Example NFS server using libnfs
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#include <stdlib.h>
#include <string.h>
#include "nfs-service.h"
static void fill_example_rootdir_fsattr(struct fattr3 *attr)
{
struct timespec now;
clock_gettime(CLOCK_REALTIME, &now);
attr->type = NF3DIR;
attr->mode = 0755;
attr->nlink = 1;
attr->uid = 0;
attr->gid = 0;
attr->size = 4096;
attr->used = 4096;
attr->rdev = (specdata3){ 0, 0 };
attr->fsid = 1;
attr->fileid = 1;
attr->atime.seconds = now.tv_sec;
attr->atime.nseconds = now.tv_nsec;
attr->mtime = attr->atime;
attr->ctime = attr->atime;
}
static void fill_example_testfile_fsattr(struct fattr3 *attr)
{
struct timespec now;
clock_gettime(CLOCK_REALTIME, &now);
attr->type = NF3REG;
attr->mode = 0644;
attr->nlink = 1;
attr->uid = 0;
attr->gid = 0;
attr->size = strlen("Hello, world!")+1;
attr->used = strlen("Hello, world!")+1;
attr->rdev = (specdata3){ 0, 0 };
attr->fsid = 1;
attr->fileid = 2;
attr->atime.seconds = now.tv_sec;
attr->atime.nseconds = now.tv_nsec;
attr->mtime = attr->atime;
attr->ctime = attr->atime;
}
static int nfs3_null_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
rpc_send_reply(rpc, call, NULL, (zdrproc_t)zdr_void, 0);
return 0;
}
static int nfs3_getattr_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
GETATTR3args *args = call->body.cbody.args;
GETATTR3res reply;
if (args->object.data.data_len != 10)
{
// Example error
reply.status = NFS3ERR_PERM;
}
else
{
// Fill info
reply.status = NFS3_OK;
fill_example_rootdir_fsattr(&reply.GETATTR3res_u.resok.obj_attributes);
}
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_GETATTR3res, sizeof(GETATTR3res));
return 0;
}
static int nfs3_setattr_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
SETATTR3args *args = call->body.cbody.args;
SETATTR3res reply;
// Not supported yet
reply.status = NFS3ERR_NOTSUPP;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_SETATTR3res, sizeof(SETATTR3res));
return 0;
}
static int nfs3_lookup_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
LOOKUP3args *args = call->body.cbody.args;
LOOKUP3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_LOOKUP3res, sizeof(LOOKUP3res));
return 0;
}
static int nfs3_access_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
ACCESS3args *args = call->body.cbody.args;
ACCESS3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_ACCESS3res, sizeof(ACCESS3res));
return 0;
}
static int nfs3_readlink_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
READLINK3args *args = call->body.cbody.args;
READLINK3res reply;
// Not supported yet
reply.status = NFS3ERR_NOTSUPP;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_READLINK3res, sizeof(READLINK3res));
return 0;
}
static int nfs3_read_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
READ3args *args = call->body.cbody.args;
READ3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_READ3res, sizeof(READ3res));
return 0;
}
static int nfs3_write_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
WRITE3args *args = call->body.cbody.args;
WRITE3res reply;
// Not supported yet
reply.status = NFS3ERR_NOTSUPP;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_WRITE3res, sizeof(WRITE3res));
return 0;
}
static int nfs3_create_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
CREATE3args *args = call->body.cbody.args;
CREATE3res reply;
// Not supported yet
reply.status = NFS3ERR_NOTSUPP;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_CREATE3res, sizeof(CREATE3res));
return 0;
}
static int nfs3_mkdir_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
MKDIR3args *args = call->body.cbody.args;
MKDIR3res reply;
// Not supported yet
reply.status = NFS3ERR_NOTSUPP;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_MKDIR3res, sizeof(MKDIR3res));
return 0;
}
static int nfs3_symlink_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
SYMLINK3args *args = call->body.cbody.args;
SYMLINK3res reply;
// Not supported yet
reply.status = NFS3ERR_NOTSUPP;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_SYMLINK3res, sizeof(SYMLINK3res));
return 0;
}
static int nfs3_mknod_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
MKNOD3args *args = call->body.cbody.args;
MKNOD3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_MKNOD3res, sizeof(MKNOD3res));
return 0;
}
static int nfs3_remove_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
REMOVE3args *args = call->body.cbody.args;
REMOVE3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_REMOVE3res, sizeof(REMOVE3res));
return 0;
}
static int nfs3_rmdir_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
RMDIR3args *args = call->body.cbody.args;
RMDIR3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_RMDIR3res, sizeof(RMDIR3res));
return 0;
}
static int nfs3_rename_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
RENAME3args *args = call->body.cbody.args;
RENAME3res reply;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_RENAME3res, sizeof(RENAME3res));
return 0;
}
static int nfs3_link_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
LINK3args *args = call->body.cbody.args;
// We don't support hard links
LINK3res reply = { NFS3ERR_NOTSUPP };
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_LINK3res, sizeof(LINK3res));
return 0;
}
static int nfs3_readdir_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
READDIR3args *args = call->body.cbody.args;
READDIR3res reply;
// Example: return 1 entry
struct entry3 entries[1] = { {
.fileid = 2,
.name = "testfile",
.cookie = 0,
.nextentry = NULL,
} };
reply.status = NFS3_OK;
reply.READDIR3res_u.resok.dir_attributes.attributes_follow = FALSE;
*(uint64_t*)(reply.READDIR3res_u.resok.cookieverf) = 1; // continuation cookie
reply.READDIR3res_u.resok.reply.entries = entries;
reply.READDIR3res_u.resok.reply.eof = TRUE;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_READDIR3res, sizeof(READDIR3res));
return 0;
}
static int nfs3_readdirplus_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
READDIRPLUS3args *args = call->body.cbody.args;
READDIRPLUS3res reply;
// Example: return 1 entry (but this time with attributes)
struct entryplus3 entries[1] = { {
.fileid = 2,
.name = "testfile",
.cookie = 0,
.name_attributes = {
.attributes_follow = TRUE,
},
.name_handle = {
.handle_follows = FALSE,
},
.nextentry = NULL,
} };
fill_example_testfile_fsattr(&entries[0].name_attributes.post_op_attr_u.attributes);
reply.status = NFS3_OK;
reply.READDIRPLUS3res_u.resok.dir_attributes.attributes_follow = FALSE;
*(uint64_t*)(reply.READDIRPLUS3res_u.resok.cookieverf) = 1; // continuation cookie
reply.READDIRPLUS3res_u.resok.reply.entries = entries;
reply.READDIRPLUS3res_u.resok.reply.eof = TRUE;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_READDIRPLUS3res, sizeof(READDIRPLUS3res));
return 0;
}
// Get file system statistics
static int nfs3_fsstat_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
FSSTAT3args *args = call->body.cbody.args;
FSSTAT3res reply;
reply.status = NFS3_OK;
reply.FSSTAT3res_u.resok.obj_attributes.attributes_follow = TRUE;
fill_example_rootdir_fsattr(&reply.FSSTAT3res_u.resok.obj_attributes.post_op_attr_u.attributes);
reply.FSSTAT3res_u.resok.tbytes = 4096; // total bytes
reply.FSSTAT3res_u.resok.fbytes = 4096; // free bytes
reply.FSSTAT3res_u.resok.abytes = 4096; // available bytes
reply.FSSTAT3res_u.resok.tfiles = 1 << 31; // total files
reply.FSSTAT3res_u.resok.ffiles = 1 << 31; // free files
reply.FSSTAT3res_u.resok.afiles = 1 << 31; // available files
reply.FSSTAT3res_u.resok.invarsec = 0;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_FSSTAT3res, sizeof(FSSTAT3res));
return 0;
}
static int nfs3_fsinfo_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
FSINFO3args *args = call->body.cbody.args;
FSINFO3res reply;
if (args->fsroot.data.data_len != 10)
{
// Example error
reply.status = NFS3ERR_INVAL;
}
else
{
// Fill info
reply.status = NFS3_OK;
reply.FSINFO3res_u.resok.obj_attributes.attributes_follow = TRUE;
fill_example_rootdir_fsattr(&reply.FSINFO3res_u.resok.obj_attributes.post_op_attr_u.attributes);
reply.FSINFO3res_u.resok.rtmax = 128*1024*1024;
reply.FSINFO3res_u.resok.rtpref = 128*1024*1024;
reply.FSINFO3res_u.resok.rtmult = 4096;
reply.FSINFO3res_u.resok.wtmax = 128*1024*1024;
reply.FSINFO3res_u.resok.wtpref = 128*1024*1024;
reply.FSINFO3res_u.resok.wtmult = 4096;
reply.FSINFO3res_u.resok.dtpref = 128;
reply.FSINFO3res_u.resok.maxfilesize = 0x7fffffffffffffff;
reply.FSINFO3res_u.resok.time_delta.seconds = 1;
reply.FSINFO3res_u.resok.time_delta.nseconds = 0;
reply.FSINFO3res_u.resok.properties = FSF3_SYMLINK | FSF3_HOMOGENEOUS;
}
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_FSINFO3res, sizeof(FSINFO3res));
return 0;
}
static int nfs3_pathconf_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
PATHCONF3args *args = call->body.cbody.args;
PATHCONF3res reply;
if (args->object.data.data_len != 10)
{
// Example error
reply.status = NFS3ERR_INVAL;
}
else
{
// Fill info
reply.status = NFS3_OK;
reply.PATHCONF3res_u.resok.obj_attributes.attributes_follow = FALSE;
reply.PATHCONF3res_u.resok.linkmax = 0;
reply.PATHCONF3res_u.resok.name_max = 255;
reply.PATHCONF3res_u.resok.no_trunc = TRUE;
reply.PATHCONF3res_u.resok.chown_restricted = FALSE;
reply.PATHCONF3res_u.resok.case_insensitive = FALSE;
reply.PATHCONF3res_u.resok.case_preserving = TRUE;
}
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_PATHCONF3res, sizeof(PATHCONF3res));
return 0;
}
static int nfs3_commit_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
COMMIT3args *args = call->body.cbody.args;
COMMIT3res reply = { 0 };
// Just pretend we did fsync :-)
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_COMMIT3res, sizeof(COMMIT3res));
return 0;
}
static int mount3_mnt_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
dirpath *arg = call->body.cbody.args;
int flavor = AUTH_NONE;
mountres3 reply;
reply.fhs_status = MNT3_OK;
reply.mountres3_u.mountinfo.fhandle.fhandle3_len = 10;
reply.mountres3_u.mountinfo.fhandle.fhandle3_val = "roothandle";
reply.mountres3_u.mountinfo.auth_flavors.auth_flavors_len = 1;
reply.mountres3_u.mountinfo.auth_flavors.auth_flavors_val = &flavor;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_mountres3, sizeof(mountres3));
return 0;
}
static int mount3_dump_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
mountlist reply;
reply = (struct mountbody*)malloc(sizeof(struct mountbody));
reply->ml_hostname = "10.0.2.15";
reply->ml_directory = "/test";
reply->ml_next = NULL;
rpc_send_reply(rpc, call, NULL, (zdrproc_t)zdr_mountlist, sizeof(mountlist));
free(reply);
return 0;
}
static int mount3_umnt_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
dirpath *arg = call->body.cbody.args;
// do nothing
rpc_send_reply(rpc, call, NULL, (zdrproc_t)zdr_void, 0);
return 0;
}
static int mount3_umntall_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
// do nothing
rpc_send_reply(rpc, call, NULL, (zdrproc_t)zdr_void, 0);
return 0;
}
static int mount3_export_proc(struct rpc_context *rpc, struct rpc_msg *call)
{
exports reply;
reply = (struct exportnode*)malloc(sizeof(struct exportnode) + sizeof(struct groupnode));
reply->ex_dir = "/test";
reply->ex_groups = (struct groupnode*)(reply+1);
reply->ex_groups->gr_name = "10.0.2.15";
reply->ex_groups->gr_next = NULL;
reply->ex_next = NULL;
rpc_send_reply(rpc, call, &reply, (zdrproc_t)zdr_exports, sizeof(exports));
free(reply);
return 0;
}
struct service_proc nfs3_pt[22] = {
{NFS3_NULL, nfs3_null_proc, (zdrproc_t)zdr_void, 0},
{NFS3_GETATTR, nfs3_getattr_proc, (zdrproc_t)zdr_GETATTR3args, sizeof(GETATTR3args)},
{NFS3_SETATTR, nfs3_setattr_proc, (zdrproc_t)zdr_SETATTR3args, sizeof(SETATTR3args)},
{NFS3_LOOKUP, nfs3_lookup_proc, (zdrproc_t)zdr_LOOKUP3args, sizeof(LOOKUP3args)},
{NFS3_ACCESS, nfs3_access_proc, (zdrproc_t)zdr_ACCESS3args, sizeof(ACCESS3args)},
{NFS3_READLINK, nfs3_readlink_proc, (zdrproc_t)zdr_READLINK3args, sizeof(READLINK3args)},
{NFS3_READ, nfs3_read_proc, (zdrproc_t)zdr_READ3args, sizeof(READ3args)},
{NFS3_WRITE, nfs3_write_proc, (zdrproc_t)zdr_WRITE3args, sizeof(WRITE3args)},
{NFS3_CREATE, nfs3_create_proc, (zdrproc_t)zdr_CREATE3args, sizeof(CREATE3args)},
{NFS3_MKDIR, nfs3_mkdir_proc, (zdrproc_t)zdr_MKDIR3args, sizeof(MKDIR3args)},
{NFS3_SYMLINK, nfs3_symlink_proc, (zdrproc_t)zdr_SYMLINK3args, sizeof(SYMLINK3args)},
{NFS3_MKNOD, nfs3_mknod_proc, (zdrproc_t)zdr_MKNOD3args, sizeof(MKNOD3args)},
{NFS3_REMOVE, nfs3_remove_proc, (zdrproc_t)zdr_REMOVE3args, sizeof(REMOVE3args)},
{NFS3_RMDIR, nfs3_rmdir_proc, (zdrproc_t)zdr_RMDIR3args, sizeof(RMDIR3args)},
{NFS3_RENAME, nfs3_rename_proc, (zdrproc_t)zdr_RENAME3args, sizeof(RENAME3args)},
{NFS3_LINK, nfs3_link_proc, (zdrproc_t)zdr_LINK3args, sizeof(LINK3args)},
{NFS3_READDIR, nfs3_readdir_proc, (zdrproc_t)zdr_READDIR3args, sizeof(READDIR3args)},
{NFS3_READDIRPLUS, nfs3_readdirplus_proc, (zdrproc_t)zdr_READDIRPLUS3args, sizeof(READDIRPLUS3args)},
{NFS3_FSSTAT, nfs3_fsstat_proc, (zdrproc_t)zdr_FSSTAT3args, sizeof(FSSTAT3args)},
{NFS3_FSINFO, nfs3_fsinfo_proc, (zdrproc_t)zdr_FSINFO3args, sizeof(FSINFO3args)},
{NFS3_PATHCONF, nfs3_pathconf_proc, (zdrproc_t)zdr_PATHCONF3args, sizeof(PATHCONF3args)},
{NFS3_COMMIT, nfs3_commit_proc, (zdrproc_t)zdr_COMMIT3args, sizeof(COMMIT3args)},
};
struct service_proc nfs3_mount_pt[6] = {
{MOUNT3_NULL, nfs3_null_proc, (zdrproc_t)zdr_void, 0},
{MOUNT3_MNT, mount3_mnt_proc, (zdrproc_t)zdr_dirpath, sizeof(dirpath)},
{MOUNT3_DUMP, mount3_dump_proc, (zdrproc_t)zdr_void, 0},
{MOUNT3_UMNT, mount3_umnt_proc, (zdrproc_t)zdr_dirpath, sizeof(dirpath)},
{MOUNT3_UMNTALL, mount3_umntall_proc, (zdrproc_t)zdr_void, 0},
{MOUNT3_EXPORT, mount3_export_proc, (zdrproc_t)zdr_void, 0},
};