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