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 "socket-util.h"
  15 #include "string-util.h"
  16 #include "util.h"
  17
  18 static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
  19         union sockaddr_union sa = {};
  20         int salen;
  21
  22         assert(fd >= 0);
  23         assert(socket_name);
  24         assert(packet);
  25
  26         salen = sockaddr_un_set_path(&sa.un, socket_name);
  27         if (salen < 0)
  28                 return log_error_errno(salen, "Specified socket path for AF_UNIX socket invalid, refusing: %s", socket_name);
  29
  30         if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, salen) < 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_free_ char *packet = NULL;
  38         _cleanup_close_ int fd = -1;
  39         size_t length = 0;
  40         int r;
  41
  42         log_setup_service();
  43
  44         if (argc != 3) {
  45                 log_error("Wrong number of arguments.");
  46                 return EXIT_FAILURE;
  47         }
  48
  49         if (streq(argv[1], "1")) {
  50                 _cleanup_string_free_erase_ char *line = NULL;
  51
  52                 r = read_line(stdin, LONG_LINE_MAX, &line);
  53                 if (r < 0) {
  54                         log_error_errno(r, "Failed to read password: %m");
  55                         goto finish;
  56                 }
  57                 if (r == 0) {
  58                         log_error("Got EOF while reading password.");
  59                         r = -EIO;
  60                         goto finish;
  61                 }
  62
  63                 packet = strjoin("+", line);
  64                 if (!packet) {
  65                         r = log_oom();
  66                         goto finish;
  67                 }
  68
  69                 length = 1 + strlen(line) + 1;
  70
  71         } else if (streq(argv[1], "0")) {
  72                 packet = strdup("-");
  73                 if (!packet) {
  74                         r = log_oom();
  75                         goto finish;
  76                 }
  77
  78                 length = 1;
  79
  80         } else {
  81                 log_error("Invalid first argument %s", argv[1]);
  82                 r = -EINVAL;
  83                 goto finish;
  84         }
  85
  86         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
  87         if (fd < 0) {
  88                 r = log_error_errno(errno, "socket() failed: %m");
  89                 goto finish;
  90         }
  91
  92         r = send_on_socket(fd, argv[2], packet, length);
  93
  94 finish:
  95         explicit_bzero_safe(packet, length);
  96
  97         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  98 }