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socket: support ListeSpecial= sockets
This commit is contained in:
Lennart Poettering
parent
944d4c91e6
commit
b0a3f2bc09
14
TODO
14
TODO
@ -2,6 +2,13 @@ F15:
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* swap units that are activated by one name but shown in the kernel under another are semi-broken
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* Fix assert http://lists.freedesktop.org/archives/systemd-devel/2011-April/001910.html
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* 0595f9a1c182a84581749823ef47c5f292e545f9 is borked, freezes shutdown
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(path: after installing inotify watches, recheck file again to fix race)
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F15 External:
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* NFS, networkmanager ordering issue (PENDING)
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* NM should pull in network.target (PENDING)
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@ -9,9 +16,6 @@ F15:
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* bluetooth should be possible to disable (PENDING)
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* 0595f9a1c182a84581749823ef47c5f292e545f9 is borked, freezes shutdown
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(path: after installing inotify watches, recheck file again to fix race)
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* get writev() /dev/kmsg support into the F15 kernel
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https://lkml.org/lkml/2011/4/6/473
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patched merged into -mm
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@ -24,8 +28,6 @@ F15:
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* make anaconda write timeout=0 for encrypted devices
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* Fix assert http://lists.freedesktop.org/archives/systemd-devel/2011-April/001910.html
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Features:
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* maybe lower default timeout to 2min?
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@ -34,8 +36,6 @@ Features:
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* support wildcard expansion in ListeStream= and friends
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* Add ListenSpecial to .socket units for /proc/kmsg and similar friends?
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* avoid DefaultStandardOutput=syslog to have any effect on StandardInput=socket services
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* use pivot_root on shutdown so that we can unmount the root directory.
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@ -218,6 +218,21 @@
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directive above.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ListenSpecial=</varname></term>
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<listitem><para>Specifies a special
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file in the file system to listen
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on. This expects an absolute file
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system path as argument. Behaviour
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otherwise is very similar to the
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<varname>ListenFIFO=</varname>
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directive above. Use this to open
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character device nodes as well as
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special files in
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<filename>/proc</filename> and
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<filename>/sys</filename>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ListenNetlink=</varname></term>
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<listitem><para>Specifies a Netlink
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@ -220,6 +220,17 @@ static int config_parse_listen(
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}
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path_kill_slashes(p->path);
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} else if (streq(lvalue, "ListenSpecial")) {
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p->type = SOCKET_SPECIAL;
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if (!(p->path = strdup(rvalue))) {
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free(p);
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return -ENOMEM;
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}
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path_kill_slashes(p->path);
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} else if (streq(lvalue, "ListenNetlink")) {
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p->type = SOCKET_SOCKET;
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@ -1908,6 +1919,7 @@ static int load_from_path(Unit *u, const char *path) {
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{ "ListenSequentialPacket", config_parse_listen, 0, &u->socket, "Socket" },
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{ "ListenFIFO", config_parse_listen, 0, &u->socket, "Socket" },
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{ "ListenNetlink", config_parse_listen, 0, &u->socket, "Socket" },
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{ "ListenSpecial", config_parse_listen, 0, &u->socket, "Socket" },
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{ "BindIPv6Only", config_parse_socket_bind, 0, &u->socket, "Socket" },
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{ "Backlog", config_parse_unsigned, 0, &u->socket.backlog, "Socket" },
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{ "BindToDevice", config_parse_bindtodevice, 0, &u->socket, "Socket" },
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77
src/socket.c
77
src/socket.c
@ -249,7 +249,7 @@ static bool socket_needs_mount(Socket *s, const char *prefix) {
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if (socket_address_needs_mount(&p->address, prefix))
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return true;
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} else {
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assert(p->type == SOCKET_FIFO);
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assert(p->type == SOCKET_FIFO || p->type == SOCKET_SPECIAL);
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if (path_startswith(p->path, prefix))
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return true;
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}
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@ -482,7 +482,9 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
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fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t);
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free(k);
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} else
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} else if (p->type == SOCKET_SPECIAL)
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fprintf(f, "%sListenSpecial: %s\n", prefix, p->path);
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else
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fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
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}
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@ -687,7 +689,6 @@ static void socket_apply_fifo_options(Socket *s, int fd) {
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log_warning("F_SETPIPE_SZ: %m");
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}
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static int fifo_address_create(
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const char *path,
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mode_t directory_mode,
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@ -753,6 +754,42 @@ fail:
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return r;
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}
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static int special_address_create(
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const char *path,
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int *_fd) {
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int fd = -1, r = 0;
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struct stat st;
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assert(path);
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assert(_fd);
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if ((fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
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r = -errno;
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goto fail;
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}
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if (fstat(fd, &st) < 0) {
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r = -errno;
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goto fail;
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}
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/* Check whether this is a /proc, /sys or /dev file or char device */
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if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode)) {
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r = -EEXIST;
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goto fail;
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}
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*_fd = fd;
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return 0;
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fail:
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if (fd >= 0)
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close_nointr_nofail(fd);
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return r;
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}
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static int socket_open_fds(Socket *s) {
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SocketPort *p;
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int r;
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@ -796,6 +833,13 @@ static int socket_open_fds(Socket *s) {
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socket_apply_socket_options(s, p->fd);
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} else if (p->type == SOCKET_SPECIAL) {
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if ((r = special_address_create(
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p->path,
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&p->fd)) < 0)
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goto rollback;
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} else if (p->type == SOCKET_FIFO) {
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if ((r = fifo_address_create(
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@ -1461,7 +1505,9 @@ static int socket_serialize(Unit *u, FILE *f, FDSet *fds) {
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else
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unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t);
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free(t);
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} else {
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} else if (p->type == SOCKET_SPECIAL)
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unit_serialize_item_format(u, f, "special", "%i %s", copy, p->path);
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else {
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assert(p->type == SOCKET_FIFO);
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unit_serialize_item_format(u, f, "fifo", "%i %s", copy, p->path);
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}
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@ -1525,7 +1571,28 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
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else {
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LIST_FOREACH(port, p, s->ports)
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if (streq(p->path, value+skip))
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if (p->type == SOCKET_FIFO &&
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streq_ptr(p->path, value+skip))
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break;
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if (p) {
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if (p->fd >= 0)
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close_nointr_nofail(p->fd);
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p->fd = fdset_remove(fds, fd);
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}
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}
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} else if (streq(key, "special")) {
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int fd, skip = 0;
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SocketPort *p;
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if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd))
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log_debug("Failed to parse special value %s", value);
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else {
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LIST_FOREACH(port, p, s->ports)
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if (p->type == SOCKET_SPECIAL &&
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streq_ptr(p->path, value+skip))
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break;
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if (p) {
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@ -58,6 +58,7 @@ typedef enum SocketExecCommand {
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typedef enum SocketType {
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SOCKET_SOCKET,
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SOCKET_FIFO,
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SOCKET_SPECIAL,
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_SOCKET_FIFO_MAX,
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_SOCKET_FIFO_INVALID = -1
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} SocketType;
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