324 lines
9.3 KiB
C
324 lines
9.3 KiB
C
/*
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* Copyright (c) 1995 Danny Gasparovski.
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*
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* Please read the file COPYRIGHT for the
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* terms and conditions of the copyright.
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*/
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#include "slirp.h"
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inline void
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insque(void *a, void *b)
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{
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register struct quehead *element = (struct quehead *) a;
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register struct quehead *head = (struct quehead *) b;
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element->qh_link = head->qh_link;
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head->qh_link = (struct quehead *)element;
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element->qh_rlink = (struct quehead *)head;
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((struct quehead *)(element->qh_link))->qh_rlink
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= (struct quehead *)element;
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}
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inline void
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remque(void *a)
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{
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register struct quehead *element = (struct quehead *) a;
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((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
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((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
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element->qh_rlink = NULL;
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}
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/* TODO: IPv6 */
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struct gfwd_list *
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add_guestfwd(struct gfwd_list **ex_ptr,
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SlirpWriteCb write_cb, void *opaque,
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struct in_addr addr, int port)
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{
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struct gfwd_list *f = g_new0(struct gfwd_list, 1);
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f->write_cb = write_cb;
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f->opaque = opaque;
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f->ex_fport = port;
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f->ex_addr = addr;
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f->ex_next = *ex_ptr;
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*ex_ptr = f;
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return f;
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}
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struct gfwd_list *
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add_exec(struct gfwd_list **ex_ptr, const char *cmdline,
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struct in_addr addr, int port)
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{
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struct gfwd_list *f = add_guestfwd(ex_ptr, NULL, NULL, addr, port);
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f->ex_exec = g_strdup(cmdline);
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return f;
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}
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static int
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slirp_socketpair_with_oob(int sv[2])
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{
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struct sockaddr_in addr = {
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.sin_family = AF_INET,
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.sin_port = 0,
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.sin_addr.s_addr = INADDR_ANY,
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};
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socklen_t addrlen = sizeof(addr);
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int ret, s;
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sv[1] = -1;
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s = slirp_socket(AF_INET, SOCK_STREAM, 0);
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if (s < 0 || bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
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listen(s, 1) < 0 ||
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getsockname(s, (struct sockaddr *)&addr, &addrlen) < 0) {
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goto err;
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}
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sv[1] = slirp_socket(AF_INET, SOCK_STREAM, 0);
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if (sv[1] < 0) {
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goto err;
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}
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/*
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* This connect won't block because we've already listen()ed on
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* the server end (even though we won't accept() the connection
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* until later on).
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*/
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do {
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ret = connect(sv[1], (struct sockaddr *)&addr, addrlen);
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} while (ret < 0 && errno == EINTR);
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if (ret < 0) {
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goto err;
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}
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do {
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sv[0] = accept(s, (struct sockaddr *)&addr, &addrlen);
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} while (sv[0] < 0 && errno == EINTR);
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if (sv[0] < 0) {
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goto err;
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}
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closesocket(s);
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return 0;
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err:
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g_critical("slirp_socketpair(): %s", strerror(errno));
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if (s >= 0) {
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closesocket(s);
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}
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if (sv[1] >= 0) {
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closesocket(sv[1]);
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}
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return -1;
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}
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static void
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fork_exec_child_setup(gpointer data)
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{
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#ifndef _WIN32
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setsid();
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#endif
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}
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#if !GLIB_CHECK_VERSION(2, 58, 0)
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typedef struct SlirpGSpawnFds {
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GSpawnChildSetupFunc child_setup;
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gpointer user_data;
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gint stdin_fd;
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gint stdout_fd;
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gint stderr_fd;
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} SlirpGSpawnFds;
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static inline void
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slirp_gspawn_fds_setup(gpointer user_data)
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{
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SlirpGSpawnFds *q = (SlirpGSpawnFds *)user_data;
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dup2(q->stdin_fd, 0);
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dup2(q->stdout_fd, 1);
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dup2(q->stderr_fd, 2);
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q->child_setup(q->user_data);
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}
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#endif
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static inline gboolean
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g_spawn_async_with_fds_slirp(const gchar *working_directory,
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gchar **argv,
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gchar **envp,
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GSpawnFlags flags,
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GSpawnChildSetupFunc child_setup,
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gpointer user_data,
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GPid *child_pid,
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gint stdin_fd,
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gint stdout_fd,
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gint stderr_fd,
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GError **error)
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{
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#if GLIB_CHECK_VERSION(2, 58, 0)
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return g_spawn_async_with_fds(working_directory, argv, envp, flags,
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child_setup, user_data,
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child_pid, stdin_fd, stdout_fd, stderr_fd,
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error);
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#else
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SlirpGSpawnFds setup = {
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.child_setup = child_setup,
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.user_data = user_data,
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.stdin_fd = stdin_fd,
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.stdout_fd = stdout_fd,
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.stderr_fd = stderr_fd,
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};
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return g_spawn_async(working_directory, argv, envp, flags,
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slirp_gspawn_fds_setup, &setup,
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child_pid, error);
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#endif
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}
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#define g_spawn_async_with_fds(wd, argv, env, f, c, d, p, ifd, ofd, efd, err) \
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g_spawn_async_with_fds_slirp(wd, argv, env, f, c, d, p, ifd, ofd, efd, err)
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#pragma GCC diagnostic pop
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int
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fork_exec(struct socket *so, const char *ex)
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{
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GError *err = NULL;
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char **argv;
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int opt, sp[2];
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DEBUG_CALL("fork_exec");
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DEBUG_ARG("so = %p", so);
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DEBUG_ARG("ex = %p", ex);
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if (slirp_socketpair_with_oob(sp) < 0) {
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return 0;
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}
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argv = g_strsplit(ex, " ", -1);
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g_spawn_async_with_fds(NULL /* cwd */,
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argv,
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NULL /* env */,
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G_SPAWN_SEARCH_PATH,
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fork_exec_child_setup, NULL /* data */,
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NULL /* child_pid */,
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sp[1], sp[1], sp[1],
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&err);
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g_strfreev(argv);
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if (err) {
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g_critical("fork_exec: %s", err->message);
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g_error_free(err);
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closesocket(sp[0]);
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closesocket(sp[1]);
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return 0;
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}
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so->s = sp[0];
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closesocket(sp[1]);
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slirp_socket_set_fast_reuse(so->s);
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opt = 1;
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setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
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slirp_set_nonblock(so->s);
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so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
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return 1;
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}
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char *slirp_connection_info(Slirp *slirp)
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{
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GString *str = g_string_new(NULL);
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const char * const tcpstates[] = {
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[TCPS_CLOSED] = "CLOSED",
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[TCPS_LISTEN] = "LISTEN",
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[TCPS_SYN_SENT] = "SYN_SENT",
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[TCPS_SYN_RECEIVED] = "SYN_RCVD",
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[TCPS_ESTABLISHED] = "ESTABLISHED",
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[TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
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[TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
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[TCPS_CLOSING] = "CLOSING",
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[TCPS_LAST_ACK] = "LAST_ACK",
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[TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
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[TCPS_TIME_WAIT] = "TIME_WAIT",
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};
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struct in_addr dst_addr;
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struct sockaddr_in src;
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socklen_t src_len;
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uint16_t dst_port;
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struct socket *so;
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const char *state;
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char buf[20];
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g_string_append_printf(str,
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" Protocol[State] FD Source Address Port "
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"Dest. Address Port RecvQ SendQ\n");
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/* TODO: IPv6 */
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for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
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if (so->so_state & SS_HOSTFWD) {
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state = "HOST_FORWARD";
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} else if (so->so_tcpcb) {
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state = tcpstates[so->so_tcpcb->t_state];
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} else {
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state = "NONE";
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}
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if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
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src_len = sizeof(src);
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getsockname(so->s, (struct sockaddr *)&src, &src_len);
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dst_addr = so->so_laddr;
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dst_port = so->so_lport;
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} else {
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src.sin_addr = so->so_laddr;
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src.sin_port = so->so_lport;
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dst_addr = so->so_faddr;
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dst_port = so->so_fport;
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}
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snprintf(buf, sizeof(buf), " TCP[%s]", state);
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g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
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src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
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ntohs(src.sin_port));
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g_string_append_printf(str, "%15s %5d %5d %5d\n",
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inet_ntoa(dst_addr), ntohs(dst_port),
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so->so_rcv.sb_cc, so->so_snd.sb_cc);
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}
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for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
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if (so->so_state & SS_HOSTFWD) {
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snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
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src_len = sizeof(src);
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getsockname(so->s, (struct sockaddr *)&src, &src_len);
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dst_addr = so->so_laddr;
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dst_port = so->so_lport;
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} else {
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snprintf(buf, sizeof(buf), " UDP[%d sec]",
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(so->so_expire - curtime) / 1000);
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src.sin_addr = so->so_laddr;
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src.sin_port = so->so_lport;
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dst_addr = so->so_faddr;
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dst_port = so->so_fport;
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}
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g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
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src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
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ntohs(src.sin_port));
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g_string_append_printf(str, "%15s %5d %5d %5d\n",
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inet_ntoa(dst_addr), ntohs(dst_port),
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so->so_rcv.sb_cc, so->so_snd.sb_cc);
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}
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for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
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snprintf(buf, sizeof(buf), " ICMP[%d sec]",
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(so->so_expire - curtime) / 1000);
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src.sin_addr = so->so_laddr;
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dst_addr = so->so_faddr;
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g_string_append_printf(str, "%-19s %3d %15s - ", buf, so->s,
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src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
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g_string_append_printf(str, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
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so->so_rcv.sb_cc, so->so_snd.sb_cc);
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}
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return g_string_free(str, FALSE);
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}
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