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         union {
 134                 struct cmsghdr hdr;
 135                 char pad[CMSG_SPACE(sizeof(struct cmsgcred))];
 136         } cmsg;
 137         struct msghdr mhdr;
 138         struct iovec iov;
 139         struct kevent eventlist;
 140         int nevents;
 141         ssize_t result;
 142         int res;
 143
 144         TRACE_IN(send_credentials);
 145         memset(&cmsg, 0, sizeof(cmsg));
 146         cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
 147         cmsg.hdr.cmsg_level = SOL_SOCKET;
 148         cmsg.hdr.cmsg_type = SCM_CREDS;
 149
 150         memset(&mhdr, 0, sizeof(mhdr));
 151         mhdr.msg_iov = &iov;
 152         mhdr.msg_iovlen = 1;
 153         mhdr.msg_control = &cmsg;
 154         mhdr.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
 155
 156         iov.iov_base = &type;
 157         iov.iov_len = sizeof(int);
 158
 159         EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 160             NOTE_LOWAT, sizeof(int), NULL);
 161         res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 162
 163         nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
 164         if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
 165                 result = sendmsg(connection->sockfd, &mhdr, 0) == -1 ? -1 : 0;
 166                 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 167                     0, 0, NULL);
 168                 kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 169                 TRACE_OUT(send_credentials);
 170                 return (result);
 171         } else {
 172                 TRACE_OUT(send_credentials);
 173                 return (-1);
 174         }
 175 }
 176
 177 struct nscd_connection_ *
 178 open_nscd_connection__(struct nscd_connection_params const *params)
 179 {
 180         struct nscd_connection_ *retval;
 181         struct kevent eventlist;
 182         struct sockaddr_un      client_address;
 183         int client_address_len, client_socket;
 184         int res;
 185
 186         TRACE_IN(open_nscd_connection);
 187         assert(params != NULL);
 188
 189         client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
 190         client_address.sun_family = PF_LOCAL;
 191         strlcpy(client_address.sun_path, params->socket_path,
 192                 sizeof(client_address.sun_path));
 193         client_address_len = sizeof(client_address.sun_family) +
 194                 strlen(client_address.sun_path) + 1;
 195
 196         res = connect(client_socket, (struct sockaddr *)&client_address,
 197                 client_address_len);
 198         if (res == -1) {
 199                 close(client_socket);
 200                 TRACE_OUT(open_nscd_connection);
 201                 return (NULL);
 202         }
 203         fcntl(client_socket, F_SETFL, O_NONBLOCK);
 204
 205         retval = calloc(1, sizeof(*retval));
 206         assert(retval != NULL);
 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_nscd_connection);
 225         return (retval);
 226 }
 227
 228 void
 229 close_nscd_connection__(struct nscd_connection_ *connection)
 230 {
 231
 232         TRACE_IN(close_nscd_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_nscd_connection);
 240 }
 241
 242 int
 243 nscd_transform__(struct nscd_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(nscd_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(nscd_transform);
 283         return (error_code);
 284 }