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  * $FreeBSD: src/usr.sbin/nscd/nscdcli.c,v 1.5 2008/10/23 00:28:21 delphij Exp $
  27  */
  28
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <sys/event.h>
  32 #include <sys/uio.h>
  33 #include <sys/un.h>
  34 #include <assert.h>
  35 #include <errno.h>
  36 #include <fcntl.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include "debug.h"
  42 #include "nscdcli.h"
  43 #include "protocol.h"
  44
  45 #define DEFAULT_NSCD_IO_TIMEOUT 4
  46
  47 static int safe_write(struct nscd_connection_ *, const void *, size_t);
  48 static int safe_read(struct nscd_connection_ *, void *, size_t);
  49 static int send_credentials(struct nscd_connection_ *, int);
  50
  51 static int
  52 safe_write(struct nscd_connection_ *connection, const void *data,
  53         size_t data_size)
  54 {
  55         struct kevent eventlist;
  56         int     nevents;
  57         size_t result;
  58         ssize_t s_result;
  59         struct timespec timeout;
  60
  61         if (data_size == 0)
  62                 return (0);
  63
  64         timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
  65         timeout.tv_nsec = 0;
  66         result = 0;
  67         do {
  68                 nevents = kevent(connection->write_queue, NULL, 0, &eventlist,
  69                         1, &timeout);
  70                 if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
  71                         s_result = write(connection->sockfd, data + result,
  72                                 eventlist.data < data_size - result ?
  73                                 eventlist.data : data_size - result);
  74                         if (s_result == -1)
  75                                 return (-1);
  76                         else
  77                                 result += s_result;
  78
  79                         if (eventlist.flags & EV_EOF)
  80                                 return (result < data_size ? -1 : 0);
  81                 } else
  82                         return (-1);
  83         } while (result < data_size);
  84
  85         return (0);
  86 }
  87
  88 static int
  89 safe_read(struct nscd_connection_ *connection, void *data, size_t data_size)
  90 {
  91         struct kevent eventlist;
  92         size_t result;
  93         ssize_t s_result;
  94         struct timespec timeout;
  95         int nevents;
  96
  97         if (data_size == 0)
  98                 return (0);
  99
 100         timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
 101         timeout.tv_nsec = 0;
 102         result = 0;
 103         do {
 104                 nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
 105                         &timeout);
 106                 if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
 107                         s_result = read(connection->sockfd, data + result,
 108                         eventlist.data <= data_size - result ? eventlist.data :
 109                                 data_size - result);
 110                         if (s_result == -1)
 111                                 return (-1);
 112                         else
 113                                 result += s_result;
 114
 115                         if (eventlist.flags & EV_EOF)
 116                                 return (result < data_size ? -1 : 0);
 117                 } else
 118                         return (-1);
 119         } while (result < data_size);
 120
 121         return (0);
 122 }
 123
 124 static int
 125 send_credentials(struct nscd_connection_ *connection, int type)
 126 {
 127         struct kevent eventlist;
 128         int nevents;
 129         ssize_t result;
 130         int res;
 131
 132         struct msghdr   cred_hdr;
 133         struct iovec    iov;
 134
 135         struct {
 136                 struct cmsghdr  hdr;
 137                 struct cmsgcred creds;
 138         } cmsg;
 139
 140         TRACE_IN(send_credentials);
 141         memset(&cmsg, 0, sizeof(cmsg));
 142         cmsg.hdr.cmsg_len = sizeof(cmsg);
 143         cmsg.hdr.cmsg_level = SOL_SOCKET;
 144         cmsg.hdr.cmsg_type = SCM_CREDS;
 145
 146         memset(&cred_hdr, 0, sizeof(struct msghdr));
 147         cred_hdr.msg_iov = &iov;
 148         cred_hdr.msg_iovlen = 1;
 149         cred_hdr.msg_control = &cmsg;
 150         cred_hdr.msg_controllen = sizeof(cmsg);
 151
 152         iov.iov_base = &type;
 153         iov.iov_len = sizeof(int);
 154
 155         EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 156                 NOTE_LOWAT, sizeof(int), NULL);
 157         res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 158
 159         nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
 160         if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
 161                 result = (sendmsg(connection->sockfd, &cred_hdr, 0) == -1) ? -1
 162                         : 0;
 163                 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 164                         0, 0, NULL);
 165                 kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 166                 TRACE_OUT(send_credentials);
 167                 return (result);
 168         } else {
 169                 TRACE_OUT(send_credentials);
 170                 return (-1);
 171         }
 172 }
 173
 174 struct nscd_connection_ *
 175 open_nscd_connection__(struct nscd_connection_params const *params)
 176 {
 177         struct nscd_connection_ *retval;
 178         struct kevent eventlist;
 179         struct sockaddr_un      client_address;
 180         int client_address_len, client_socket;
 181         int res;
 182
 183         TRACE_IN(open_nscd_connection);
 184         assert(params != NULL);
 185
 186         client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
 187         client_address.sun_family = PF_LOCAL;
 188         strlcpy(client_address.sun_path, params->socket_path,
 189                 sizeof(client_address.sun_path));
 190         client_address_len = sizeof(client_address.sun_family) +
 191                 strlen(client_address.sun_path) + 1;
 192
 193         res = connect(client_socket, (struct sockaddr *)&client_address,
 194                 client_address_len);
 195         if (res == -1) {
 196                 close(client_socket);
 197                 TRACE_OUT(open_nscd_connection);
 198                 return (NULL);
 199         }
 200         fcntl(client_socket, F_SETFL, O_NONBLOCK);
 201
 202         retval = calloc(1, sizeof(struct nscd_connection_));
 203         assert(retval != NULL);
 204
 205         retval->sockfd = client_socket;
 206
 207         retval->write_queue = kqueue();
 208         assert(retval->write_queue != -1);
 209
 210         EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD,
 211                 0, 0, NULL);
 212         res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL);
 213
 214         retval->read_queue = kqueue();
 215         assert(retval->read_queue != -1);
 216
 217         EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD,
 218                 0, 0, NULL);
 219         res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL);
 220
 221         TRACE_OUT(open_nscd_connection);
 222         return (retval);
 223 }
 224
 225 void
 226 close_nscd_connection__(struct nscd_connection_ *connection)
 227 {
 228
 229         TRACE_IN(close_nscd_connection);
 230         assert(connection != NULL);
 231
 232         close(connection->sockfd);
 233         close(connection->read_queue);
 234         close(connection->write_queue);
 235         free(connection);
 236         TRACE_OUT(close_nscd_connection);
 237 }
 238
 239 int
 240 nscd_transform__(struct nscd_connection_ *connection,
 241         const char *entry_name, int transformation_type)
 242 {
 243         size_t name_size;
 244         int error_code;
 245         int result;
 246
 247         TRACE_IN(nscd_transform);
 248
 249         error_code = -1;
 250         result = 0;
 251         result = send_credentials(connection, CET_TRANSFORM_REQUEST);
 252         if (result != 0)
 253                 goto fin;
 254
 255         if (entry_name != NULL)
 256                 name_size = strlen(entry_name);
 257         else
 258                 name_size = 0;
 259
 260         result = safe_write(connection, &name_size, sizeof(size_t));
 261         if (result != 0)
 262                 goto fin;
 263
 264         result = safe_write(connection, &transformation_type, sizeof(int));
 265         if (result != 0)
 266                 goto fin;
 267
 268         if (entry_name != NULL) {
 269                 result = safe_write(connection, entry_name, name_size);
 270                 if (result != 0)
 271                         goto fin;
 272         }
 273
 274         result = safe_read(connection, &error_code, sizeof(int));
 275         if (result != 0)
 276                 error_code = -1;
 277
 278 fin:
 279         TRACE_OUT(nscd_transform);
 280         return (error_code);
 281 }