4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 #include <sys/ioctl.h>
32 #include <avahi-common/malloc.h>
39 AvahiNetlinkCallback callback;
44 const AvahiPoll *poll_api;
48 int avahi_netlink_work(AvahiNetlink *nl, int block) {
54 if ((bytes = recv(nl->fd, nl->buffer, nl->buffer_length, block ? 0 : MSG_DONTWAIT)) < 0) {
56 if (errno == EAGAIN || errno == EINTR)
59 avahi_log_error(__FILE__": recv() failed: %s", strerror(errno));
63 p = (struct nlmsghdr *) nl->buffer;
65 /* Check that this message originated from the kernel,
66 or a request from avahi itself, and not another process */
67 if ((p->nlmsg_pid != 0) && (p->nlmsg_pid != getpid())) {
73 for (; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
74 if (!NLMSG_OK(p, (size_t) bytes)) {
75 avahi_log_warn(__FILE__": packet truncated");
79 nl->callback(nl, p, nl->userdata);
85 static void socket_event(AvahiWatch *w, int fd, AVAHI_GCC_UNUSED AvahiWatchEvent event, void *userdata) {
86 AvahiNetlink *nl = userdata;
92 avahi_netlink_work(nl, 0);
95 AvahiNetlink *avahi_netlink_new(const AvahiPoll *poll_api, uint32_t groups, void (*cb) (AvahiNetlink *nl, struct nlmsghdr *n, void* userdata), void* userdata) {
97 struct sockaddr_nl addr;
98 AvahiNetlink *nl = NULL;
103 if ((fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
104 avahi_log_error(__FILE__": socket(PF_NETLINK): %s", strerror(errno));
108 memset(&addr, 0, sizeof(addr));
109 addr.nl_family = AF_NETLINK;
110 addr.nl_groups = groups;
111 addr.nl_pid = getpid();
113 if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
114 avahi_log_error(__FILE__": bind(): %s", strerror(errno));
118 if (!(nl = avahi_new(AvahiNetlink, 1))) {
119 avahi_log_error(__FILE__": avahi_new() failed.");
123 nl->poll_api = poll_api;
127 nl->userdata = userdata;
129 if (!(nl->buffer = avahi_new(uint8_t, nl->buffer_length = 64*1024))) {
130 avahi_log_error(__FILE__": avahi_new() failed.");
134 if (!(nl->watch = poll_api->watch_new(poll_api, fd, AVAHI_WATCH_IN, socket_event, nl))) {
135 avahi_log_error(__FILE__": Failed to create watch.");
147 avahi_free(nl->buffer);
154 void avahi_netlink_free(AvahiNetlink *nl) {
158 nl->poll_api->watch_free(nl->watch);
163 avahi_free(nl->buffer);
167 int avahi_netlink_send(AvahiNetlink *nl, struct nlmsghdr *m, unsigned *ret_seq) {
171 m->nlmsg_seq = nl->seq++;
172 m->nlmsg_flags |= NLM_F_ACK;
174 if (send(nl->fd, m, m->nlmsg_len, 0) < 0) {
175 avahi_log_error(__FILE__": send(): %s", strerror(errno));
180 *ret_seq = m->nlmsg_seq;