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 "def.h"
  11 #include "fd-util.h"
  12 #include "fileio.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         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;
  41         int r;
  42
  43         log_set_target(LOG_TARGET_AUTO);
  44         log_parse_environment();
  45         log_open();
  46
  47         if (argc != 3) {
  48                 log_error("Wrong number of arguments.");
  49                 return EXIT_FAILURE;
  50         }
  51
  52         if (streq(argv[1], "1")) {
  53                 _cleanup_string_free_erase_ char *line = NULL;
  54
  55                 r = read_line(stdin, LONG_LINE_MAX, &line);
  56                 if (r < 0) {
  57                         log_error_errno(r, "Failed to read password: %m");
  58                         goto finish;
  59                 }
  60                 if (r == 0) {
  61                         log_error("Got EOF while reading password.");
  62                         r = -EIO;
  63                         goto finish;
  64                 }
  65
  66                 packet = strjoin("+", line);
  67                 if (!packet) {
  68                         r = log_oom();
  69                         goto finish;
  70                 }
  71
  72                 length = 1 + strlen(line) + 1;
  73
  74         } else if (streq(argv[1], "0")) {
  75                 packet = strdup("-");
  76                 if (!packet) {
  77                         r = log_oom();
  78                         goto finish;
  79                 }
  80
  81                 length = 1;
  82
  83         } else {
  84                 log_error("Invalid first argument %s", argv[1]);
  85                 r = -EINVAL;
  86                 goto finish;
  87         }
  88
  89         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
  90         if (fd < 0) {
  91                 r = log_error_errno(errno, "socket() failed: %m");
  92                 goto finish;
  93         }
  94
  95         r = send_on_socket(fd, argv[2], packet, length);
  96
  97 finish:
  98         explicit_bzero(packet, length);
  99
 100         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 101 }