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