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 #include <sys/time.h>
  41
  42 #ifdef HAVE_NET_IF_H
  43 #include <net/if.h>
  44 #endif
  45
  46 #ifdef HAVE_NETDB_H
  47 #include <netdb.h>
  48 #endif
  49
  50 #ifdef HAVE_SYS_IOCTL_H
  51 #include <sys/ioctl.h>
  52 #endif
  53
  54 #ifdef HAVE_SYS_SOCKET_H
  55 #include <sys/socket.h>
  56 #endif
  57
  58 #include "libnfs-zdr.h"
  59 #include "libnfs.h"
  60 #include "libnfs-raw.h"
  61 #include "libnfs-private.h"
  62 #include "libnfs-raw-mount.h"
  63 #include "libnfs-raw-portmap.h"
  64
  65 struct nfs_list_data {
  66        int status;
  67        struct nfs_server_list *srvrs;
  68 };
  69
  70 void free_nfs_srvr_list(struct nfs_server_list *srv)
  71 {
  72         while (srv != NULL) {
  73                 struct nfs_server_list *next = srv->next;
  74
  75                 free(srv->addr);
  76                 free(srv);
  77                 srv = next;
  78         }
  79 }
  80
  81 void pm_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
  82 {
  83         struct nfs_list_data *srv_data = private_data;
  84         struct sockaddr *sin;
  85         char hostdd[16];
  86         struct nfs_server_list *srvr;
  87
  88         if (status == RPC_STATUS_CANCEL) {
  89                 return;
  90         }
  91         if (status != 0) {
  92                 srv_data->status = -1;
  93                 return;
  94         }
  95
  96         sin = rpc_get_recv_sockaddr(rpc);
  97         if (sin == NULL) {
  98                 rpc_set_error(rpc, "failed to get sockaddr in CALLIT callback");
  99                 srv_data->status = -1;
 100                 return;
 101         }
 102
 103         if (getnameinfo(sin, sizeof(struct sockaddr_in), &hostdd[0], sizeof(hostdd), NULL, 0, NI_NUMERICHOST) < 0) {
 104                 rpc_set_error(rpc, "getnameinfo failed in CALLIT callback");
 105                 srv_data->status = -1;
 106                 return;
 107         }
 108
 109
 110         srvr = malloc(sizeof(struct nfs_server_list));
 111         if (srvr == NULL) {
 112                 rpc_set_error(rpc, "Malloc failed when allocating server structure");
 113                 srv_data->status = -1;
 114                 return;
 115         }
 116
 117         srvr->addr = strdup(hostdd);
 118         if (srvr->addr == NULL) {
 119                 rpc_set_error(rpc, "Strdup failed when allocating server structure");
 120                 free(srvr);
 121                 srv_data->status = -1;
 122                 return;
 123         }
 124
 125         srvr->next = srv_data->srvrs;
 126         srv_data->srvrs = srvr;
 127 }
 128
 129 int main(int argc _U_, char *argv[] _U_)
 130 {
 131         struct rpc_context *rpc;
 132         struct pollfd pfd;
 133         struct ifconf ifc;
 134         int size;
 135         struct timeval tv_start, tv_current;
 136         struct nfs_list_data data = {0, NULL};
 137         struct nfs_server_list *srvr;
 138         char *ptr;
 139
 140         rpc = rpc_init_udp_context();
 141         if (rpc == NULL) {
 142                 printf("failed to init context\n");
 143                 exit(10);
 144         }
 145
 146         if (rpc_bind_udp(rpc, "0.0.0.0", 0) < 0) {
 147                 printf("failed to bind to udp %s\n", rpc_get_error(rpc));
 148                 exit(10);
 149         }
 150
 151
 152         /* get list of all interfaces */
 153         size = sizeof(struct ifreq);
 154         ifc.ifc_buf = NULL;
 155         ifc.ifc_len = size;
 156
 157         while(ifc.ifc_len > (size - sizeof(struct ifreq))) {
 158                 size *= 2;
 159
 160                 free(ifc.ifc_buf);
 161                 ifc.ifc_len = size;
 162                 ifc.ifc_buf = malloc(size);
 163                 memset(ifc.ifc_buf, 0, size);
 164                 if (ioctl(rpc_get_fd(rpc), SIOCGIFCONF, (caddr_t)&ifc) < 0) {
 165                         printf("ioctl SIOCGIFCONF failed\n");
 166                         exit(10);
 167                 }
 168         }
 169
 170         for (ptr =(char *)ifc.ifc_buf; ptr < ((char *)ifc.ifc_buf) + ifc.ifc_len; ) {
 171                 struct ifreq *ifr;
 172                 char bcdd[16];
 173
 174                 ifr = (struct ifreq *)ptr;
 175 #ifdef HAVE_SOCKADDR_LEN
 176                 if (ifr->ifr_addr.sa_len > sizeof(struct sockaddr)) {
 177                         ptr += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
 178                 } else {
 179                         ptr += sizeof(ifr->ifr_name) + sizeof(struct sockaddr);
 180                 }
 181 #else
 182                 ptr += sizeof(struct ifreq);
 183 #endif
 184
 185                 if (ifr->ifr_addr.sa_family != AF_INET) {
 186                         continue;
 187                 }
 188                 if (ioctl(rpc_get_fd(rpc), SIOCGIFFLAGS, ifr) < 0) {
 189                         printf("ioctl DRBADDR failed\n");
 190                         exit(10);
 191                 }
 192                 if (!(ifr->ifr_flags & IFF_UP)) {
 193                         continue;
 194                 }
 195                 if (ifr->ifr_flags & IFF_LOOPBACK) {
 196                         continue;
 197                 }
 198                 if (!(ifr->ifr_flags & IFF_BROADCAST)) {
 199                         continue;
 200                 }
 201                 if (ioctl(rpc_get_fd(rpc), SIOCGIFBRDADDR, ifr) < 0) {
 202                         continue;
 203                 }
 204                 if (getnameinfo(&ifr->ifr_broadaddr, sizeof(struct sockaddr_in), &bcdd[0], sizeof(bcdd), NULL, 0, NI_NUMERICHOST) < 0) {
 205                         continue;
 206                 }
 207                 if (rpc_set_udp_destination(rpc, bcdd, 111, 1) < 0) {
 208                         printf("failed to set udp destination %s\n", rpc_get_error(rpc));
 209                         exit(10);
 210                 }
 211
 212                 if (rpc_pmap_callit_async(rpc, MOUNT_PROGRAM, 2, 0, NULL, 0, pm_cb, &data) < 0) {
 213                         printf("Failed to set up callit function\n");
 214                         exit(10);
 215                 }
 216         }
 217         free(ifc.ifc_buf);
 218
 219         gettimeofday(&tv_start, NULL);
 220         for(;;) {
 221                 int mpt;
 222
 223                 pfd.fd = rpc_get_fd(rpc);
 224                 pfd.events = rpc_which_events(rpc);
 225
 226                 gettimeofday(&tv_current, NULL);
 227                 mpt = 1000
 228                 -    (tv_current.tv_sec *1000 + tv_current.tv_usec / 1000)
 229                 +    (tv_start.tv_sec *1000 + tv_start.tv_usec / 1000);
 230
 231                 if (poll(&pfd, 1, mpt) < 0) {
 232                         printf("Poll failed");
 233                         exit(10);
 234                 }
 235                 if (pfd.revents == 0) {
 236                         break;
 237                 }
 238
 239                 if (rpc_service(rpc, pfd.revents) < 0) {
 240                         printf("rpc_service failed with %s\n", rpc_get_error(rpc));
 241                         break;
 242                 }
 243         }
 244
 245         for (srvr=data.srvrs; srvr; srvr = srvr->next) {
 246                 printf("NFS SERVER @ %s\n", srvr->addr);
 247         }
 248         free_nfs_srvr_list(data.srvrs);
 249
 250         rpc_destroy_context(rpc);
 251         rpc=NULL;
 252         return 0;
 253 }