq(a); |
| r = strv_length(a); |
| |
| *ret = a; |
| a = NULL; |
| |
| return r; |
| } |
| |
| _public_ int sd_network_link_get_dns(int ifindex, char ***ret) { |
| return network_get_link_strv("DNS", ifindex, ret); |
| } |
| |
| _public_ int sd_network_link_get_ntp(int ifindex, char ***ret) { |
| return network_get_link_strv("NTP", ifindex, ret); |
| } |
| |
| _public_ int sd_network_link_get_domains(int ifindex, char ***ret) { |
| return network_get_link_strv("DOMAINS", ifindex, ret); |
| } |
| |
| _public_ int sd_network_link_get_carrier_bound_to(int ifindex, char ***ret) { |
| return network_get_link_strv("CARRIER_BOUND_TO", ifindex, ret); |
| } |
| |
| _public_ int sd_network_link_get_carrier_bound_by(int ifindex, char ***ret) { |
| return network_get_link_strv("CARRIER_BOUND_BY", ifindex, ret); |
| } |
| |
| _public_ int sd_network_link_get_wildcard_domain(int ifindex) { |
| int r; |
| _cleanup_free_ char *p = NULL, *s = NULL; |
| |
| assert_return(ifindex > 0, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "WILDCARD_DOMAIN", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| if (r < 0) |
| return r; |
| if (isempty(s)) |
| return -ENODATA; |
| |
| return parse_boolean(s); |
| } |
| |
| static inline int MONITOR_TO_FD(sd_network_monitor *m) { |
| return (int) (unsigned long) m - 1; |
| } |
| |
| static inline 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 k; |
| |
| k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); |
| if (k >= 0) |
| return 0; |
| else if (errno != ENOENT) |
| return -errno; |
| |
| k = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR); |
| if (k >= 0) |
| return 0; |
| else if (errno != ENOENT) |
| return -errno; |
| |
| k = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR); |
| if (k < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| _public_ 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(fd); |
| fd = -1; |
| |
| return 0; |
| } |
| |
| _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { |
| int fd; |
| |
| if (m) { |
| fd = MONITOR_TO_FD(m); |
| close_nointr(fd); |
| } |
| |
| return NULL; |
| } |
| |
| _public_ int sd_network_monitor_flush(sd_network_monitor *m) { |
| union inotify_event_buffer buffer; |
| struct inotify_event *e; |
| ssize_t l; |
| int fd, k; |
| |
| assert_return(m, -EINVAL); |
| |
| fd = MONITOR_TO_FD(m); |
| |
| l = read(fd, &buffer, sizeof(buffer)); |
| if (l < 0) { |
| if (errno == EAGAIN || errno == EINTR) |
| return 0; |
| |
| return -errno; |
| } |
| |
| FOREACH_INOTIFY_EVENT(e, buffer, l) { |
| if (e->mask & IN_ISDIR) { |
| k = monitor_add_inotify_watch(fd); |
| if (k < 0) |
| return k; |
| |
| k = inotify_rm_watch(fd, e->wd); |
| if (k < 0) |
| return -errno; |
| } |
| } |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { |
| |
| assert_return(m, -EINVAL); |
| |
| return MONITOR_TO_FD(m); |
| } |
| |
| _public_ 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; |
| } |
| |
| _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { |
| |
| assert_return(m, -EINVAL); |
| assert_return(timeout_usec, -EINVAL); |
| |
| /* For now we will only return (uint64_t) -1, since we don't |
| * need any timeout. However, let's have this API to keep our |
| * options open should we later on need it. */ |
| *timeout_usec = (uint64_t) -1; |
| return 0; |
| } |