/*-*- 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 "util.h" #include "macro.h" #include "strv.h" #include "fileio.h" #include "sd-network.h" #include "dhcp-lease-internal.h" _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/network/links/%u", index) < 0) return -ENOMEM; r = parse_env_file(p, NEWLINE, "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; *state = s; s = NULL; return 0; } _public_ int sd_network_get_dhcp_lease(unsigned index, sd_dhcp_lease **ret) { sd_dhcp_lease *lease; char *p, *s = NULL; int r; assert_return(index, -EINVAL); assert_return(ret, -EINVAL); if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) return -ENOMEM; r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL); free(p); if (r < 0) { free(s); return r; } else if (!s) return -EIO; r = dhcp_lease_load(s, &lease); if (r < 0) return r; *ret = lease; return 0; } _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/network/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, "netif")) { k = inotify_add_watch(fd, "/run/systemd/network/links/", 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; }