| /*-*- 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 <unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <sys/inotify.h> |
| #include <sys/poll.h> |
| #include <net/if.h> |
| |
| #include "util.h" |
| #include "macro.h" |
| #include "strv.h" |
| #include "fileio.h" |
| #include "sd-network.h" |
| #include "network-internal.h" |
| #include "dhcp-lease-internal.h" |
| |
| static int link_get_flags(unsigned index, unsigned *flags) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert(index); |
| assert(flags); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "FLAGS", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| else if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| return safe_atou(s, flags); |
| } |
| |
| _public_ int sd_network_link_is_loopback(unsigned index) { |
| unsigned flags; |
| int r; |
| |
| r = link_get_flags(index, &flags); |
| if (r < 0) |
| return 0; |
| |
| return flags & IFF_LOOPBACK; |
| } |
| |
| _public_ int sd_network_get_link_state(unsigned index, char **state) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert_return(index, -EINVAL); |
| assert_return(state, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| else if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| if (streq(s, "unmanaged")) |
| return -EUNATCH; |
| else if (streq(s, "initializing")) |
| return -EBUSY; |
| |
| *state = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _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; |
| else if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| *state = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_get_link_operational_state(unsigned index, char **state) { |
| _cleanup_free_ char *s = NULL, *p = NULL; |
| int r; |
| |
| assert_return(index, -EINVAL); |
| assert_return(state, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL); |
| if (r == -ENOENT) |
| return -ENODATA; |
| else if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| *state = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| _public_ int sd_network_get_dhcp_lease(unsigned index, sd_dhcp_lease **ret) { |
| _cleanup_free_ char *p = NULL, *s = NULL; |
| sd_dhcp_lease *lease = NULL; |
| int r; |
| |
| assert_return(index, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL); |
| |
| if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| r = dhcp_lease_load(s, &lease); |
| if (r < 0) |
| return r; |
| |
| *ret = lease; |
| |
| return 0; |
| } |
| |
| static int network_get_in_addr(const char *key, unsigned index, struct in_addr **addr, size_t *addr_size) { |
| _cleanup_free_ char *p = NULL, *s = NULL; |
| int r; |
| |
| assert_return(index, -EINVAL); |
| assert_return(addr, -EINVAL); |
| assert_return(addr_size, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, key, &s, NULL); |
| if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| return deserialize_in_addrs(addr, addr_size, s); |
| } |
| |
| _public_ int sd_network_get_dns(unsigned index, struct in_addr **addr, size_t *addr_size) { |
| return network_get_in_addr("DNS", index, addr, addr_size); |
| } |
| |
| _public_ int sd_network_get_ntp(unsigned index, struct in_addr **addr, size_t *addr_size) { |
| return network_get_in_addr("NTP", index, addr, addr_size); |
| } |
| |
| static int network_get_in6_addr(const char *key, unsigned index, struct in6_addr **addr, size_t *addr_size) { |
| _cleanup_free_ char *p = NULL, *s = NULL; |
| int r; |
| |
| assert_return(index, -EINVAL); |
| assert_return(addr, -EINVAL); |
| assert_return(addr_size, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, key, &s, NULL); |
| if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| return deserialize_in6_addrs(addr, addr_size, s); |
| } |
| |
| _public_ int sd_network_get_dns6(unsigned index, struct in6_addr **addr, size_t *addr_size) { |
| return network_get_in6_addr("DNS", index, addr, addr_size); |
| } |
| |
| _public_ int sd_network_get_ntp6(unsigned index, struct in6_addr **addr, size_t *addr_size) { |
| return network_get_in6_addr("NTP", index, addr, addr_size); |
| } |
| |
| static int network_get_boolean(const char *key, unsigned index) { |
| _cleanup_free_ char *p = NULL, *s = NULL; |
| int r; |
| |
| assert_return(index, -EINVAL); |
| |
| if (asprintf(&p, "/run/systemd/netif/links/%u", index) < 0) |
| return -ENOMEM; |
| |
| r = parse_env_file(p, NEWLINE, key, &s, NULL); |
| if (r < 0) |
| return r; |
| else if (!s) |
| return -EIO; |
| |
| return parse_boolean(s); |
| } |
| |
| _public_ int sd_network_dhcp_use_dns(unsigned index) { |
| return network_get_boolean("DHCP_USE_DNS", index); |
| } |
| |
| _public_ int sd_network_dhcp_use_ntp(unsigned index) { |
| return network_get_boolean("DHCP_USE_NTP", index); |
| } |
| |
| _public_ int sd_network_get_ifindices(unsigned **indices) { |
| _cleanup_closedir_ DIR *d; |
| int r = 0; |
| unsigned n = 0; |
| _cleanup_free_ uid_t *l = NULL; |
| |
| d = opendir("/run/systemd/netif/links/"); |
| if (!d) |
| return -errno; |
| |
| for (;;) { |
| struct dirent *de; |
| int k; |
| unsigned index; |
| |
| errno = 0; |
| de = readdir(d); |
| if (!de && errno != 0) |
| return -errno; |
| |
| if (!de) |
| break; |
| |
| dirent_ensure_type(d, de); |
| |
| if (!dirent_is_file(de)) |
| continue; |
| |
| k = safe_atou(de->d_name, &index); |
| if (k < 0) |
| continue; |
| |
| if (indices) { |
| if ((unsigned) r >= n) { |
| unsigned *t; |
| |
| n = MAX(16, 2*r); |
| t = realloc(l, sizeof(unsigned) * n); |
| if (!t) |
| return -ENOMEM; |
| |
| l = t; |
| } |
| |
| assert((unsigned) r < n); |
| l[r++] = index; |
| } else |
| r++; |
| } |
| |
| if (indices) { |
| *indices = l; |
| l = NULL; |
| } |
| |
| return r; |
| } |
| |
| 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); |
| } |
| |
| _public_ int sd_network_monitor_new(const char *category, sd_network_monitor **m) { |
| int fd, 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 = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); |
| if (k < 0) { |
| safe_close(fd); |
| return -errno; |
| } |
| |
| good = true; |
| } |
| |
| if (!category || streq(category, "leases")) { |
| k = inotify_add_watch(fd, "/run/systemd/netif/leases/", IN_MOVED_TO|IN_DELETE); |
| if (k < 0) { |
| safe_close(fd); |
| return -errno; |
| } |
| |
| good = true; |
| } |
| |
| if (!good) { |
| close_nointr(fd); |
| return -EINVAL; |
| } |
| |
| *m = FD_TO_MONITOR(fd); |
| return 0; |
| } |
| |
| _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { |
| int fd; |
| |
| assert_return(m, NULL); |
| |
| fd = MONITOR_TO_FD(m); |
| close_nointr(fd); |
| |
| return NULL; |
| } |
| |
| _public_ int sd_network_monitor_flush(sd_network_monitor *m) { |
| |
| assert_return(m, -EINVAL); |
| |
| return flush_fd(MONITOR_TO_FD(m)); |
| } |
| |
| _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; |
| } |