src/reply-password/reply-password.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <sys/socket.h>
  24 #include <sys/un.h>
  25
  26 #include "fd-util.h"
  27 #include "log.h"
  28 #include "macro.h"
  29 #include "string-util.h"
  30 #include "util.h"
  31
  32 static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
  33         union {
  34                 struct sockaddr sa;
  35                 struct sockaddr_un un;
  36         } sa = {
  37                 .un.sun_family = AF_UNIX,
  38         };
  39
  40         assert(fd >= 0);
  41         assert(socket_name);
  42         assert(packet);
  43
  44         strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
  45
  46         if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(socket_name)) < 0)
  47                 return log_error_errno(errno, "Failed to send: %m");
  48
  49         return 0;
  50 }
  51
  52 int main(int argc, char *argv[]) {
  53         _cleanup_close_ int fd = -1;
  54         char packet[LINE_MAX];
  55         size_t length;
  56         int r;
  57
  58         log_set_target(LOG_TARGET_AUTO);
  59         log_parse_environment();
  60         log_open();
  61
  62         if (argc != 3) {
  63                 log_error("Wrong number of arguments.");
  64                 return EXIT_FAILURE;
  65         }
  66
  67         if (streq(argv[1], "1")) {
  68
  69                 packet[0] = '+';
  70                 if (!fgets(packet+1, sizeof(packet)-1, stdin)) {
  71                         r = log_error_errno(errno, "Failed to read password: %m");
  72                         goto finish;
  73                 }
  74
  75                 truncate_nl(packet+1);
  76                 length = 1 + strlen(packet+1) + 1;
  77         } else if (streq(argv[1], "0")) {
  78                 packet[0] = '-';
  79                 length = 1;
  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         memory_erase(packet, sizeof(packet));
  96
  97         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  98 }