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 #include <sys/socket.h>
  33 #include <sys/event.h>
  34 #include <sys/uio.h>
  35 #include <sys/un.h>
  36 #include <assert.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "debug.h"
  44 #include "cachedcli.h"
  45 #include "protocol.h"
  46
  47 #define DEFAULT_CACHED_IO_TIMEOUT       4
  48
  49 static int safe_write(struct cached_connection_ *, const void *, size_t);
  50 static int safe_read(struct cached_connection_ *, void *, size_t);
  51 static int send_credentials(struct cached_connection_ *, int);
  52
  53 static int
  54 safe_write(struct cached_connection_ *connection, const void *data,
  55         size_t data_size)
  56 {
  57         struct kevent eventlist;
  58         int     nevents;
  59         size_t result;
  60         ssize_t s_result;
  61         struct timespec timeout;
  62
  63         if (data_size == 0)
  64                 return (0);
  65
  66         timeout.tv_sec = DEFAULT_CACHED_IO_TIMEOUT;
  67         timeout.tv_nsec = 0;
  68         result = 0;
  69         do {
  70                 nevents = kevent(connection->write_queue, NULL, 0, &eventlist,
  71                         1, &timeout);
  72                 if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
  73                         s_result = write(connection->sockfd, data + result,
  74                                 eventlist.data < data_size - result ?
  75                                 eventlist.data : data_size - result);
  76                         if (s_result == -1)
  77                                 return (-1);
  78                         else
  79                                 result += s_result;
  80
  81                         if (eventlist.flags & EV_EOF)
  82                                 return (result < data_size ? -1 : 0);
  83                 } else
  84                         return (-1);
  85         } while (result < data_size);
  86
  87         return (0);
  88 }
  89
  90 static int
  91 safe_read(struct cached_connection_ *connection, void *data, size_t data_size)
  92 {
  93         struct kevent eventlist;
  94         size_t result;
  95         ssize_t s_result;
  96         struct timespec timeout;
  97         int nevents;
  98
  99         if (data_size == 0)
 100                 return (0);
 101
 102         timeout.tv_sec = DEFAULT_CACHED_IO_TIMEOUT;
 103         timeout.tv_nsec = 0;
 104         result = 0;
 105         do {
 106                 nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
 107                         &timeout);
 108                 if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
 109                         s_result = read(connection->sockfd, data + result,
 110                         eventlist.data <= data_size - result ? eventlist.data :
 111                                 data_size - result);
 112                         if (s_result == -1)
 113                                 return (-1);
 114                         else
 115                                 result += s_result;
 116
 117                         if (eventlist.flags & EV_EOF)
 118                                 return (result < data_size ? -1 : 0);
 119                 } else
 120                         return (-1);
 121         } while (result < data_size);
 122
 123         return (0);
 124 }
 125
 126 static int
 127 send_credentials(struct cached_connection_ *connection, int type)
 128 {
 129         struct kevent eventlist;
 130         int nevents;
 131         ssize_t result;
 132         int res;
 133
 134         struct msghdr   cred_hdr;
 135         struct iovec    iov;
 136
 137         struct {
 138                 struct cmsghdr  hdr;
 139                 struct cmsgcred creds;
 140         } cmsg;
 141
 142         TRACE_IN(send_credentials);
 143         memset(&cmsg, 0, sizeof(cmsg));
 144         cmsg.hdr.cmsg_len = sizeof(cmsg);
 145         cmsg.hdr.cmsg_level = SOL_SOCKET;
 146         cmsg.hdr.cmsg_type = SCM_CREDS;
 147
 148         memset(&cred_hdr, 0, sizeof(struct msghdr));
 149         cred_hdr.msg_iov = &iov;
 150         cred_hdr.msg_iovlen = 1;
 151         cred_hdr.msg_control = &cmsg;
 152         cred_hdr.msg_controllen = sizeof(cmsg);
 153
 154         iov.iov_base = &type;
 155         iov.iov_len = sizeof(int);
 156
 157         EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 158                 NOTE_LOWAT, sizeof(int), NULL);
 159         res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 160
 161         nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
 162         if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
 163                 result = (sendmsg(connection->sockfd, &cred_hdr, 0) == -1) ? -1
 164                         : 0;
 165                 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 166                         0, 0, NULL);
 167                 kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 168                 TRACE_OUT(send_credentials);
 169                 return (result);
 170         } else {
 171                 TRACE_OUT(send_credentials);
 172                 return (-1);
 173         }
 174 }
 175
 176 struct cached_connection_ *
 177 open_cached_connection__(struct cached_connection_params const *params)
 178 {
 179         struct cached_connection_ *retval;
 180         struct kevent eventlist;
 181         struct sockaddr_un      client_address;
 182         int client_address_len, client_socket;
 183         int res;
 184
 185         TRACE_IN(open_cached_connection);
 186         assert(params != NULL);
 187
 188         client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
 189         client_address.sun_family = PF_LOCAL;
 190         strncpy(client_address.sun_path, params->socket_path,
 191                 sizeof(client_address.sun_path));
 192         client_address_len = sizeof(client_address.sun_family) +
 193                 strlen(client_address.sun_path) + 1;
 194
 195         res = connect(client_socket, (struct sockaddr *)&client_address,
 196                 client_address_len);
 197         if (res == -1) {
 198                 close(client_socket);
 199                 TRACE_OUT(open_cached_connection);
 200                 return (NULL);
 201         }
 202         fcntl(client_socket, F_SETFL, O_NONBLOCK);
 203
 204         retval = malloc(sizeof(struct cached_connection_));
 205         assert(retval != NULL);
 206         memset(retval, 0, sizeof(struct cached_connection_));
 207
 208         retval->sockfd = client_socket;
 209
 210         retval->write_queue = kqueue();
 211         assert(retval->write_queue != -1);
 212
 213         EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD,
 214                 0, 0, NULL);
 215         res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL);
 216
 217         retval->read_queue = kqueue();
 218         assert(retval->read_queue != -1);
 219
 220         EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD,
 221                 0, 0, NULL);
 222         res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL);
 223
 224         TRACE_OUT(open_cached_connection);
 225         return (retval);
 226 }
 227
 228 void
 229 close_cached_connection__(struct cached_connection_ *connection)
 230 {
 231
 232         TRACE_IN(close_cached_connection);
 233         assert(connection != NULL);
 234
 235         close(connection->sockfd);
 236         close(connection->read_queue);
 237         close(connection->write_queue);
 238         free(connection);
 239         TRACE_OUT(close_cached_connection);
 240 }
 241
 242 int
 243 cached_transform__(struct cached_connection_ *connection,
 244         const char *entry_name, int transformation_type)
 245 {
 246         size_t name_size;
 247         int error_code;
 248         int result;
 249
 250         TRACE_IN(cached_transform);
 251
 252         error_code = -1;
 253         result = 0;
 254         result = send_credentials(connection, CET_TRANSFORM_REQUEST);
 255         if (result != 0)
 256                 goto fin;
 257
 258         if (entry_name != NULL)
 259                 name_size = strlen(entry_name);
 260         else
 261                 name_size = 0;
 262
 263         result = safe_write(connection, &name_size, sizeof(size_t));
 264         if (result != 0)
 265                 goto fin;
 266
 267         result = safe_write(connection, &transformation_type, sizeof(int));
 268         if (result != 0)
 269                 goto fin;
 270
 271         if (entry_name != NULL) {
 272                 result = safe_write(connection, entry_name, name_size);
 273                 if (result != 0)
 274                         goto fin;
 275         }
 276
 277         result = safe_read(connection, &error_code, sizeof(int));
 278         if (result != 0)
 279                 error_code = -1;
 280
 281 fin:
 282         TRACE_OUT(cached_transform);
 283         return (error_code);
 284 }