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