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
  21 #include "config.h"
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <poll.h>
  27 #include <errno.h>
  28 #include <sys/socket.h>
  29 #include <sys/ioctl.h>
  30 #include <sys/time.h>
  31 #include <net/if.h>
  32 #include <netdb.h>
  33 #include "libnfs-zdr.h"
  34 #include "libnfs.h"
  35 #include "libnfs-raw.h"
  36 #include "libnfs-private.h"
  37 #include "libnfs-raw-mount.h"
  38 #include "libnfs-raw-portmap.h"
  39
  40 struct nfs_list_data {
  41        int status;
  42        struct nfs_server_list *srvrs;
  43 };
  44
  45 void free_nfs_srvr_list(struct nfs_server_list *srv)
  46 {
  47         while (srv != NULL) {
  48                 struct nfs_server_list *next = srv->next;
  49
  50                 free(srv->addr);
  51                 free(srv);
  52                 srv = next;
  53         }
  54 }
  55
  56 void pm_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
  57 {
  58         struct nfs_list_data *srv_data = private_data;
  59         struct sockaddr *sin;
  60         char hostdd[16];
  61         struct nfs_server_list *srvr;
  62
  63         if (status == RPC_STATUS_CANCEL) {
  64                 return;
  65         }
  66         if (status != 0) {
  67                 srv_data->status = -1;
  68                 return;
  69         }
  70
  71         sin = rpc_get_recv_sockaddr(rpc);
  72         if (sin == NULL) {
  73                 rpc_set_error(rpc, "failed to get sockaddr in CALLIT callback");
  74                 srv_data->status = -1;
  75                 return;
  76         }
  77
  78         if (getnameinfo(sin, sizeof(struct sockaddr_in), &hostdd[0], sizeof(hostdd), NULL, 0, NI_NUMERICHOST) < 0) {
  79                 rpc_set_error(rpc, "getnameinfo failed in CALLIT callback");
  80                 srv_data->status = -1;
  81                 return;
  82         }
  83
  84
  85         srvr = malloc(sizeof(struct nfs_server_list));
  86         if (srvr == NULL) {
  87                 rpc_set_error(rpc, "Malloc failed when allocating server structure");
  88                 srv_data->status = -1;
  89                 return;
  90         }
  91
  92         srvr->addr = strdup(hostdd);
  93         if (srvr->addr == NULL) {
  94                 rpc_set_error(rpc, "Strdup failed when allocating server structure");
  95                 free(srvr);
  96                 srv_data->status = -1;
  97                 return;
  98         }
  99
 100         srvr->next = srv_data->srvrs;
 101         srv_data->srvrs = srvr;
 102 }
 103
 104 int main(int argc _U_, char *argv[] _U_)
 105 {
 106         struct rpc_context *rpc;
 107         struct pollfd pfd;
 108         struct ifconf ifc;
 109         int size;
 110         struct timeval tv_start, tv_current;
 111         struct nfs_list_data data = {0, NULL};
 112         struct nfs_server_list *srvr;
 113         char *ptr;
 114
 115         rpc = rpc_init_udp_context();
 116         if (rpc == NULL) {
 117                 printf("failed to init context\n");
 118                 exit(10);
 119         }
 120
 121         if (rpc_bind_udp(rpc, "0.0.0.0", 0) < 0) {
 122                 printf("failed to bind to udp %s\n", rpc_get_error(rpc));
 123                 exit(10);
 124         }
 125
 126
 127         /* get list of all interfaces */
 128         size = sizeof(struct ifreq);
 129         ifc.ifc_buf = NULL;
 130         ifc.ifc_len = size;
 131
 132         while(ifc.ifc_len > (size - sizeof(struct ifreq))) {
 133                 size *= 2;
 134
 135                 free(ifc.ifc_buf);
 136                 ifc.ifc_len = size;
 137                 ifc.ifc_buf = malloc(size);
 138                 memset(ifc.ifc_buf, 0, size);
 139                 if (ioctl(rpc_get_fd(rpc), SIOCGIFCONF, (caddr_t)&ifc) < 0) {
 140                         printf("ioctl SIOCGIFCONF failed\n");
 141                         exit(10);
 142                 }
 143         }
 144
 145         for (ptr =(char *)ifc.ifc_buf; ptr < ((char *)ifc.ifc_buf) + ifc.ifc_len; ) {
 146                 struct ifreq *ifr;
 147                 char bcdd[16];
 148
 149                 ifr = (struct ifreq *)ptr;
 150 #ifdef HAVE_SOCKADDR_LEN
 151                 if (ifr->ifr_addr.sa_len > sizeof(struct sockaddr)) {
 152                         ptr += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
 153                 } else {
 154                         ptr += sizeof(ifr->ifr_name) + sizeof(struct sockaddr);
 155                 }
 156 #else
 157                 ptr += sizeof(struct ifreq);
 158 #endif
 159
 160                 if (ifr->ifr_addr.sa_family != AF_INET) {
 161                         continue;
 162                 }
 163                 if (ioctl(rpc_get_fd(rpc), SIOCGIFFLAGS, ifr) < 0) {
 164                         printf("ioctl DRBADDR failed\n");
 165                         exit(10);
 166                 }
 167                 if (!(ifr->ifr_flags & IFF_UP)) {
 168                         continue;
 169                 }
 170                 if (ifr->ifr_flags & IFF_LOOPBACK) {
 171                         continue;
 172                 }
 173                 if (!(ifr->ifr_flags & IFF_BROADCAST)) {
 174                         continue;
 175                 }
 176                 if (ioctl(rpc_get_fd(rpc), SIOCGIFBRDADDR, ifr) < 0) {
 177                         continue;
 178                 }
 179                 if (getnameinfo(&ifr->ifr_broadaddr, sizeof(struct sockaddr_in), &bcdd[0], sizeof(bcdd), NULL, 0, NI_NUMERICHOST) < 0) {
 180                         continue;
 181                 }
 182                 if (rpc_set_udp_destination(rpc, bcdd, 111, 1) < 0) {
 183                         printf("failed to set udp destination %s\n", rpc_get_error(rpc));
 184                         exit(10);
 185                 }
 186
 187                 if (rpc_pmap_callit_async(rpc, MOUNT_PROGRAM, 2, 0, NULL, 0, pm_cb, &data) < 0) {
 188                         printf("Failed to set up callit function\n");
 189                         exit(10);
 190                 }
 191         }
 192         free(ifc.ifc_buf);
 193
 194         gettimeofday(&tv_start, NULL);
 195         for(;;) {
 196                 int mpt;
 197
 198                 pfd.fd = rpc_get_fd(rpc);
 199                 pfd.events = rpc_which_events(rpc);
 200
 201                 gettimeofday(&tv_current, NULL);
 202                 mpt = 1000
 203                 -    (tv_current.tv_sec *1000 + tv_current.tv_usec / 1000)
 204                 +    (tv_start.tv_sec *1000 + tv_start.tv_usec / 1000);
 205
 206                 if (poll(&pfd, 1, mpt) < 0) {
 207                         printf("Poll failed");
 208                         exit(10);
 209                 }
 210                 if (pfd.revents == 0) {
 211                         break;
 212                 }
 213
 214                 if (rpc_service(rpc, pfd.revents) < 0) {
 215                         printf("rpc_service failed with %s\n", rpc_get_error(rpc));
 216                         break;
 217                 }
 218         }
 219
 220         for (srvr=data.srvrs; srvr; srvr = srvr->next) {
 221                 printf("NFS SERVER @ %s\n", srvr->addr);
 222         }
 223         free_nfs_srvr_list(data.srvrs);
 224
 225         rpc_destroy_context(rpc);
 226         rpc=NULL;
 227         return 0;
 228 }