examples/nfsclient-bcast.c

   1 /*
   2    Copyright (C) by Ronnie Sahlberg <ronniesahlberg@gmail.com> 2011
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 /* Example program using the lowlevel raw broadcast interface.
  19  */
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #ifdef WIN32
  25 #include "win32_compat.h"
  26 #endif
  27
  28 #ifdef HAVE_POLL_H
  29 #include <poll.h>
  30 #endif
  31
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <errno.h>
  40
  41 #ifdef HAVE_SYS_TIME_H
  42 #include <sys/time.h>
  43 #endif
  44
  45 #ifdef HAVE_NET_IF_H
  46 #include <net/if.h>
  47 #endif
  48
  49 #ifdef HAVE_NETDB_H
  50 #include <netdb.h>
  51 #endif
  52
  53 #ifdef HAVE_SYS_IOCTL_H
  54 #include <sys/ioctl.h>
  55 #endif
  56
  57 #ifdef HAVE_SYS_SOCKET_H
  58 #include <sys/socket.h>
  59 #endif
  60
  61 #include "libnfs.h"
  62 #include "libnfs-raw.h"
  63 #include "libnfs-private.h"
  64 #include "libnfs-raw-mount.h"
  65 #include "libnfs-raw-portmap.h"
  66
  67 struct nfs_list_data {
  68        int status;
  69        struct nfs_server_list *srvrs;
  70 };
  71
  72 void free_nfs_srvr_list(struct nfs_server_list *srv)
  73 {
  74         while (srv != NULL) {
  75                 struct nfs_server_list *next = srv->next;
  76
  77                 free(srv->addr);
  78                 free(srv);
  79                 srv = next;
  80         }
  81 }
  82
  83 void pm_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
  84 {
  85         struct nfs_list_data *srv_data = private_data;
  86         struct sockaddr *sin;
  87         char hostdd[16];
  88         struct nfs_server_list *srvr;
  89
  90         if (status == RPC_STATUS_CANCEL) {
  91                 return;
  92         }
  93         if (status != 0) {
  94                 srv_data->status = -1;
  95                 return;
  96         }
  97
  98         sin = rpc_get_recv_sockaddr(rpc);
  99         if (sin == NULL) {
 100                 rpc_set_error(rpc, "failed to get sockaddr in CALLIT callback");
 101                 srv_data->status = -1;
 102                 return;
 103         }
 104
 105         if (getnameinfo(sin, sizeof(struct sockaddr_in), &hostdd[0], sizeof(hostdd), NULL, 0, NI_NUMERICHOST) < 0) {
 106                 rpc_set_error(rpc, "getnameinfo failed in CALLIT callback");
 107                 srv_data->status = -1;
 108                 return;
 109         }
 110
 111
 112         srvr = malloc(sizeof(struct nfs_server_list));
 113         if (srvr == NULL) {
 114                 rpc_set_error(rpc, "Malloc failed when allocating server structure");
 115                 srv_data->status = -1;
 116                 return;
 117         }
 118
 119         srvr->addr = strdup(hostdd);
 120         if (srvr->addr == NULL) {
 121                 rpc_set_error(rpc, "Strdup failed when allocating server structure");
 122                 free(srvr);
 123                 srv_data->status = -1;
 124                 return;
 125         }
 126
 127         srvr->next = srv_data->srvrs;
 128         srv_data->srvrs = srvr;
 129 }
 130
 131 int main(int argc _U_, char *argv[] _U_)
 132 {
 133         struct rpc_context *rpc;
 134         struct pollfd pfd;
 135         struct ifconf ifc;
 136         int size;
 137         struct timeval tv_start, tv_current;
 138         struct nfs_list_data data = {0, NULL};
 139         struct nfs_server_list *srvr;
 140         char *ptr;
 141
 142         rpc = rpc_init_udp_context();
 143         if (rpc == NULL) {
 144                 printf("failed to init context\n");
 145                 exit(10);
 146         }
 147
 148         if (rpc_bind_udp(rpc, "0.0.0.0", 0) < 0) {
 149                 printf("failed to bind to udp %s\n", rpc_get_error(rpc));
 150                 exit(10);
 151         }
 152
 153
 154         /* get list of all interfaces */
 155         size = sizeof(struct ifreq);
 156         ifc.ifc_buf = NULL;
 157         ifc.ifc_len = size;
 158
 159         while(ifc.ifc_len > (size - sizeof(struct ifreq))) {
 160                 size *= 2;
 161
 162                 free(ifc.ifc_buf);
 163                 ifc.ifc_len = size;
 164                 ifc.ifc_buf = malloc(size);
 165                 memset(ifc.ifc_buf, 0, size);
 166                 if (ioctl(rpc_get_fd(rpc), SIOCGIFCONF, (caddr_t)&ifc) < 0) {
 167                         printf("ioctl SIOCGIFCONF failed\n");
 168                         exit(10);
 169                 }
 170         }
 171
 172         for (ptr =(char *)ifc.ifc_buf; ptr < ((char *)ifc.ifc_buf) + ifc.ifc_len; ) {
 173                 struct ifreq *ifr;
 174                 char bcdd[16];
 175
 176                 ifr = (struct ifreq *)ptr;
 177 #ifdef HAVE_SOCKADDR_LEN
 178                 if (ifr->ifr_addr.sa_len > sizeof(struct sockaddr)) {
 179                         ptr += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
 180                 } else {
 181                         ptr += sizeof(ifr->ifr_name) + sizeof(struct sockaddr);
 182                 }
 183 #else
 184                 ptr += sizeof(struct ifreq);
 185 #endif
 186
 187                 if (ifr->ifr_addr.sa_family != AF_INET) {
 188                         continue;
 189                 }
 190                 if (ioctl(rpc_get_fd(rpc), SIOCGIFFLAGS, ifr) < 0) {
 191                         printf("ioctl DRBADDR failed\n");
 192                         exit(10);
 193                 }
 194                 if (!(ifr->ifr_flags & IFF_UP)) {
 195                         continue;
 196                 }
 197                 if (ifr->ifr_flags & IFF_LOOPBACK) {
 198                         continue;
 199                 }
 200                 if (!(ifr->ifr_flags & IFF_BROADCAST)) {
 201                         continue;
 202                 }
 203                 if (ioctl(rpc_get_fd(rpc), SIOCGIFBRDADDR, ifr) < 0) {
 204                         continue;
 205                 }
 206                 if (getnameinfo(&ifr->ifr_broadaddr, sizeof(struct sockaddr_in), &bcdd[0], sizeof(bcdd), NULL, 0, NI_NUMERICHOST) < 0) {
 207                         continue;
 208                 }
 209                 if (rpc_set_udp_destination(rpc, bcdd, 111, 1) < 0) {
 210                         printf("failed to set udp destination %s\n", rpc_get_error(rpc));
 211                         exit(10);
 212                 }
 213
 214                 if (rpc_pmap2_callit_async(rpc, MOUNT_PROGRAM, 2, 0, NULL, 0, pm_cb, &data) < 0) {
 215                         printf("Failed to set up callit function\n");
 216                         exit(10);
 217                 }
 218         }
 219         free(ifc.ifc_buf);
 220
 221         gettimeofday(&tv_start, NULL);
 222         for(;;) {
 223                 int mpt;
 224
 225                 pfd.fd = rpc_get_fd(rpc);
 226                 pfd.events = rpc_which_events(rpc);
 227
 228                 gettimeofday(&tv_current, NULL);
 229                 mpt = 1000
 230                 -    (tv_current.tv_sec *1000 + tv_current.tv_usec / 1000)
 231                 +    (tv_start.tv_sec *1000 + tv_start.tv_usec / 1000);
 232
 233                 if (poll(&pfd, 1, mpt) < 0) {
 234                         printf("Poll failed");
 235                         exit(10);
 236                 }
 237                 if (pfd.revents == 0) {
 238                         break;
 239                 }
 240
 241                 if (rpc_service(rpc, pfd.revents) < 0) {
 242                         printf("rpc_service failed with %s\n", rpc_get_error(rpc));
 243                         break;
 244                 }
 245         }
 246
 247         for (srvr=data.srvrs; srvr; srvr = srvr->next) {
 248                 printf("NFS SERVER @ %s\n", srvr->addr);
 249         }
 250         free_nfs_srvr_list(data.srvrs);
 251
 252         rpc_destroy_context(rpc);
 253         rpc=NULL;
 254         return 0;
 255 }