2 files changed, 88 insertions, 0 deletions
diff --git a/src/reply-password/meson.build b/src/reply-password/meson.build
new file mode 100644
index 0000000..ace112c
--- /dev/null
+++ b/src/reply-password/meson.build
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+executables += [
+        libexec_template + {
+                'name' : 'systemd-reply-password',
+                'sources' : files('reply-password.c'),
+        },
+]
diff --git a/src/reply-password/reply-password.c b/src/reply-password/reply-password.c
new file mode 100644
index 0000000..ce4582a
--- /dev/null
+++ b/src/reply-password/reply-password.c
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stddef.h>
+#include <sys/un.h>
+
+#include "alloc-util.h"
+#include "main-func.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "macro.h"
+#include "memory-util.h"
+#include "socket-util.h"
+#include "string-util.h"
+
+static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
+        union sockaddr_union sa = {};
+        int salen;
+
+        assert(fd >= 0);
+        assert(socket_name);
+        assert(packet);
+
+        salen = sockaddr_un_set_path(&sa.un, socket_name);
+        if (salen < 0)
+                return log_error_errno(salen, "Specified socket path for AF_UNIX socket invalid, refusing: %s", socket_name);
+
+        if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, salen) < 0)
+                return log_error_errno(errno, "Failed to send: %m");
+
+        return 0;
+}
+
+static int run(int argc, char *argv[]) {
+        _cleanup_(erase_and_freep) char *packet = NULL;
+        _cleanup_close_ int fd = -EBADF;
+        size_t length = 0;
+        int r;
+
+        log_setup();
+
+        if (argc != 3)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Wrong number of arguments.");
+
+        if (streq(argv[1], "1")) {
+                _cleanup_(erase_and_freep) char *line = NULL;
+
+                r = read_line(stdin, LONG_LINE_MAX, &line);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to read password: %m");
+                if (r == 0)
+                        return log_error_errno(SYNTHETIC_ERRNO(EIO),
+                                               "Got EOF while reading password.");
+
+                packet = strjoin("+", line);
+                if (!packet)
+                        return log_oom();
+
+                length = 1 + strlen(line) + 1;
+
+        } else if (streq(argv[1], "0")) {
+                packet = strdup("-");
+                if (!packet)
+                        return log_oom();
+
+                length = 1;
+
+        } else
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Invalid first argument %s", argv[1]);
+
+        fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (fd < 0)
+                return log_error_errno(errno, "socket() failed: %m");
+
+        return send_on_socket(fd, argv[2], packet, length);
+}
+
+DEFINE_MAIN_FUNCTION(run);