1 files changed, 98 insertions, 0 deletions
diff --git a/src/reply-password/reply-password.c b/src/reply-password/reply-password.c
new file mode 100644
index 0000000..ee7a0ea
--- /dev/null
+++ b/src/reply-password/reply-password.c
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "macro.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "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;
+}
+
+int main(int argc, char *argv[]) {
+        _cleanup_free_ char *packet = NULL;
+        _cleanup_close_ int fd = -1;
+        size_t length = 0;
+        int r;
+
+        log_setup_service();
+
+        if (argc != 3) {
+                log_error("Wrong number of arguments.");
+                return EXIT_FAILURE;
+        }
+
+        if (streq(argv[1], "1")) {
+                _cleanup_string_free_erase_ char *line = NULL;
+
+                r = read_line(stdin, LONG_LINE_MAX, &line);
+                if (r < 0) {
+                        log_error_errno(r, "Failed to read password: %m");
+                        goto finish;
+                }
+                if (r == 0) {
+                        log_error("Got EOF while reading password.");
+                        r = -EIO;
+                        goto finish;
+                }
+
+                packet = strjoin("+", line);
+                if (!packet) {
+                        r = log_oom();
+                        goto finish;
+                }
+
+                length = 1 + strlen(line) + 1;
+
+        } else if (streq(argv[1], "0")) {
+                packet = strdup("-");
+                if (!packet) {
+                        r = log_oom();
+                        goto finish;
+                }
+
+                length = 1;
+
+        } else {
+                log_error("Invalid first argument %s", argv[1]);
+                r = -EINVAL;
+                goto finish;
+        }
+
+        fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (fd < 0) {
+                r = log_error_errno(errno, "socket() failed: %m");
+                goto finish;
+        }
+
+        r = send_on_socket(fd, argv[2], packet, length);
+
+finish:
+        explicit_bzero_safe(packet, length);
+
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}