447 lines
14 KiB
C
447 lines
14 KiB
C
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/**
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* @file NCDInterfaceMonitor.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <asm/types.h>
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#include <asm/types.h>
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#include <misc/debug.h>
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#include <misc/nonblocking.h>
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#include <base/BLog.h>
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#include <ncd/extra/NCDInterfaceMonitor.h>
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#include <generated/blog_channel_NCDInterfaceMonitor.h>
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#define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
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static int send_wilddump_request (NCDInterfaceMonitor *o, int fd, uint32_t seq, int family, int type);
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static int get_attr (int type, struct rtattr *rta, int rta_len, void **out_attr, int *out_attr_len);
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static void report_error (NCDInterfaceMonitor *o);
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static int send_next_dump_request (NCDInterfaceMonitor *o);
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static void netlink_fd_handler (NCDInterfaceMonitor *o, int events);
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static void process_buffer (NCDInterfaceMonitor *o);
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static void more_job_handler (NCDInterfaceMonitor *o);
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static int send_wilddump_request (NCDInterfaceMonitor *o, int fd, uint32_t seq, int family, int type)
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{
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struct {
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struct nlmsghdr nlh;
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struct rtgenmsg g;
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} req;
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memset(&req, 0, sizeof(req));
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req.nlh.nlmsg_len = sizeof(req);
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req.nlh.nlmsg_type = type;
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req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
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req.nlh.nlmsg_pid = 0;
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req.nlh.nlmsg_seq = seq;
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req.g.rtgen_family = family;
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int res = write(fd, &req, sizeof(req));
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if (res < 0) {
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BLog(BLOG_ERROR, "write failed");
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return 0;
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}
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if (res != sizeof(req)) {
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BLog(BLOG_ERROR, "write short");
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return 0;
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}
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return 1;
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}
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static int get_attr (int type, struct rtattr *rta, int rta_len, void **out_attr, int *out_attr_len)
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{
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for (; RTA_OK(rta, rta_len); rta = RTA_NEXT(rta, rta_len)) {
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uint8_t *attr = RTA_DATA(rta);
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int attr_len = RTA_PAYLOAD(rta);
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if (rta->rta_type == type) {
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*out_attr = attr;
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*out_attr_len = attr_len;
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return 1;
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}
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}
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return 0;
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}
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static void report_error (NCDInterfaceMonitor *o)
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{
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DEBUGERROR(&o->d_err, o->handler_error(o->user))
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}
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static int send_next_dump_request (NCDInterfaceMonitor *o)
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{
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ASSERT(o->dump_queue)
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if (o->dump_queue & NCDIFMONITOR_WATCH_LINK) {
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o->dump_queue &= ~NCDIFMONITOR_WATCH_LINK;
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return send_wilddump_request(o, o->netlink_fd, o->dump_seq, 0, RTM_GETLINK);
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}
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else if (o->dump_queue & NCDIFMONITOR_WATCH_IPV4_ADDR) {
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o->dump_queue &= ~NCDIFMONITOR_WATCH_IPV4_ADDR;
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return send_wilddump_request(o, o->netlink_fd, o->dump_seq, AF_INET, RTM_GETADDR);
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}
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else if (o->dump_queue & NCDIFMONITOR_WATCH_IPV6_ADDR) {
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o->dump_queue &= ~NCDIFMONITOR_WATCH_IPV6_ADDR;
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return send_wilddump_request(o, o->netlink_fd, o->dump_seq, AF_INET6, RTM_GETADDR);
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}
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ASSERT(0)
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return 0;
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}
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void netlink_fd_handler (NCDInterfaceMonitor *o, int events)
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{
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DebugObject_Access(&o->d_obj);
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ASSERT(o->have_bfd)
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// handler fd error
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if (o->buf_left >= 0) {
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BLog(BLOG_ERROR, "file descriptor error");
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goto fail;
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}
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// read from netlink fd
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int len = read(o->netlink_fd, o->buf.buf, sizeof(o->buf));
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if (len < 0) {
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BLog(BLOG_ERROR, "read failed");
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goto fail;
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}
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// stop receiving fd events
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BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, 0);
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// set buffer
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o->buf_nh = &o->buf.nlh;
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o->buf_left = len;
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// process buffer
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process_buffer(o);
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return;
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fail:
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report_error(o);
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}
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void process_buffer (NCDInterfaceMonitor *o)
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{
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ASSERT(o->buf_left >= 0)
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ASSERT(o->have_bfd)
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int done = 0;
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for (; NLMSG_OK(o->buf_nh, o->buf_left); o->buf_nh = NLMSG_NEXT(o->buf_nh, o->buf_left)) {
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if (o->buf_nh->nlmsg_type == NLMSG_DONE) {
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done = 1;
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break;
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}
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struct nlmsghdr *buf = o->buf_nh;
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void *pl = NLMSG_DATA(buf);
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int pl_len = NLMSG_PAYLOAD(buf, 0);
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struct NCDInterfaceMonitor_event ev;
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switch (buf->nlmsg_type) {
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case RTM_NEWLINK: { // not RTM_DELLINK! who knows what these mean...
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if (pl_len < sizeof(struct ifinfomsg)) {
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BLog(BLOG_ERROR, "ifinfomsg too short");
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goto fail;
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}
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struct ifinfomsg *msg = pl;
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if (msg->ifi_index == o->ifindex && (o->watch_events & NCDIFMONITOR_WATCH_LINK)) {
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ev.event = (buf->nlmsg_type == RTM_NEWLINK && (msg->ifi_flags & IFF_RUNNING)) ? NCDIFMONITOR_EVENT_LINK_UP : NCDIFMONITOR_EVENT_LINK_DOWN;
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goto dispatch;
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}
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} break;
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case RTM_NEWADDR:
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case RTM_DELADDR: {
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if (pl_len < sizeof(struct ifaddrmsg)) {
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BLog(BLOG_ERROR, "ifaddrmsg too short");
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goto fail;
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}
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struct ifaddrmsg *msg = pl;
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void *addr;
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int addr_len;
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if (!get_attr(IFA_ADDRESS, IFA_RTA(msg), buf->nlmsg_len - NLMSG_LENGTH(sizeof(*msg)), &addr, &addr_len)) {
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break;
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}
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if (msg->ifa_index == o->ifindex && msg->ifa_family == AF_INET && (o->watch_events & NCDIFMONITOR_WATCH_IPV4_ADDR)) {
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if (addr_len != 4 || msg->ifa_prefixlen > 32) {
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BLog(BLOG_ERROR, "bad ipv4 ifaddrmsg");
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goto fail;
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}
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ev.event = (buf->nlmsg_type == RTM_NEWADDR) ? NCDIFMONITOR_EVENT_IPV4_ADDR_ADDED : NCDIFMONITOR_EVENT_IPV4_ADDR_REMOVED;
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ev.u.ipv4_addr.addr.addr = ((struct in_addr *)addr)->s_addr;
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ev.u.ipv4_addr.addr.prefix = msg->ifa_prefixlen;
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goto dispatch;
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}
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if (msg->ifa_index == o->ifindex && msg->ifa_family == AF_INET6 && (o->watch_events & NCDIFMONITOR_WATCH_IPV6_ADDR)) {
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if (addr_len != 16 || msg->ifa_prefixlen > 128) {
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BLog(BLOG_ERROR, "bad ipv6 ifaddrmsg");
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goto fail;
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}
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ev.event = (buf->nlmsg_type == RTM_NEWADDR) ? NCDIFMONITOR_EVENT_IPV6_ADDR_ADDED : NCDIFMONITOR_EVENT_IPV6_ADDR_REMOVED;
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memcpy(ev.u.ipv6_addr.addr.addr.bytes, ((struct in6_addr *)addr)->s6_addr, 16);
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ev.u.ipv6_addr.addr.prefix = msg->ifa_prefixlen;
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ev.u.ipv6_addr.addr_flags = 0;
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ev.u.ipv6_addr.scope = msg->ifa_scope;
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if (!(msg->ifa_flags & IFA_F_PERMANENT)) {
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ev.u.ipv6_addr.addr_flags |= NCDIFMONITOR_ADDR_FLAG_DYNAMIC;
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}
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goto dispatch;
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}
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} break;
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}
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continue;
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dispatch:
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// move to next message
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o->buf_nh = NLMSG_NEXT(o->buf_nh, o->buf_left);
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// schedule more job
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BPending_Set(&o->more_job);
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// dispatch event
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o->handler(o->user, ev);
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return;
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}
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if (done) {
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if (o->dump_queue) {
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// increment dump request sequence number
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o->dump_seq++;
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// send next dump request
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if (!send_next_dump_request(o)) {
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goto fail;
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}
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}
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else if (o->event_netlink_fd >= 0) {
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// stop watching dump fd
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BReactor_RemoveFileDescriptor(o->reactor, &o->bfd);
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o->have_bfd = 0;
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// close dump fd, make event fd current
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close(o->netlink_fd);
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o->netlink_fd = o->event_netlink_fd;
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o->event_netlink_fd = -1;
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// start watching event fd
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BFileDescriptor_Init(&o->bfd, o->netlink_fd, (BFileDescriptor_handler)netlink_fd_handler, o);
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if (!BReactor_AddFileDescriptor(o->reactor, &o->bfd)) {
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BLog(BLOG_ERROR, "BReactor_AddFileDescriptor failed");
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goto fail;
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}
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o->have_bfd = 1;
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}
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}
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// set no buffer
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o->buf_left = -1;
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// continue receiving fd events
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BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, BREACTOR_READ);
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return;
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fail:
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report_error(o);
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}
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void more_job_handler (NCDInterfaceMonitor *o)
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{
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DebugObject_Access(&o->d_obj);
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ASSERT(o->buf_left >= 0)
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// process buffer
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process_buffer(o);
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return;
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}
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int NCDInterfaceMonitor_Init (NCDInterfaceMonitor *o, int ifindex, int watch_events, BReactor *reactor, void *user,
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NCDInterfaceMonitor_handler handler,
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NCDInterfaceMonitor_handler_error handler_error)
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{
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ASSERT(watch_events)
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ASSERT((watch_events&~(NCDIFMONITOR_WATCH_LINK|NCDIFMONITOR_WATCH_IPV4_ADDR|NCDIFMONITOR_WATCH_IPV6_ADDR)) == 0)
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ASSERT(handler)
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ASSERT(handler_error)
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BNetwork_Assert();
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// init arguments
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o->ifindex = ifindex;
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o->watch_events = watch_events;
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o->reactor = reactor;
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o->user = user;
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o->handler = handler;
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o->handler_error = handler_error;
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// init dump netlink fd
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if ((o->netlink_fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
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BLog(BLOG_ERROR, "socket failed");
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goto fail0;
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}
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if (!badvpn_set_nonblocking(o->netlink_fd)) {
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BLog(BLOG_ERROR, "badvpn_set_nonblocking failed");
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goto fail1;
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}
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// init event netlink fd
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if ((o->event_netlink_fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
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BLog(BLOG_ERROR, "socket failed");
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goto fail1;
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}
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if (!badvpn_set_nonblocking(o->event_netlink_fd)) {
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BLog(BLOG_ERROR, "badvpn_set_nonblocking failed");
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goto fail2;
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}
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// build bind address
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struct sockaddr_nl sa;
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memset(&sa, 0, sizeof(sa));
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sa.nl_family = AF_NETLINK;
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sa.nl_groups = 0;
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if (watch_events & NCDIFMONITOR_WATCH_LINK) sa.nl_groups |= RTMGRP_LINK;
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if (watch_events & NCDIFMONITOR_WATCH_IPV4_ADDR) sa.nl_groups |= RTMGRP_IPV4_IFADDR;
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if (watch_events & NCDIFMONITOR_WATCH_IPV6_ADDR) sa.nl_groups |= RTMGRP_IPV6_IFADDR;
|
||
|
|
|
||
|
|
// bind event netlink fd
|
||
|
|
if (bind(o->event_netlink_fd, (void *)&sa, sizeof(sa)) < 0) {
|
||
|
|
BLog(BLOG_ERROR, "bind failed");
|
||
|
|
goto fail2;
|
||
|
|
}
|
||
|
|
|
||
|
|
// set dump state
|
||
|
|
o->dump_queue = watch_events;
|
||
|
|
o->dump_seq = 0;
|
||
|
|
|
||
|
|
// init BFileDescriptor
|
||
|
|
BFileDescriptor_Init(&o->bfd, o->netlink_fd, (BFileDescriptor_handler)netlink_fd_handler, o);
|
||
|
|
if (!BReactor_AddFileDescriptor(reactor, &o->bfd)) {
|
||
|
|
BLog(BLOG_ERROR, "BReactor_AddFileDescriptor failed");
|
||
|
|
goto fail2;
|
||
|
|
}
|
||
|
|
o->have_bfd = 1;
|
||
|
|
|
||
|
|
// set nothing in buffer
|
||
|
|
o->buf_left = -1;
|
||
|
|
|
||
|
|
// init more job
|
||
|
|
BPending_Init(&o->more_job, BReactor_PendingGroup(reactor), (BPending_handler)more_job_handler, o);
|
||
|
|
|
||
|
|
// send first dump request
|
||
|
|
if (!send_next_dump_request(o)) {
|
||
|
|
goto fail3;
|
||
|
|
}
|
||
|
|
|
||
|
|
// wait for reading fd
|
||
|
|
BReactor_SetFileDescriptorEvents(reactor, &o->bfd, BREACTOR_READ);
|
||
|
|
|
||
|
|
DebugError_Init(&o->d_err, BReactor_PendingGroup(reactor));
|
||
|
|
DebugObject_Init(&o->d_obj);
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
fail3:
|
||
|
|
BPending_Free(&o->more_job);
|
||
|
|
BReactor_RemoveFileDescriptor(o->reactor, &o->bfd);
|
||
|
|
fail2:
|
||
|
|
close(o->event_netlink_fd);
|
||
|
|
fail1:
|
||
|
|
close(o->netlink_fd);
|
||
|
|
fail0:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void NCDInterfaceMonitor_Free (NCDInterfaceMonitor *o)
|
||
|
|
{
|
||
|
|
DebugObject_Free(&o->d_obj);
|
||
|
|
DebugError_Free(&o->d_err);
|
||
|
|
|
||
|
|
// free more job
|
||
|
|
BPending_Free(&o->more_job);
|
||
|
|
|
||
|
|
// free BFileDescriptor
|
||
|
|
if (o->have_bfd) {
|
||
|
|
BReactor_RemoveFileDescriptor(o->reactor, &o->bfd);
|
||
|
|
}
|
||
|
|
|
||
|
|
// close event fd, in case we're still dumping
|
||
|
|
if (o->event_netlink_fd >= 0) {
|
||
|
|
close(o->event_netlink_fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
// close fd
|
||
|
|
close(o->netlink_fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
void NCDInterfaceMonitor_Pause (NCDInterfaceMonitor *o)
|
||
|
|
{
|
||
|
|
DebugObject_Access(&o->d_obj);
|
||
|
|
DebugError_AssertNoError(&o->d_err);
|
||
|
|
ASSERT(o->have_bfd)
|
||
|
|
|
||
|
|
if (o->buf_left >= 0) {
|
||
|
|
BPending_Unset(&o->more_job);
|
||
|
|
} else {
|
||
|
|
BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void NCDInterfaceMonitor_Continue (NCDInterfaceMonitor *o)
|
||
|
|
{
|
||
|
|
DebugObject_Access(&o->d_obj);
|
||
|
|
DebugError_AssertNoError(&o->d_err);
|
||
|
|
ASSERT(o->have_bfd)
|
||
|
|
|
||
|
|
if (o->buf_left >= 0) {
|
||
|
|
BPending_Set(&o->more_job);
|
||
|
|
} else {
|
||
|
|
BReactor_SetFileDescriptorEvents(o->reactor, &o->bfd, BREACTOR_READ);
|
||
|
|
}
|
||
|
|
}
|