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