src/reply-password/reply-password.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <stddef.h>
   5 #include <string.h>
   6 #include <sys/socket.h>
   7 #include <sys/un.h>
   8
   9 #include "fd-util.h"
  10 #include "log.h"
  11 #include "macro.h"
  12 #include "socket-util.h"
  13 #include "string-util.h"
  14 #include "util.h"
  15
  16 static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
  17         union sockaddr_union sa = {
  18                 .un.sun_family = AF_UNIX,
  19         };
  20
  21         assert(fd >= 0);
  22         assert(socket_name);
  23         assert(packet);
  24
  25         strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
  26
  27         if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
  28                 return log_error_errno(errno, "Failed to send: %m");
  29
  30         return 0;
  31 }
  32
  33 int main(int argc, char *argv[]) {
  34         _cleanup_close_ int fd = -1;
  35         char packet[LINE_MAX];
  36         size_t length;
  37         int r;
  38
  39         log_set_target(LOG_TARGET_AUTO);
  40         log_parse_environment();
  41         log_open();
  42
  43         if (argc != 3) {
  44                 log_error("Wrong number of arguments.");
  45                 return EXIT_FAILURE;
  46         }
  47
  48         if (streq(argv[1], "1")) {
  49
  50                 packet[0] = '+';
  51                 if (!fgets(packet+1, sizeof(packet)-1, stdin)) {
  52                         r = log_error_errno(errno, "Failed to read password: %m");
  53                         goto finish;
  54                 }
  55
  56                 truncate_nl(packet+1);
  57                 length = 1 + strlen(packet+1) + 1;
  58         } else if (streq(argv[1], "0")) {
  59                 packet[0] = '-';
  60                 length = 1;
  61         } else {
  62                 log_error("Invalid first argument %s", argv[1]);
  63                 r = -EINVAL;
  64                 goto finish;
  65         }
  66
  67         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
  68         if (fd < 0) {
  69                 r = log_error_errno(errno, "socket() failed: %m");
  70                 goto finish;
  71         }
  72
  73         r = send_on_socket(fd, argv[2], packet, length);
  74
  75 finish:
  76         explicit_bzero(packet, sizeof(packet));
  77
  78         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  79 }