add example for sync interface to probe for all local servers

[deb_libnfs.git] / lib / libnfs-sync.c

diff --git a/lib/libnfs-sync.c b/lib/libnfs-sync.c
index 4c8ba76a5139eb2e66351498fdc992a55cda8990..6e4eff542782515ff4b4ec51ad95f1848b9a5274 100644 (file)
--- a/lib/libnfs-sync.c
+++ b/lib/libnfs-sync.c
@@ -25,10 +25,13 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <sys/ioctl.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <poll.h>
+#include <net/if.h>
+#include <netdb.h>
 #include "libnfs.h"
 #include "libnfs-raw.h"
 #include "libnfs-raw-mount.h"
@@ -1129,3 +1132,187 @@ void mount_free_export_list(struct exportnode *exports)
        }
 }
 
+
+
+
+void free_nfs_srvr_list(struct nfs_server_list *srv)
+{
+       while (srv != NULL) {
+               struct nfs_server_list *next = srv->next;
+
+               free(srv->addr);
+               free(srv);
+               srv = next;
+       }
+}           
+
+struct nfs_list_data {
+       int status;
+       struct nfs_server_list *srvrs;
+};
+
+void callit_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
+{
+       struct nfs_list_data *srv_data = private_data;
+       struct sockaddr *sin;
+       char hostdd[16];
+       struct nfs_server_list *srvr;
+
+       if (status == RPC_STATUS_CANCEL) {
+               return;
+       }
+       if (status != 0) {
+               srv_data->status = -1;
+               return;
+       }
+
+       sin = rpc_get_recv_sockaddr(rpc);
+       if (sin == NULL) {
+               rpc_set_error(rpc, "failed to get sockaddr in CALLIT callback");
+               srv_data->status = -1;
+               return;
+       }
+
+       if (getnameinfo(sin, sizeof(struct sockaddr_in), &hostdd[0], sizeof(hostdd), NULL, 0, NI_NUMERICHOST) < 0) {
+               rpc_set_error(rpc, "getnameinfo failed in CALLIT callback");
+               srv_data->status = -1;
+               return;
+       }
+
+       
+       srvr = malloc(sizeof(struct nfs_server_list));
+       if (srvr == NULL) {
+               rpc_set_error(rpc, "Malloc failed when allocating server structure");   
+               srv_data->status = -1;
+               return;
+       }
+
+       srvr->addr = strdup(hostdd);
+       if (srvr->addr == NULL) {
+               rpc_set_error(rpc, "Strdup failed when allocating server structure");
+               free(srvr);
+               srv_data->status = -1;
+               return;
+       }
+
+       srvr->next = srv_data->srvrs;
+       srv_data->srvrs = srvr;
+}
+
+struct nfs_server_list *nfs_find_local_servers(void)
+{
+       struct rpc_context *rpc;
+       struct nfs_list_data data = {0, NULL};
+       struct timeval tv_start, tv_current;
+       struct ifconf ifc;
+       int i, size;
+       struct pollfd pfd;
+
+       rpc = rpc_init_udp_context();
+       if (rpc == NULL) {
+               return NULL;
+       }
+
+       if (rpc_bind_udp(rpc, "0.0.0.0", 0) < 0) {
+               rpc_destroy_context(rpc);
+               return NULL;
+       }
+
+
+       /* get list of all interfaces */
+       size = sizeof(struct ifreq);
+       ifc.ifc_buf = NULL;
+       ifc.ifc_len = size;
+
+       while (ifc.ifc_len == size) {
+               size *= 2;
+
+               free(ifc.ifc_buf);      
+               ifc.ifc_len = size;
+               ifc.ifc_buf = malloc(size);
+               if (ioctl(rpc_get_fd(rpc), SIOCGIFCONF, (caddr_t)&ifc) < 0) {
+                       rpc_destroy_context(rpc);
+                       free(ifc.ifc_buf);      
+                       return NULL;
+               }
+       }       
+
+       for (i = 0; (unsigned)i < ifc.ifc_len / sizeof(struct ifconf); i++) {
+               char bcdd[16];
+
+               if (ifc.ifc_req[i].ifr_addr.sa_family != AF_INET) {
+                       continue;
+               }
+               if (ioctl(rpc_get_fd(rpc), SIOCGIFFLAGS, &ifc.ifc_req[i]) < 0) {
+                       rpc_destroy_context(rpc);
+                       free(ifc.ifc_buf);      
+                       return NULL;
+               }
+               if (!(ifc.ifc_req[i].ifr_flags & IFF_UP)) {
+                       continue;
+               }
+               if (ifc.ifc_req[i].ifr_flags & IFF_LOOPBACK) {
+                       continue;
+               }
+               if (!(ifc.ifc_req[i].ifr_flags & IFF_BROADCAST)) {
+                       continue;
+               }
+               if (ioctl(rpc_get_fd(rpc), SIOCGIFBRDADDR, &ifc.ifc_req[i]) < 0) {
+                       rpc_destroy_context(rpc);
+                       free(ifc.ifc_buf);      
+                       return NULL;
+               }
+               if (getnameinfo(&ifc.ifc_req[i].ifr_broadaddr, sizeof(struct sockaddr_in), &bcdd[0], sizeof(bcdd), NULL, 0, NI_NUMERICHOST) < 0) {
+                       rpc_destroy_context(rpc);
+                       free(ifc.ifc_buf);      
+                       return NULL;
+               }
+               if (rpc_set_udp_destination(rpc, bcdd, 111, 1) < 0) {
+                       rpc_destroy_context(rpc);
+                       free(ifc.ifc_buf);      
+                       return NULL;
+               }
+
+               if (rpc_pmap_callit_async(rpc, MOUNT_PROGRAM, 2, 0, NULL, 0, callit_cb, &data) < 0) {
+                       rpc_destroy_context(rpc);
+                       free(ifc.ifc_buf);      
+                       return NULL;
+               }
+       }
+       free(ifc.ifc_buf);      
+
+       gettimeofday(&tv_start, NULL);
+       for(;;) {
+               int mpt;
+
+               pfd.fd = rpc_get_fd(rpc);
+               pfd.events = rpc_which_events(rpc);
+
+               gettimeofday(&tv_current, NULL);
+               mpt = 1000
+               -    (tv_current.tv_sec *1000 + tv_current.tv_usec / 1000)
+               +    (tv_start.tv_sec *1000 + tv_start.tv_usec / 1000);
+
+               if (poll(&pfd, 1, mpt) < 0) {
+                       free_nfs_srvr_list(data.srvrs);
+                       rpc_destroy_context(rpc);
+                       return NULL;
+               }
+               if (pfd.revents == 0) {
+                       break;
+               }
+               
+               if (rpc_service(rpc, pfd.revents) < 0) {
+                       break;
+               }
+       }
+
+       rpc_destroy_context(rpc);
+
+       if (data.status != 0) {
+               free_nfs_srvr_list(data.srvrs);
+               return NULL;
+       }
+
+       return data.srvrs;
+}