src/reply-password/reply-password.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/socket.h>
  23 #include <sys/poll.h>
  24 #include <sys/types.h>
  25 #include <assert.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <sys/un.h>
  31 #include <sys/stat.h>
  32 #include <sys/signalfd.h>
  33 #include <getopt.h>
  34 #include <stddef.h>
  35
  36 #include "log.h"
  37 #include "macro.h"
  38 #include "util.h"
  39
  40 static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
  41         union {
  42                 struct sockaddr sa;
  43                 struct sockaddr_un un;
  44         } sa = {
  45                 .un.sun_family = AF_UNIX,
  46         };
  47
  48         assert(fd >= 0);
  49         assert(socket_name);
  50         assert(packet);
  51
  52         strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
  53
  54         if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(socket_name)) < 0) {
  55                 log_error_errno(errno, "Failed to send: %m");
  56                 return -errno;
  57         }
  58
  59         return 0;
  60 }
  61
  62 int main(int argc, char *argv[]) {
  63         int fd = -1, r = EXIT_FAILURE;
  64         char packet[LINE_MAX];
  65         size_t length;
  66
  67         log_set_target(LOG_TARGET_AUTO);
  68         log_parse_environment();
  69         log_open();
  70
  71         if (argc != 3) {
  72                 log_error("Wrong number of arguments.");
  73                 goto finish;
  74         }
  75
  76         if (streq(argv[1], "1")) {
  77
  78                 packet[0] = '+';
  79                 if (!fgets(packet+1, sizeof(packet)-1, stdin)) {
  80                         log_error_errno(errno, "Failed to read password: %m");
  81                         goto finish;
  82                 }
  83
  84                 truncate_nl(packet+1);
  85                 length = 1 + strlen(packet+1) + 1;
  86         } else if (streq(argv[1], "0")) {
  87                 packet[0] = '-';
  88                 length = 1;
  89         } else {
  90                 log_error("Invalid first argument %s", argv[1]);
  91                 goto finish;
  92         }
  93
  94         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
  95         if (fd < 0) {
  96                 log_error_errno(errno, "socket() failed: %m");
  97                 goto finish;
  98         }
  99
 100         if (send_on_socket(fd, argv[2], packet, length) < 0)
 101                 goto finish;
 102
 103         r = EXIT_SUCCESS;
 104
 105 finish:
 106         safe_close(fd);
 107
 108         return r;
 109 }