active: rework make_socket_fd() to be based on socket_address_listen()

Among other things this makes sure we set SO_REUSEADDR which is
immensely useful.

6 files changed, 86 insertions, 89 deletions

diff --git a/Makefile.am b/Makefile.am
index afae87a97c..d0366c96d3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2859,6 +2859,7 @@ systemd_activate_SOURCES = \
 	src/activate/activate.c
 
 systemd_activate_LDADD = \
+	libsystemd-label.la \
 	libsystemd-shared.la \
 	libsystemd-daemon.la
 
diff --git a/src/activate/activate.c b/src/activate/activate.c
index 738cd83c52..cf8c5cebdb 100644
--- a/src/activate/activate.c
+++ b/src/activate/activate.c
@@ -91,6 +91,35 @@ static int print_socket(const char* desc, int fd) {
         return 0;
 }
 
+static int make_socket_fd(const char* address, int flags) {
+        _cleanup_free_ char *p = NULL;
+        SocketAddress a;
+        int fd, r;
+
+        r = socket_address_parse(&a, address);
+        if (r < 0) {
+                log_error("Failed to parse socket: %s", strerror(-r));
+                return r;
+        }
+
+        fd = socket_address_listen(&a, flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT, NULL, false, false, 0755, 0644, NULL);
+        if (fd < 0) {
+                log_error("Failed to listen: %s", strerror(-r));
+                return fd;
+        }
+
+        r = socket_address_print(&a, &p);
+        if (r < 0) {
+                log_error("socket_address_print(): %s", strerror(-r));
+                close_nointr_nofail(fd);
+                return r;
+        }
+
+        log_info("Listening on %s", p);
+
+        return fd;
+}
+
 static int open_sockets(int *epoll_fd, bool accept) {
         int n, fd, r;
         int count = 0;
@@ -129,6 +158,7 @@ static int open_sockets(int *epoll_fd, bool accept) {
                         return fd;
                 }
 
+                assert(fd == SD_LISTEN_FDS_START + count);
                 count ++;
         }
 
diff --git a/src/core/socket.c b/src/core/socket.c
index 887ea00fb2..03b8f927bb 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -993,46 +993,51 @@ static int socket_open_fds(Socket *s) {
                                 know_label = true;
                         }
 
-                        if ((r = socket_address_listen(
-                                             &p->address,
-                                             s->backlog,
-                                             s->bind_ipv6_only,
-                                             s->bind_to_device,
-                                             s->free_bind,
-                                             s->transparent,
-                                             s->directory_mode,
-                                             s->socket_mode,
-                                             label,
-                                             &p->fd)) < 0)
+                        r = socket_address_listen(
+                                        &p->address,
+                                        SOCK_CLOEXEC|SOCK_NONBLOCK,
+                                        s->backlog,
+                                        s->bind_ipv6_only,
+                                        s->bind_to_device,
+                                        s->free_bind,
+                                        s->transparent,
+                                        s->directory_mode,
+                                        s->socket_mode,
+                                        label);
+                        if (r < 0)
                                 goto rollback;
 
+                        p->fd = r;
                         socket_apply_socket_options(s, p->fd);
 
                 } else  if (p->type == SOCKET_SPECIAL) {
 
-                        if ((r = special_address_create(
-                                             p->path,
-                                             &p->fd)) < 0)
+                        r = special_address_create(
+                                        p->path,
+                                        &p->fd);
+                        if (r < 0)
                                 goto rollback;
 
                 } else  if (p->type == SOCKET_FIFO) {
 
-                        if ((r = fifo_address_create(
-                                             p->path,
-                                             s->directory_mode,
-                                             s->socket_mode,
-                                             &p->fd)) < 0)
+                        r = fifo_address_create(
+                                        p->path,
+                                        s->directory_mode,
+                                        s->socket_mode,
+                                        &p->fd);
+                        if (r < 0)
                                 goto rollback;
 
                         socket_apply_fifo_options(s, p->fd);
                 } else if (p->type == SOCKET_MQUEUE) {
 
-                        if ((r = mq_address_create(
-                                             p->path,
-                                             s->socket_mode,
-                                             s->mq_maxmsg,
-                                             s->mq_msgsize,
-                                             &p->fd)) < 0)
+                        r = mq_address_create(
+                                        p->path,
+                                        s->socket_mode,
+                                        s->mq_maxmsg,
+                                        s->mq_msgsize,
+                                        &p->fd);
+                        if (r < 0)
                                 goto rollback;
                 } else
                         assert_not_reached("Unknown port type");
diff --git a/src/shared/socket-label.c b/src/shared/socket-label.c
index ff212de825..c8be17a1d5 100644
--- a/src/shared/socket-label.c
+++ b/src/shared/socket-label.c
@@ -41,6 +41,7 @@
 
 int socket_address_listen(
                 const SocketAddress *a,
+                int flags,
                 int backlog,
                 SocketAddressBindIPv6Only only,
                 const char *bind_to_device,
@@ -48,27 +49,31 @@ int socket_address_listen(
                 bool transparent,
                 mode_t directory_mode,
                 mode_t socket_mode,
-                const char *label,
-                int *ret) {
+                const char *label) {
+
+        _cleanup_close_ int fd = -1;
+        int r, one;
 
-        int r, fd, one;
         assert(a);
-        assert(ret);
 
-        if ((r = socket_address_verify(a)) < 0)
+        r = socket_address_verify(a);
+        if (r < 0)
                 return r;
 
         if (socket_address_family(a) == AF_INET6 && !socket_ipv6_is_supported())
                 return -EAFNOSUPPORT;
 
-        r = label_socket_set(label);
-        if (r < 0)
-                return r;
+        if (label) {
+                r = label_socket_set(label);
+                if (r < 0)
+                        return r;
+        }
 
-        fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, a->protocol);
+        fd = socket(socket_address_family(a), a->type | flags, a->protocol);
         r = fd < 0 ? -errno : 0;
 
-        label_socket_clear();
+        if (label)
+                label_socket_clear();
 
         if (r < 0)
                 return r;
@@ -77,13 +82,13 @@ int socket_address_listen(
                 int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
 
                 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
-                        goto fail;
+                        return -errno;
         }
 
         if (socket_address_family(a) == AF_INET || socket_address_family(a) == AF_INET6) {
                 if (bind_to_device)
                         if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
-                                goto fail;
+                                return -errno;
 
                 if (free_bind) {
                         one = 1;
@@ -100,7 +105,7 @@ int socket_address_listen(
 
         one = 1;
         if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
-                goto fail;
+                return -errno;
 
         if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
                 mode_t old_mask;
@@ -108,7 +113,7 @@ int socket_address_listen(
                 /* Create parents */
                 mkdir_parents_label(a->sockaddr.un.sun_path, directory_mode);
 
-                /* Enforce the right access mode for the socket*/
+                /* Enforce the right access mode for the socket */
                 old_mask = umask(~ socket_mode);
 
                 /* Include the original umask in our mask */
@@ -127,17 +132,14 @@ int socket_address_listen(
                 r = bind(fd, &a->sockaddr.sa, a->size);
 
         if (r < 0)
-                goto fail;
+                return -errno;
 
         if (socket_address_can_accept(a))
                 if (listen(fd, backlog) < 0)
-                        goto fail;
+                        return -errno;
 
-        *ret = fd;
-        return 0;
+        r = fd;
+        fd = -1;
 
-fail:
-        r = -errno;
-        close_nointr_nofail(fd);
         return r;
 }
diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
index 954686f974..1175795d7c 100644
--- a/src/shared/socket-util.c
+++ b/src/shared/socket-util.c
@@ -568,45 +568,6 @@ bool socket_address_matches_fd(const SocketAddress *a, int fd) {
         return false;
 }
 
-int make_socket_fd(const char* address, int flags) {
-        SocketAddress a;
-        int fd, r;
-        _cleanup_free_ char *p = NULL;
-
-        r = socket_address_parse(&a, address);
-        if (r < 0) {
-                log_error("failed to parse socket: %s", strerror(-r));
-                return r;
-        }
-
-        fd = socket(socket_address_family(&a), flags, 0);
-        if (fd < 0) {
-                log_error("socket(): %m");
-                return -errno;
-        }
-
-        r = socket_address_print(&a, &p);
-        if (r < 0) {
-                log_error("socket_address_print(): %s", strerror(-r));
-                return r;
-        }
-        log_info("Listening on %s", p);
-
-        r = bind(fd, &a.sockaddr.sa, a.size);
-        if (r < 0) {
-                log_error("bind to %s: %m", address);
-                return -errno;
-        }
-
-        r = listen(fd, SOMAXCONN);
-        if (r < 0) {
-                log_error("listen on %s: %m", address);
-                return -errno;
-        }
-
-        return fd;
-}
-
 static const char* const netlink_family_table[] = {
         [NETLINK_ROUTE] = "route",
         [NETLINK_FIREWALL] = "firewall",
diff --git a/src/shared/socket-util.h b/src/shared/socket-util.h
index e0b85adf9f..0b9bf2fefc 100644
--- a/src/shared/socket-util.h
+++ b/src/shared/socket-util.h
@@ -73,6 +73,7 @@ bool socket_address_can_accept(const SocketAddress *a) _pure_;
 
 int socket_address_listen(
                 const SocketAddress *a,
+                int flags,
                 int backlog,
                 SocketAddressBindIPv6Only only,
                 const char *bind_to_device,
@@ -80,16 +81,13 @@ int socket_address_listen(
                 bool transparent,
                 mode_t directory_mode,
                 mode_t socket_mode,
-                const char *label,
-                int *ret);
+                const char *label);
 
 bool socket_address_is(const SocketAddress *a, const char *s, int type);
 bool socket_address_is_netlink(const SocketAddress *a, const char *s);
 
 bool socket_address_matches_fd(const SocketAddress *a, int fd);
 
-int make_socket_fd(const char* address, int flags);
-
 bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) _pure_;
 
 const char* socket_address_get_path(const SocketAddress *a);