/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2008-2011 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 . ***/ #include "sd-rtnl.h" #include "rtnl-util.h" #include "macro.h" #include "local-addresses.h" static int address_compare(const void *_a, const void *_b) { const struct local_address *a = _a, *b = _b; /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */ if (a->family == AF_INET && b->family == AF_INET6) return -1; if (a->family == AF_INET6 && b->family == AF_INET) return 1; if (a->scope < b->scope) return -1; if (a->scope > b->scope) return 1; if (a->metric < b->metric) return -1; if (a->metric > b->metric) return 1; if (a->ifindex < b->ifindex) return -1; if (a->ifindex > b->ifindex) return 1; return 0; } int local_addresses(sd_rtnl *context, int ifindex, struct local_address **ret) { _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; _cleanup_free_ struct local_address *list = NULL; size_t n_list = 0, n_allocated = 0; sd_rtnl_message *m; int r; assert(ret); if (context) rtnl = sd_rtnl_ref(context); else { r = sd_rtnl_open(&rtnl, 0); if (r < 0) return r; } r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); if (r < 0) return r; r = sd_rtnl_call(rtnl, req, 0, &reply); if (r < 0) return r; for (m = reply; m; m = sd_rtnl_message_next(m)) { struct local_address *a; unsigned char flags; uint16_t type; int ifi; r = sd_rtnl_message_get_errno(m); if (r < 0) return r; r = sd_rtnl_message_get_type(m, &type); if (r < 0) return r; if (type != RTM_NEWADDR) continue; r = sd_rtnl_message_addr_get_ifindex(m, &ifi); if (r < 0) return r; if (ifindex != 0 && ifi != ifindex) continue; r = sd_rtnl_message_addr_get_flags(m, &flags); if (r < 0) return r; if (flags & IFA_F_DEPRECATED) continue; if (!GREEDY_REALLOC0(list, n_allocated, n_list+1)) return -ENOMEM; a = list + n_list; r = sd_rtnl_message_addr_get_scope(m, &a->scope); if (r < 0) return r; if (ifindex == 0 && (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE)) continue; r = sd_rtnl_message_addr_get_family(m, &a->family); if (r < 0) return r; switch (a->family) { case AF_INET: r = sd_rtnl_message_read_in_addr(m, IFA_LOCAL, &a->address.in); if (r < 0) { r = sd_rtnl_message_read_in_addr(m, IFA_ADDRESS, &a->address.in); if (r < 0) continue; } break; case AF_INET6: r = sd_rtnl_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6); if (r < 0) { r = sd_rtnl_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6); if (r < 0) continue; } break; default: continue; } a->ifindex = ifi; n_list++; }; if (n_list > 0) qsort(list, n_list, sizeof(struct local_address), address_compare); *ret = list; list = NULL; return (int) n_list; } int local_gateways(sd_rtnl *context, int ifindex, struct local_address **ret) { _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; _cleanup_free_ struct local_address *list = NULL; sd_rtnl_message *m = NULL; size_t n_list = 0, n_allocated = 0; int r; assert(ret); if (context) rtnl = sd_rtnl_ref(context); else { r = sd_rtnl_open(&rtnl, 0); if (r < 0) return r; } r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, AF_UNSPEC, RTPROT_UNSPEC); if (r < 0) return r; r = sd_rtnl_message_request_dump(req, true); if (r < 0) return r; r = sd_rtnl_call(rtnl, req, 0, &reply); if (r < 0) return r; for (m = reply; m; m = sd_rtnl_message_next(m)) { struct local_address *a; uint16_t type; unsigned char dst_len, src_len; uint32_t ifi; r = sd_rtnl_message_get_errno(m); if (r < 0) return r; r = sd_rtnl_message_get_type(m, &type); if (r < 0) return r; if (type != RTM_NEWROUTE) continue; /* We only care for default routes */ r = sd_rtnl_message_route_get_dst_len(m, &dst_len); if (r < 0) return r; if (dst_len != 0) continue; r = sd_rtnl_message_route_get_src_len(m, &src_len); if (r < 0) return r; if (src_len != 0) continue; r = sd_rtnl_message_read_u32(m, RTA_OIF, &ifi); if (r < 0) return r; if (ifindex > 0 && (int) ifi != ifindex) continue; if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1)) return -ENOMEM; a = list + n_list; r = sd_rtnl_message_route_get_family(m, &a->family); if (r < 0) return r; switch (a->family) { case AF_INET: r = sd_rtnl_message_read_in_addr(m, RTA_GATEWAY, &a->address.in); if (r < 0) continue; break; case AF_INET6: r = sd_rtnl_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6); if (r < 0) continue; break; default: continue; } sd_rtnl_message_read_u32(m, RTA_PRIORITY, &a->metric); a->ifindex = ifi; n_list++; } if (n_list > 0) qsort(list, n_list, sizeof(struct local_address), address_compare); *ret = list; list = NULL; return (int) n_list; }