scripts/libppp-plugin.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2011  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <pppd/pppd.h>
  33 #include <pppd/fsm.h>
  34 #include <pppd/ipcp.h>
  35 #include <netinet/in.h>
  36 #include <arpa/inet.h>
  37
  38 #include <dbus/dbus.h>
  39
  40 #define INET_ADDRES_LEN (INET_ADDRSTRLEN + 5)
  41 #define INET_DNS_LEN    (2*INET_ADDRSTRLEN + 9)
  42
  43 static char *busname;
  44 static char *interface;
  45 static char *path;
  46
  47 static DBusConnection *connection;
  48
  49 char pppd_version[] = VERSION;
  50
  51 int plugin_init(void);
  52
  53 static void append(DBusMessageIter *dict, const char *key, const char *value)
  54 {
  55         DBusMessageIter entry;
  56
  57         /* We clean the environment before invoking pppd, but
  58          * might as well still filter out the few things that get
  59          * added that we're not interested in
  60          */
  61         if (!strcmp(key, "PWD") || !strcmp(key, "_") ||
  62                         !strcmp(key, "SHLVL") ||
  63                         !strcmp(key, "connman_busname") ||
  64                         !strcmp(key, "connman_network"))
  65                 return;
  66
  67         dbus_message_iter_open_container(dict, DBUS_TYPE_DICT_ENTRY,
  68                                                         NULL, &entry);
  69
  70         dbus_message_iter_append_basic(&entry, DBUS_TYPE_STRING, &key);
  71
  72         dbus_message_iter_append_basic(&entry, DBUS_TYPE_STRING, &value);
  73
  74         dbus_message_iter_close_container(dict, &entry);
  75 }
  76
  77
  78 static int ppp_have_secret()
  79 {
  80         return 1;
  81 }
  82
  83 static int ppp_get_secret(char *username, char *password)
  84 {
  85         DBusMessage *msg, *reply;
  86         const char *user, *pass;
  87         DBusError err;
  88
  89         if (username == NULL && password == NULL)
  90                 return -1;
  91
  92         if (password == NULL)
  93                 return 1;
  94
  95         if (connection == NULL)
  96                 return -1;
  97
  98         dbus_error_init(&err);
  99
 100         msg = dbus_message_new_method_call(busname, path, interface, "getsec");
 101         if (msg == NULL)
 102                 return -1;
 103
 104         dbus_message_append_args(msg, DBUS_TYPE_INVALID, DBUS_TYPE_INVALID);
 105
 106         reply = dbus_connection_send_with_reply_and_block(connection,
 107                                                                 msg, -1, &err);
 108         if (reply == NULL) {
 109                 if (dbus_error_is_set(&err) == TRUE)
 110                         dbus_error_free(&err);
 111
 112                 dbus_message_unref(msg);
 113                 return -1;
 114         }
 115
 116         dbus_message_unref(msg);
 117
 118         dbus_error_init(&err);
 119
 120         if (dbus_message_get_args(reply, &err, DBUS_TYPE_STRING, &user,
 121                                                 DBUS_TYPE_STRING, &pass,
 122                                                 DBUS_TYPE_INVALID) == FALSE) {
 123                 if (dbus_error_is_set(&err) == TRUE)
 124                         dbus_error_free(&err);
 125
 126                 dbus_message_unref(reply);
 127                 return -1;
 128         }
 129
 130         if (username != NULL)
 131                 strcpy(username, user);
 132
 133         strcpy(password, pass);
 134
 135         dbus_message_unref(reply);
 136
 137         return 1;
 138 }
 139
 140 static void ppp_up(void *data, int arg)
 141 {
 142         char buf[INET_ADDRES_LEN];
 143         char dns[INET_DNS_LEN];
 144         const char *reason = "connect";
 145         bool add_blank = FALSE;
 146         DBusMessageIter iter, dict;
 147         DBusMessage *msg;
 148
 149         if (connection == NULL)
 150                 return;
 151
 152         if (ipcp_gotoptions[0].ouraddr == 0)
 153                 return;
 154
 155         msg = dbus_message_new_method_call(busname, path,
 156                                                 interface, "notify");
 157         if (msg == NULL)
 158                 return;
 159
 160         dbus_message_set_no_reply(msg, TRUE);
 161
 162         dbus_message_append_args(msg,
 163                         DBUS_TYPE_STRING, &reason, DBUS_TYPE_INVALID);
 164
 165         dbus_message_iter_init_append(msg, &iter);
 166
 167         dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY,
 168                         DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
 169                         DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_STRING_AS_STRING
 170                         DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
 171
 172         append(&dict, "INTERNAL_IFNAME", ifname);
 173
 174         inet_ntop(AF_INET, &ipcp_gotoptions[0].ouraddr, buf, INET_ADDRSTRLEN);
 175         append(&dict, "INTERNAL_IP4_ADDRESS", buf);
 176
 177         strcpy(buf, "255.255.255.255");
 178         append(&dict, "INTERNAL_IP4_NETMASK", buf);
 179
 180         if (ipcp_gotoptions[0].dnsaddr[0] || ipcp_gotoptions[0].dnsaddr[1]) {
 181                 memset(dns, 0, sizeof(dns));
 182                 dns[0] = '\0';
 183
 184                 if (ipcp_gotoptions[0].dnsaddr[0]) {
 185                         inet_ntop(AF_INET, &ipcp_gotoptions[0].dnsaddr[0],
 186                                                         buf, INET_ADDRSTRLEN);
 187                         strcat(dns, buf);
 188
 189                         add_blank = TRUE;
 190                 }
 191
 192                 if (ipcp_gotoptions[0].dnsaddr[1]) {
 193                         inet_ntop(AF_INET, &ipcp_gotoptions[0].dnsaddr[1],
 194                                                         buf, INET_ADDRSTRLEN);
 195                         if (add_blank == TRUE)
 196                                 strcat(dns, " ");
 197
 198                         strcat(dns, buf);
 199                 }
 200                 append(&dict, "INTERNAL_IP4_DNS", dns);
 201         }
 202
 203         append(&dict, "MTU", "1400");
 204
 205         dbus_message_iter_close_container(&iter, &dict);
 206
 207         dbus_connection_send(connection, msg, NULL);
 208
 209         dbus_connection_flush(connection);
 210
 211         dbus_message_unref(msg);
 212 }
 213
 214 static void ppp_exit(void *data, int arg)
 215 {
 216         if (connection != NULL) {
 217                 dbus_connection_unref(connection);
 218                 connection = NULL;
 219         }
 220
 221         if (busname != NULL) {
 222                 free(busname);
 223                 busname = NULL;
 224         }
 225
 226         if (interface != NULL) {
 227                 free(interface);
 228                 interface = NULL;
 229         }
 230
 231         if (path != NULL) {
 232                 free(path);
 233                 path = NULL;
 234         }
 235 }
 236
 237 static void ppp_phase_change(void *data, int arg)
 238 {
 239         const char *reason = "disconnect";
 240         DBusMessage *msg;
 241
 242         if (connection == NULL)
 243                 return;
 244
 245         if (arg == PHASE_DEAD || arg == PHASE_DISCONNECT) {
 246                 msg = dbus_message_new_method_call(busname, path,
 247                                                 interface, "notify");
 248                 if (msg == NULL)
 249                         return;
 250
 251                 dbus_message_set_no_reply(msg, TRUE);
 252
 253                 dbus_message_append_args(msg,
 254                         DBUS_TYPE_STRING, &reason, DBUS_TYPE_INVALID);
 255
 256                 dbus_connection_send(connection, msg, NULL);
 257
 258                 dbus_connection_flush(connection);
 259
 260                 dbus_message_unref(msg);
 261         }
 262 }
 263
 264 int plugin_init(void)
 265 {
 266         DBusError error;
 267         static const char *bus, *inter, *p;
 268
 269         dbus_error_init(&error);
 270
 271         bus = getenv("CONNMAN_BUSNAME");
 272         inter = getenv("CONNMAN_INTERFACE");
 273         p = getenv("CONNMAN_PATH");
 274
 275         if (bus == NULL || inter == NULL || p == NULL)
 276                 return -1;
 277
 278         busname = strdup(bus);
 279         interface = strdup(inter);
 280         path = strdup(p);
 281
 282         if (busname == NULL || interface == NULL || path == NULL) {
 283                 ppp_exit(NULL, 0);
 284                 return -1;
 285         }
 286
 287         connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
 288         if (connection == NULL) {
 289                 if (dbus_error_is_set(&error) == TRUE)
 290                         dbus_error_free(&error);
 291
 292                 ppp_exit(NULL, 0);
 293                 return -1;
 294         }
 295
 296         pap_passwd_hook = ppp_get_secret;
 297         chap_passwd_hook = ppp_get_secret;
 298
 299         chap_check_hook = ppp_have_secret;
 300         pap_check_hook = ppp_have_secret;
 301
 302         add_notifier(&ip_up_notifier, ppp_up, NULL);
 303         add_notifier(&phasechange, ppp_phase_change, NULL);
 304         add_notifier(&exitnotify, ppp_exit, connection);
 305
 306         return 0;
 307 }