usr.sbin/nscd/nscdcli.c

   1 /*-
   2  * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/types.h>
  32
  33 #include <sys/event.h>
  34 #include <sys/socket.h>
  35 #include <sys/uio.h>
  36 #include <sys/un.h>
  37
  38 #include <assert.h>
  39 #include <errno.h>
  40 #include <fcntl.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "debug.h"
  46 #include "nscdcli.h"
  47 #include "protocol.h"
  48
  49 #define DEFAULT_NSCD_IO_TIMEOUT 4
  50
  51 static int safe_write(struct nscd_connection_ *, const void *, size_t);
  52 static int safe_read(struct nscd_connection_ *, void *, size_t);
  53 static int send_credentials(struct nscd_connection_ *, int);
  54
  55 static int
  56 safe_write(struct nscd_connection_ *connection, const void *data,
  57         size_t data_size)
  58 {
  59         struct kevent eventlist;
  60         int     nevents;
  61         size_t result;
  62         ssize_t s_result;
  63         struct timespec timeout;
  64
  65         if (data_size == 0)
  66                 return (0);
  67
  68         timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
  69         timeout.tv_nsec = 0;
  70         result = 0;
  71         do {
  72                 nevents = kevent(connection->write_queue, NULL, 0, &eventlist,
  73                         1, &timeout);
  74                 if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
  75                         s_result = write(connection->sockfd,
  76                                 (char *)data + result,
  77                                 (size_t)eventlist.data < data_size - result ?
  78                                 (size_t)eventlist.data : data_size - result);
  79                         if (s_result == -1)
  80                                 return (-1);
  81                         else
  82                                 result += s_result;
  83
  84                         if (eventlist.flags & EV_EOF)
  85                                 return (result < data_size ? -1 : 0);
  86                 } else
  87                         return (-1);
  88         } while (result < data_size);
  89
  90         return (0);
  91 }
  92
  93 static int
  94 safe_read(struct nscd_connection_ *connection, void *data, size_t data_size)
  95 {
  96         struct kevent eventlist;
  97         size_t result;
  98         ssize_t s_result;
  99         struct timespec timeout;
 100         int nevents;
 101
 102         if (data_size == 0)
 103                 return (0);
 104
 105         timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
 106         timeout.tv_nsec = 0;
 107         result = 0;
 108         do {
 109                 nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
 110                         &timeout);
 111                 if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
 112                         s_result = read(connection->sockfd,
 113                                 (char *)data + result,
 114                                 (size_t)eventlist.data <= data_size - result ?
 115                                 (size_t)eventlist.data : data_size - result);
 116                         if (s_result == -1)
 117                                 return (-1);
 118                         else
 119                                 result += s_result;
 120
 121                         if (eventlist.flags & EV_EOF)
 122                                 return (result < data_size ? -1 : 0);
 123                 } else
 124                         return (-1);
 125         } while (result < data_size);
 126
 127         return (0);
 128 }
 129
 130 static int
 131 send_credentials(struct nscd_connection_ *connection, int type)
 132 {
 133         struct kevent eventlist;
 134         int nevents;
 135         ssize_t result;
 136         int res;
 137
 138         struct msghdr   cred_hdr;
 139         struct iovec    iov;
 140
 141         struct {
 142                 struct cmsghdr  hdr;
 143                 struct cmsgcred creds;
 144         } cmsg;
 145
 146         TRACE_IN(send_credentials);
 147         memset(&cmsg, 0, sizeof(cmsg));
 148         cmsg.hdr.cmsg_len = sizeof(cmsg);
 149         cmsg.hdr.cmsg_level = SOL_SOCKET;
 150         cmsg.hdr.cmsg_type = SCM_CREDS;
 151
 152         memset(&cred_hdr, 0, sizeof(struct msghdr));
 153         cred_hdr.msg_iov = &iov;
 154         cred_hdr.msg_iovlen = 1;
 155         cred_hdr.msg_control = &cmsg;
 156         cred_hdr.msg_controllen = sizeof(cmsg);
 157
 158         iov.iov_base = &type;
 159         iov.iov_len = sizeof(int);
 160
 161         EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 162                 NOTE_LOWAT, sizeof(int), NULL);
 163         res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 164
 165         nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
 166         if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
 167                 result = (sendmsg(connection->sockfd, &cred_hdr, 0) == -1) ? -1
 168                         : 0;
 169                 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 170                         0, 0, NULL);
 171                 kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 172                 TRACE_OUT(send_credentials);
 173                 return (result);
 174         } else {
 175                 TRACE_OUT(send_credentials);
 176                 return (-1);
 177         }
 178 }
 179
 180 struct nscd_connection_ *
 181 open_nscd_connection__(struct nscd_connection_params const *params)
 182 {
 183         struct nscd_connection_ *retval;
 184         struct kevent eventlist;
 185         struct sockaddr_un      client_address;
 186         int client_address_len, client_socket;
 187         int res;
 188
 189         TRACE_IN(open_nscd_connection);
 190         assert(params != NULL);
 191
 192         client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
 193         client_address.sun_family = PF_LOCAL;
 194         strlcpy(client_address.sun_path, params->socket_path,
 195                 sizeof(client_address.sun_path));
 196         client_address_len = sizeof(client_address.sun_family) +
 197                 strlen(client_address.sun_path) + 1;
 198
 199         res = connect(client_socket, (struct sockaddr *)&client_address,
 200                 client_address_len);
 201         if (res == -1) {
 202                 close(client_socket);
 203                 TRACE_OUT(open_nscd_connection);
 204                 return (NULL);
 205         }
 206         fcntl(client_socket, F_SETFL, O_NONBLOCK);
 207
 208         retval = calloc(1, sizeof(*retval));
 209         assert(retval != NULL);
 210
 211         retval->sockfd = client_socket;
 212
 213         retval->write_queue = kqueue();
 214         assert(retval->write_queue != -1);
 215
 216         EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD,
 217                 0, 0, NULL);
 218         res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL);
 219
 220         retval->read_queue = kqueue();
 221         assert(retval->read_queue != -1);
 222
 223         EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD,
 224                 0, 0, NULL);
 225         res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL);
 226
 227         TRACE_OUT(open_nscd_connection);
 228         return (retval);
 229 }
 230
 231 void
 232 close_nscd_connection__(struct nscd_connection_ *connection)
 233 {
 234
 235         TRACE_IN(close_nscd_connection);
 236         assert(connection != NULL);
 237
 238         close(connection->sockfd);
 239         close(connection->read_queue);
 240         close(connection->write_queue);
 241         free(connection);
 242         TRACE_OUT(close_nscd_connection);
 243 }
 244
 245 int
 246 nscd_transform__(struct nscd_connection_ *connection,
 247         const char *entry_name, int transformation_type)
 248 {
 249         size_t name_size;
 250         int error_code;
 251         int result;
 252
 253         TRACE_IN(nscd_transform);
 254
 255         error_code = -1;
 256         result = 0;
 257         result = send_credentials(connection, CET_TRANSFORM_REQUEST);
 258         if (result != 0)
 259                 goto fin;
 260
 261         if (entry_name != NULL)
 262                 name_size = strlen(entry_name);
 263         else
 264                 name_size = 0;
 265
 266         result = safe_write(connection, &name_size, sizeof(size_t));
 267         if (result != 0)
 268                 goto fin;
 269
 270         result = safe_write(connection, &transformation_type, sizeof(int));
 271         if (result != 0)
 272                 goto fin;
 273
 274         if (entry_name != NULL) {
 275                 result = safe_write(connection, entry_name, name_size);
 276                 if (result != 0)
 277                         goto fin;
 278         }
 279
 280         result = safe_read(connection, &error_code, sizeof(int));
 281         if (result != 0)
 282                 error_code = -1;
 283
 284 fin:
 285         TRACE_OUT(nscd_transform);
 286         return (error_code);
 287 }