diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-05-27 15:32:35 -0400 |
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committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-05-27 15:32:35 -0400 |
commit | 658d4fefc78a50ad825f95f55f640a2a97134f80 (patch) | |
tree | a46e63faa481178532d2ebecb53d31b00e3654ca /src/libsystemd/libsystemd-internal/sd-netlink/local-addresses.c | |
parent | 3f88c40b91e52978fdb9efcf684a6a2b62afb509 (diff) |
stuff
Diffstat (limited to 'src/libsystemd/libsystemd-internal/sd-netlink/local-addresses.c')
-rw-r--r-- | src/libsystemd/libsystemd-internal/sd-netlink/local-addresses.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/src/libsystemd/libsystemd-internal/sd-netlink/local-addresses.c b/src/libsystemd/libsystemd-internal/sd-netlink/local-addresses.c new file mode 100644 index 0000000000..e6feb859cd --- /dev/null +++ b/src/libsystemd/libsystemd-internal/sd-netlink/local-addresses.c @@ -0,0 +1,276 @@ +/*** + 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 <http://www.gnu.org/licenses/>. +***/ + +#include <systemd/sd-netlink.h> + +#include "alloc-util.h" +#include "local-addresses.h" +#include "macro.h" +#include "netlink-util.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 memcmp(&a->address, &b->address, FAMILY_ADDRESS_SIZE(a->family)); +} + +int local_addresses(sd_netlink *context, int ifindex, int af, struct local_address **ret) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; + _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; + _cleanup_free_ struct local_address *list = NULL; + size_t n_list = 0, n_allocated = 0; + sd_netlink_message *m; + int r; + + assert(ret); + + if (context) + rtnl = sd_netlink_ref(context); + else { + r = sd_netlink_open(&rtnl); + if (r < 0) + return r; + } + + r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, af); + if (r < 0) + return r; + + r = sd_netlink_call(rtnl, req, 0, &reply); + if (r < 0) + return r; + + for (m = reply; m; m = sd_netlink_message_next(m)) { + struct local_address *a; + unsigned char flags; + uint16_t type; + int ifi, family; + + r = sd_netlink_message_get_errno(m); + if (r < 0) + return r; + + r = sd_netlink_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_family(m, &family); + if (r < 0) + return r; + if (af != AF_UNSPEC && af != family) + 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; + + switch (family) { + + case AF_INET: + r = sd_netlink_message_read_in_addr(m, IFA_LOCAL, &a->address.in); + if (r < 0) { + r = sd_netlink_message_read_in_addr(m, IFA_ADDRESS, &a->address.in); + if (r < 0) + continue; + } + break; + + case AF_INET6: + r = sd_netlink_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6); + if (r < 0) { + r = sd_netlink_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6); + if (r < 0) + continue; + } + break; + + default: + continue; + } + + a->ifindex = ifi; + a->family = family; + + 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_netlink *context, int ifindex, int af, struct local_address **ret) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; + _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; + _cleanup_free_ struct local_address *list = NULL; + sd_netlink_message *m = NULL; + size_t n_list = 0, n_allocated = 0; + int r; + + assert(ret); + + if (context) + rtnl = sd_netlink_ref(context); + else { + r = sd_netlink_open(&rtnl); + if (r < 0) + return r; + } + + r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC); + if (r < 0) + return r; + + r = sd_netlink_message_request_dump(req, true); + if (r < 0) + return r; + + r = sd_netlink_call(rtnl, req, 0, &reply); + if (r < 0) + return r; + + for (m = reply; m; m = sd_netlink_message_next(m)) { + struct local_address *a; + uint16_t type; + unsigned char dst_len, src_len; + uint32_t ifi; + int family; + + r = sd_netlink_message_get_errno(m); + if (r < 0) + return r; + + r = sd_netlink_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_prefixlen(m, &dst_len); + if (r < 0) + return r; + if (dst_len != 0) + continue; + + r = sd_rtnl_message_route_get_src_prefixlen(m, &src_len); + if (r < 0) + return r; + if (src_len != 0) + continue; + + r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi); + if (r < 0) + return r; + if (ifindex > 0 && (int) ifi != ifindex) + continue; + + r = sd_rtnl_message_route_get_family(m, &family); + if (r < 0) + return r; + if (af != AF_UNSPEC && af != family) + continue; + + if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1)) + return -ENOMEM; + + a = list + n_list; + + switch (family) { + case AF_INET: + r = sd_netlink_message_read_in_addr(m, RTA_GATEWAY, &a->address.in); + if (r < 0) + continue; + + break; + case AF_INET6: + r = sd_netlink_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6); + if (r < 0) + continue; + + break; + default: + continue; + } + + sd_netlink_message_read_u32(m, RTA_PRIORITY, &a->metric); + + a->ifindex = ifi; + a->family = family; + + n_list++; + } + + if (n_list > 0) + qsort(list, n_list, sizeof(struct local_address), address_compare); + + *ret = list; + list = NULL; + + return (int) n_list; +} |