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-rw-r--r--ldpd/control.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/ldpd/control.c b/ldpd/control.c
new file mode 100644
index 0000000..db52d46
--- /dev/null
+++ b/ldpd/control.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: ISC
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
+ */
+
+#include <zebra.h>
+#include <sys/un.h>
+
+#include "ldpd.h"
+#include "ldpe.h"
+#include "log.h"
+#include "control.h"
+
+#define CONTROL_BACKLOG 5
+
+static void control_accept(struct event *);
+static struct ctl_conn *control_connbyfd(int);
+static struct ctl_conn *control_connbypid(pid_t);
+static void control_close(int);
+static void control_dispatch_imsg(struct event *);
+
+struct ctl_conns ctl_conns;
+
+static int control_fd;
+
+int
+control_init(char *path)
+{
+ struct sockaddr_un s_un;
+ int fd;
+ mode_t old_umask;
+
+ if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+ log_warn("%s: socket", __func__);
+ return (-1);
+ }
+ sock_set_nonblock(fd);
+
+ memset(&s_un, 0, sizeof(s_un));
+ s_un.sun_family = AF_UNIX;
+ strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path));
+
+ if (unlink(path) == -1)
+ if (errno != ENOENT) {
+ log_warn("%s: unlink %s", __func__, path);
+ close(fd);
+ return (-1);
+ }
+
+ old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
+ if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
+ log_warn("%s: bind: %s", __func__, path);
+ close(fd);
+ umask(old_umask);
+ return (-1);
+ }
+ umask(old_umask);
+
+ if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
+ log_warn("%s: chmod", __func__);
+ close(fd);
+ (void)unlink(path);
+ return (-1);
+ }
+
+ control_fd = fd;
+
+ return (0);
+}
+
+int
+control_listen(void)
+{
+ if (listen(control_fd, CONTROL_BACKLOG) == -1) {
+ log_warn("%s: listen", __func__);
+ return (-1);
+ }
+
+ return (accept_add(control_fd, control_accept, NULL));
+}
+
+void
+control_cleanup(char *path)
+{
+ accept_del(control_fd);
+ close(control_fd);
+ unlink(path);
+}
+
+/* ARGSUSED */
+static void control_accept(struct event *thread)
+{
+ int connfd;
+ socklen_t len;
+ struct sockaddr_un s_un;
+ struct ctl_conn *c;
+
+ len = sizeof(s_un);
+ if ((connfd = accept(EVENT_FD(thread), (struct sockaddr *)&s_un,
+ &len)) == -1) {
+ /*
+ * Pause accept if we are out of file descriptors, or
+ * libevent will haunt us here too.
+ */
+ if (errno == ENFILE || errno == EMFILE)
+ accept_pause();
+ else if (errno != EWOULDBLOCK && errno != EINTR && errno != ECONNABORTED)
+ log_warn("%s: accept", __func__);
+ return;
+ }
+ sock_set_nonblock(connfd);
+
+ if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
+ log_warn(__func__);
+ close(connfd);
+ return;
+ }
+
+ imsg_init(&c->iev.ibuf, connfd);
+ c->iev.handler_read = control_dispatch_imsg;
+ c->iev.ev_read = NULL;
+ event_add_read(master, c->iev.handler_read, &c->iev, c->iev.ibuf.fd,
+ &c->iev.ev_read);
+ c->iev.handler_write = ldp_write_handler;
+ c->iev.ev_write = NULL;
+
+ TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
+}
+
+static struct ctl_conn *
+control_connbyfd(int fd)
+{
+ struct ctl_conn *c;
+
+ TAILQ_FOREACH(c, &ctl_conns, entry) {
+ if (c->iev.ibuf.fd == fd)
+ break;
+ }
+
+ return (c);
+}
+
+static struct ctl_conn *
+control_connbypid(pid_t pid)
+{
+ struct ctl_conn *c;
+
+ TAILQ_FOREACH(c, &ctl_conns, entry) {
+ if (c->iev.ibuf.pid == pid)
+ break;
+ }
+
+ return (c);
+}
+
+static void
+control_close(int fd)
+{
+ struct ctl_conn *c;
+
+ if ((c = control_connbyfd(fd)) == NULL) {
+ log_warnx("%s: fd %d: not found", __func__, fd);
+ return;
+ }
+
+ msgbuf_clear(&c->iev.ibuf.w);
+ TAILQ_REMOVE(&ctl_conns, c, entry);
+
+ EVENT_OFF(c->iev.ev_read);
+ EVENT_OFF(c->iev.ev_write);
+ close(c->iev.ibuf.fd);
+ accept_unpause();
+ free(c);
+}
+
+/* ARGSUSED */
+static void control_dispatch_imsg(struct event *thread)
+{
+ int fd = EVENT_FD(thread);
+ struct ctl_conn *c;
+ struct imsg imsg;
+ ssize_t n;
+ unsigned int ifidx;
+
+ if ((c = control_connbyfd(fd)) == NULL) {
+ log_warnx("%s: fd %d: not found", __func__, fd);
+ return;
+ }
+
+ c->iev.ev_read = NULL;
+
+ if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) || n == 0) {
+ control_close(fd);
+ return;
+ }
+
+ for (;;) {
+ if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
+ control_close(fd);
+ return;
+ }
+
+ if (n == 0)
+ break;
+
+ switch (imsg.hdr.type) {
+ case IMSG_CTL_FIB_COUPLE:
+ case IMSG_CTL_FIB_DECOUPLE:
+ case IMSG_CTL_RELOAD:
+ case IMSG_CTL_KROUTE:
+ case IMSG_CTL_KROUTE_ADDR:
+ case IMSG_CTL_IFINFO:
+ /* ignore */
+ break;
+ case IMSG_CTL_SHOW_INTERFACE:
+ if (imsg.hdr.len == IMSG_HEADER_SIZE + sizeof(ifidx)) {
+ memcpy(&ifidx, imsg.data, sizeof(ifidx));
+ ldpe_iface_ctl(c, ifidx);
+ imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 0, -1, NULL, 0);
+ }
+ break;
+ case IMSG_CTL_SHOW_DISCOVERY:
+ ldpe_adj_ctl(c);
+ break;
+ case IMSG_CTL_SHOW_DISCOVERY_DTL:
+ ldpe_adj_detail_ctl(c);
+ break;
+ case IMSG_CTL_SHOW_LIB:
+ case IMSG_CTL_SHOW_L2VPN_PW:
+ case IMSG_CTL_SHOW_L2VPN_BINDING:
+ c->iev.ibuf.pid = imsg.hdr.pid;
+ ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
+ imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
+ break;
+ case IMSG_CTL_SHOW_NBR:
+ ldpe_nbr_ctl(c);
+ break;
+ case IMSG_CTL_CLEAR_NBR:
+ if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(struct ctl_nbr))
+ break;
+
+ nbr_clear_ctl(imsg.data);
+ break;
+ case IMSG_CTL_SHOW_LDP_SYNC:
+ ldpe_ldp_sync_ctl(c);
+ break;
+ case IMSG_CTL_LOG_VERBOSE:
+ /* ignore */
+ break;
+ default:
+ log_debug("%s: error handling imsg %d", __func__, imsg.hdr.type);
+ break;
+ }
+ imsg_free(&imsg);
+ }
+
+ imsg_event_add(&c->iev);
+}
+
+int
+control_imsg_relay(struct imsg *imsg)
+{
+ struct ctl_conn *c;
+
+ if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
+ return (0);
+
+ return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
+ -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
+}