src/reply-password/reply-password.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2010 Lennart Poettering
   4 ***/
   5
   6 #include <errno.h>
   7 #include <stddef.h>
   8 #include <string.h>
   9 #include <sys/socket.h>
  10 #include <sys/un.h>
  11
  12 #include "fd-util.h"
  13 #include "log.h"
  14 #include "macro.h"
  15 #include "socket-util.h"
  16 #include "string-util.h"
  17 #include "util.h"
  18
  19 static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
  20         union sockaddr_union sa = {
  21                 .un.sun_family = AF_UNIX,
  22         };
  23
  24         assert(fd >= 0);
  25         assert(socket_name);
  26         assert(packet);
  27
  28         strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
  29
  30         if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
  31                 return log_error_errno(errno, "Failed to send: %m");
  32
  33         return 0;
  34 }
  35
  36 int main(int argc, char *argv[]) {
  37         _cleanup_close_ int fd = -1;
  38         char packet[LINE_MAX];
  39         size_t length;
  40         int r;
  41
  42         log_set_target(LOG_TARGET_AUTO);
  43         log_parse_environment();
  44         log_open();
  45
  46         if (argc != 3) {
  47                 log_error("Wrong number of arguments.");
  48                 return EXIT_FAILURE;
  49         }
  50
  51         if (streq(argv[1], "1")) {
  52
  53                 packet[0] = '+';
  54                 if (!fgets(packet+1, sizeof(packet)-1, stdin)) {
  55                         r = log_error_errno(errno, "Failed to read password: %m");
  56                         goto finish;
  57                 }
  58
  59                 truncate_nl(packet+1);
  60                 length = 1 + strlen(packet+1) + 1;
  61         } else if (streq(argv[1], "0")) {
  62                 packet[0] = '-';
  63                 length = 1;
  64         } else {
  65                 log_error("Invalid first argument %s", argv[1]);
  66                 r = -EINVAL;
  67                 goto finish;
  68         }
  69
  70         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
  71         if (fd < 0) {
  72                 r = log_error_errno(errno, "socket() failed: %m");
  73                 goto finish;
  74         }
  75
  76         r = send_on_socket(fd, argv[2], packet, length);
  77
  78 finish:
  79         explicit_bzero(packet, sizeof(packet));
  80
  81         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  82 }