diff options
Diffstat (limited to 'src/nss-myhostname/addresses.c')
| -rw-r--r-- | src/nss-myhostname/addresses.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/nss-myhostname/addresses.c b/src/nss-myhostname/addresses.c new file mode 100644 index 0000000000..d75e850494 --- /dev/null +++ b/src/nss-myhostname/addresses.c @@ -0,0 +1,149 @@ +/*-*- 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 <http://www.gnu.org/licenses/>. +***/ + +#include "sd-rtnl.h" +#include "rtnl-util.h" +#include "macro.h" +#include "addresses.h" + +static int address_compare(const void *_a, const void *_b) { + const struct address *a = _a, *b = _b; + + /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */ + + if (a->scope < b->scope) + return -1; + if (a->scope > b->scope) + return 1; + + if (a->family == AF_INET && b->family == AF_INET6) + return -1; + if (a->family == AF_INET6 && b->family == AF_INET) + return 1; + + if (a->ifindex < b->ifindex) + return -1; + if (a->ifindex > b->ifindex) + return 1; + + return 0; +} + +int acquire_addresses(struct address **_list, unsigned *_n_list) { + _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; + _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; + _cleanup_free_ struct address *list = NULL; + size_t n_list = 0, n_allocated = 0; + sd_rtnl_message *m; + int r; + + 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 address *a; + unsigned char flags; + uint16_t type; + + 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_flags(m, &flags); + if (r < 0) + return r; + + if (flags & IFA_F_DEPRECATED) + continue; + + if (!GREEDY_REALLOC(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 (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; + } + + r = sd_rtnl_message_addr_get_ifindex(m, &a->ifindex); + if (r < 0) + return r; + + n_list++; + }; + + if (n_list) + qsort(list, n_list, sizeof(struct address), address_compare); + + *_list = list; + list = NULL; + *_n_list = n_list; + + return 0; +} |