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 "alloc-util.h"
  10 #include "fd-util.h"
  11 #include "fileio.h"
  12 #include "log.h"
  13 #include "macro.h"
  14 #include "memory-util.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         int salen;
  22
  23         assert(fd >= 0);
  24         assert(socket_name);
  25         assert(packet);
  26
  27         salen = sockaddr_un_set_path(&sa.un, socket_name);
  28         if (salen < 0)
  29                 return log_error_errno(salen, "Specified socket path for AF_UNIX socket invalid, refusing: %s", socket_name);
  30
  31         if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, salen) < 0)
  32                 return log_error_errno(errno, "Failed to send: %m");
  33
  34         return 0;
  35 }
  36
  37 int main(int argc, char *argv[]) {
  38         _cleanup_free_ char *packet = NULL;
  39         _cleanup_close_ int fd = -1;
  40         size_t length = 0;
  41         int r;
  42
  43         log_setup_service();
  44
  45         if (argc != 3) {
  46                 log_error("Wrong number of arguments.");
  47                 return EXIT_FAILURE;
  48         }
  49
  50         if (streq(argv[1], "1")) {
  51                 _cleanup_string_free_erase_ char *line = NULL;
  52
  53                 r = read_line(stdin, LONG_LINE_MAX, &line);
  54                 if (r < 0) {
  55                         log_error_errno(r, "Failed to read password: %m");
  56                         goto finish;
  57                 }
  58                 if (r == 0) {
  59                         log_error("Got EOF while reading password.");
  60                         r = -EIO;
  61                         goto finish;
  62                 }
  63
  64                 packet = strjoin("+", line);
  65                 if (!packet) {
  66                         r = log_oom();
  67                         goto finish;
  68                 }
  69
  70                 length = 1 + strlen(line) + 1;
  71
  72         } else if (streq(argv[1], "0")) {
  73                 packet = strdup("-");
  74                 if (!packet) {
  75                         r = log_oom();
  76                         goto finish;
  77                 }
  78
  79                 length = 1;
  80
  81         } else {
  82                 log_error("Invalid first argument %s", argv[1]);
  83                 r = -EINVAL;
  84                 goto finish;
  85         }
  86
  87         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
  88         if (fd < 0) {
  89                 r = log_error_errno(errno, "socket() failed: %m");
  90                 goto finish;
  91         }
  92
  93         r = send_on_socket(fd, argv[2], packet, length);
  94
  95 finish:
  96         explicit_bzero_safe(packet, length);
  97
  98         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  99 }