tests/test-dhcp-client.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include "dhcp-client.h"
  19 #include <arpa/inet.h>
  20 #include <getopt.h>
  21 #include <stdlib.h>
  22 #include <limits.h>
  23 #include "command-line.h"
  24 #include "dhcp.h"
  25 #include "fatal-signal.h"
  26 #include "poll-loop.h"
  27 #include "util.h"
  28 #include "vlog.h"
  29
  30 /* --request-ip: IP address to request from server.  If zero, then do not
  31  * request a specific IP address. */
  32 static struct in_addr request_ip;
  33
  34 /* --vendor-class: Vendor class string to include in request.  If null, no
  35  * vendor class string is included. */
  36 static const char *vendor_class;
  37
  38 /* --no-resolv-conf: Update /etc/resolv.conf to match DHCP reply? */
  39 static bool update_resolv_conf = true;
  40
  41 static void parse_options(int argc, char *argv[]);
  42 static void usage(void);
  43 static void release(void *cli_);
  44 static void modify_dhcp_request(struct dhcp_msg *, void *aux);
  45
  46 int
  47 main(int argc, char *argv[])
  48 {
  49     struct dhclient *cli;
  50     int error;
  51
  52     set_program_name(argv[0]);
  53     parse_options(argc, argv);
  54
  55     argc -= optind;
  56     argv += optind;
  57     if (argc != 1) {
  58         ovs_fatal(0, "exactly one non-option argument required; "
  59                   "use --help for help");
  60     }
  61
  62     error = dhclient_create(argv[0], modify_dhcp_request, NULL, NULL, &cli);
  63     if (error) {
  64         ovs_fatal(error, "dhclient_create failed");
  65     }
  66     dhclient_init(cli, request_ip.s_addr);
  67     fatal_signal_add_hook(release, NULL, cli, true);
  68
  69     for (;;) {
  70         dhclient_run(cli);
  71         if (dhclient_changed(cli)) {
  72             dhclient_configure_netdev(cli);
  73             if (update_resolv_conf) {
  74                 dhclient_update_resolv_conf(cli);
  75             }
  76         }
  77         dhclient_wait(cli);
  78         poll_block();
  79     }
  80 }
  81
  82 static void
  83 release(void *cli_)
  84 {
  85     struct dhclient *cli = cli_;
  86     dhclient_release(cli);
  87     if (dhclient_changed(cli)) {
  88         dhclient_configure_netdev(cli);
  89     }
  90 }
  91
  92 static void
  93 modify_dhcp_request(struct dhcp_msg *msg, void *aux OVS_UNUSED)
  94 {
  95     if (vendor_class) {
  96         dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, vendor_class);
  97     }
  98 }
  99
 100 static void
 101 parse_options(int argc, char *argv[])
 102 {
 103     enum {
 104         OPT_REQUEST_IP = UCHAR_MAX + 1,
 105         OPT_VENDOR_CLASS,
 106         OPT_NO_RESOLV_CONF
 107     };
 108     static struct option long_options[] = {
 109         {"request-ip",  required_argument, 0, OPT_REQUEST_IP },
 110         {"vendor-class", required_argument, 0, OPT_VENDOR_CLASS },
 111         {"no-resolv-conf", no_argument, 0, OPT_NO_RESOLV_CONF},
 112         {"verbose",     optional_argument, 0, 'v'},
 113         {"help",        no_argument, 0, 'h'},
 114         {"version",     no_argument, 0, 'V'},
 115         {0, 0, 0, 0},
 116     };
 117     char *short_options = long_options_to_short_options(long_options);
 118
 119     for (;;) {
 120         int c;
 121
 122         c = getopt_long(argc, argv, short_options, long_options, NULL);
 123         if (c == -1) {
 124             break;
 125         }
 126
 127         switch (c) {
 128         case OPT_REQUEST_IP:
 129             if (!inet_aton(optarg, &request_ip)) {
 130                 ovs_fatal(0,
 131                           "--request-ip argument is not a valid IP address");
 132             }
 133             break;
 134
 135         case OPT_VENDOR_CLASS:
 136             vendor_class = optarg;
 137             break;
 138
 139         case OPT_NO_RESOLV_CONF:
 140             update_resolv_conf = false;
 141             break;
 142
 143         case 'h':
 144             usage();
 145
 146         case 'V':
 147             printf("%s %s compiled "__DATE__" "__TIME__"\n",
 148                    program_name, VERSION BUILDNR);
 149             exit(EXIT_SUCCESS);
 150
 151         case 'v':
 152             vlog_set_verbosity(optarg);
 153             break;
 154
 155         case '?':
 156             exit(EXIT_FAILURE);
 157
 158         default:
 159             abort();
 160         }
 161     }
 162     free(short_options);
 163 }
 164
 165 static void
 166 usage(void)
 167 {
 168     printf("%s: standalone program for testing Open vSwitch DHCP client.\n"
 169            "usage: %s [OPTIONS] NETDEV\n"
 170            "where NETDEV is a network device (e.g. eth0).\n"
 171            "\nDHCP options:\n"
 172            "  --request-ip=IP         request specified IP address (default:\n"
 173            "                          do not request a specific IP)\n"
 174            "  --vendor-class=STRING   use STRING as vendor class; use\n"
 175            "                          OpenFlow to imitate ovs-openflowd\n"
 176            "  --no-resolv-conf        do not update /etc/resolv.conf\n",
 177            program_name, program_name);
 178     vlog_usage();
 179     printf("\nOther options:\n"
 180            "  -h, --help              display this help message\n"
 181            "  -V, --version           display version information\n");
 182     exit(EXIT_SUCCESS);
 183 }
 184