conmon: Add unix domain socket for attach
Signed-off-by: Mrunal Patel <mpatel@redhat.com>
This commit is contained in:
Mrunal Patel
parent
5c383d13d2
commit
065f12490c
3 changed files with 104 additions and 5 deletions
104
conmon/conmon.c
104
conmon/conmon.c
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@ -93,6 +93,7 @@ static inline void strv_cleanup(char ***strv)
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static bool terminal = false;
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static char *cid = NULL;
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static char *cuuid = NULL;
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static char *runtime_path = NULL;
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static char *bundle_path = NULL;
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static char *pid_file = NULL;
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@ -104,6 +105,7 @@ static GOptionEntry entries[] =
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{
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{ "terminal", 't', 0, G_OPTION_ARG_NONE, &terminal, "Terminal", NULL },
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{ "cid", 'c', 0, G_OPTION_ARG_STRING, &cid, "Container ID", NULL },
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{ "cuuid", 'u', 0, G_OPTION_ARG_STRING, &cuuid, "Container UUID", NULL },
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{ "runtime", 'r', 0, G_OPTION_ARG_STRING, &runtime_path, "Runtime path", NULL },
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{ "bundle", 'b', 0, G_OPTION_ARG_STRING, &bundle_path, "Bundle path", NULL },
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{ "pidfile", 'p', 0, G_OPTION_ARG_STRING, &pid_file, "PID file", NULL },
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@ -436,6 +438,7 @@ int main(int argc, char *argv[])
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int ret, runtime_status;
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char cwd[PATH_MAX];
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char default_pid_file[PATH_MAX];
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char attach_sock_path[PATH_MAX];
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GError *err = NULL;
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_cleanup_free_ char *contents;
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int cpid = -1;
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@ -470,6 +473,9 @@ int main(int argc, char *argv[])
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int wb;
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uint64_t oom_event;
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/* Used for attach */
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_cleanup_close_ int conn_sock = -1;
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/* Command line parameters */
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context = g_option_context_new("- conmon utility");
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g_option_context_add_main_entries(context, entries, "conmon");
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@ -481,6 +487,9 @@ int main(int argc, char *argv[])
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if (cid == NULL)
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nexit("Container ID not provided. Use --cid");
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if (!exec && cuuid == NULL)
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nexit("Container UUID not provided. Use --cuuid");
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if (runtime_path == NULL)
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nexit("Runtime path not provided. Use --runtime");
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@ -553,7 +562,7 @@ int main(int argc, char *argv[])
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csfd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
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if (csfd < 0)
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pexit("Failed to create console-socket");
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if (fchmod(csfd, 0700))
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if (fchmod(csfd, 0700))
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pexit("Failed to change console-socket permissions");
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/* XXX: This should be handled with a rename(2). */
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if (unlink(csname) < 0)
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@ -745,6 +754,50 @@ int main(int argc, char *argv[])
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cpid = atoi(contents);
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ninfo("container PID: %d", cpid);
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/* Setup endpoint for attach */
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char attach_symlink_dir_path[PATH_MAX];
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struct sockaddr_un attach_addr = {0};
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_cleanup_close_ int afd = -1;
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if (!exec) {
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attach_addr.sun_family = AF_UNIX;
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/*
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* Create a symlink so we don't exceed unix domain socket
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* path length limit.
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*/
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snprintf(attach_symlink_dir_path, PATH_MAX, "/var/run/crio/%s", cuuid);
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if (unlink(attach_symlink_dir_path) == -1 && errno != ENOENT) {
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pexit("Failed to remove existing symlink for attach socket directory");
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}
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if (symlink(bundle_path, attach_symlink_dir_path) == -1)
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pexit("Failed to create symlink for attach socket");
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snprintf(attach_sock_path, PATH_MAX, "/var/run/crio/%s/attach", cuuid);
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ninfo("attach sock path: %s", attach_sock_path);
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strncpy(attach_addr.sun_path, attach_sock_path, sizeof(attach_addr.sun_path) - 1);
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ninfo("addr{sun_family=AF_UNIX, sun_path=%s}", attach_addr.sun_path);
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/*
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* We make the socket non-blocking to avoid a race where client aborts connection
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* before the server gets a chance to call accept. In that scenario, the server
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* accept blocks till a new client connection comes in.
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*/
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afd = socket(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
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if (afd == -1)
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pexit("Failed to create attach socket");
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if (fchmod(afd, 0700))
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pexit("Failed to change attach socket permissions");
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if (bind(afd, (struct sockaddr *)&attach_addr, sizeof(struct sockaddr_un)) == -1)
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pexit("Failed to bind attach socket: %s", attach_sock_path);
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if (listen(afd, 10) == -1)
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pexit("Failed to listen on attach socket: %s", attach_sock_path);
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}
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/* Send the container pid back to parent */
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if (sync_pipe_fd > 0 && !exec) {
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len = snprintf(buf, BUF_SIZE, "{\"pid\": %d}\n", cpid);
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@ -810,6 +863,13 @@ int main(int argc, char *argv[])
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pexit("Failed to add OOM eventfd to epoll");
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}
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/* Add the attach socket to epoll */
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if (afd > 0) {
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ev.data.fd = afd;
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if (epoll_ctl(epfd, EPOLL_CTL_ADD, ev.data.fd, &ev) < 0)
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pexit("Failed to add attach socket fd to epoll");
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}
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/* Log all of the container's output. */
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while (num_stdio_fds > 0) {
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int ready = epoll_wait(epfd, evlist, MAX_EVENTS, -1);
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@ -831,10 +891,28 @@ int main(int argc, char *argv[])
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if (open("oom", O_CREAT, 0666) < 0) {
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nwarn("Failed to write oom file");
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}
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}
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else {
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nwarn("unknown pipe fd");
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goto out;
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} else if (evlist[i].data.fd == afd) {
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conn_sock = accept(afd, NULL, NULL);
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if (conn_sock == -1) {
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nwarn("Failed to accept client connection on attach socket");
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continue;
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}
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ev.events = EPOLLIN;
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ev.data.fd = conn_sock;
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if (epoll_ctl(epfd, EPOLL_CTL_ADD, ev.data.fd, &ev) == -1) {
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pexit("Failed to add client socket fd to epoll");
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}
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ninfo("Accepted connection");
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} else {
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num_read = read(masterfd, buf, BUF_SIZE);
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if (num_read <= 0)
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goto out;
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ninfo("got data on connection: %d", num_read);
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if (terminal) {
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if (write_all(masterfd_stdout, buf, num_read) < 0) {
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nwarn("Failed to write to master pty");
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}
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}
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}
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if (masterfd == masterfd_stdout || masterfd == masterfd_stderr) {
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@ -846,11 +924,21 @@ int main(int argc, char *argv[])
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nwarn("write_k8s_log failed");
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goto out;
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}
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if (conn_sock > 0) {
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if (write_all(conn_sock, buf, num_read) < 0) {
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nwarn("Failed to write to socket");
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}
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}
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}
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} else if (evlist[i].events & (EPOLLHUP | EPOLLERR)) {
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printf("closing fd %d\n", evlist[i].data.fd);
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if (close(evlist[i].data.fd) < 0)
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pexit("close");
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if (!exec && evlist[i].data.fd == conn_sock) {
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conn_sock = -1;
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continue;
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}
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num_stdio_fds--;
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}
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}
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@ -906,5 +994,11 @@ out:
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}
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}
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if (!exec) {
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if (unlink(attach_symlink_dir_path) == -1 && errno != ENOENT) {
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pexit("Failed to remove symlink for attach socket directory");
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}
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}
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return EXIT_SUCCESS;
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}
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@ -114,6 +114,7 @@ func (r *Runtime) CreateContainer(c *Container, cgroupParent string) error {
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args = append(args, "-s")
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}
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args = append(args, "-c", c.name)
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args = append(args, "-u", c.id)
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args = append(args, "-r", r.Path(c))
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args = append(args, "-b", c.bundlePath)
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args = append(args, "-p", filepath.Join(c.bundlePath, "pidfile"))
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@ -555,6 +555,10 @@ func New(config *Config) (*Server, error) {
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return nil, err
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}
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if err := os.MkdirAll("/var/run/crio", 0755); err != nil {
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return nil, err
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}
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r, err := oci.New(config.Runtime, config.RuntimeHostPrivileged, config.Conmon, config.ConmonEnv, config.CgroupManager)
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if err != nil {
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return nil, err
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