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 #include <sys/types.h>
  30
  31 #include <sys/event.h>
  32 #include <sys/socket.h>
  33 #include <sys/uio.h>
  34 #include <sys/un.h>
  35
  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 "nscdcli.h"
  45 #include "protocol.h"
  46
  47 #define DEFAULT_NSCD_IO_TIMEOUT 4
  48
  49 static int safe_write(struct nscd_connection_ *, const void *, size_t);
  50 static int safe_read(struct nscd_connection_ *, void *, size_t);
  51 static int send_credentials(struct nscd_connection_ *, int);
  52
  53 static int
  54 safe_write(struct nscd_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_NSCD_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,
  74                                 (char *)data + result,
  75                                 (size_t)eventlist.data < data_size - result ?
  76                                 (size_t)eventlist.data : data_size - result);
  77                         if (s_result == -1)
  78                                 return (-1);
  79                         else
  80                                 result += s_result;
  81
  82                         if (eventlist.flags & EV_EOF)
  83                                 return (result < data_size ? -1 : 0);
  84                 } else
  85                         return (-1);
  86         } while (result < data_size);
  87
  88         return (0);
  89 }
  90
  91 static int
  92 safe_read(struct nscd_connection_ *connection, void *data, size_t data_size)
  93 {
  94         struct kevent eventlist;
  95         size_t result;
  96         ssize_t s_result;
  97         struct timespec timeout;
  98         int nevents;
  99
 100         if (data_size == 0)
 101                 return (0);
 102
 103         timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
 104         timeout.tv_nsec = 0;
 105         result = 0;
 106         do {
 107                 nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
 108                         &timeout);
 109                 if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
 110                         s_result = read(connection->sockfd,
 111                                 (char *)data + result,
 112                                 (size_t)eventlist.data <= data_size - result ?
 113                                 (size_t)eventlist.data : data_size - result);
 114                         if (s_result == -1)
 115                                 return (-1);
 116                         else
 117                                 result += s_result;
 118
 119                         if (eventlist.flags & EV_EOF)
 120                                 return (result < data_size ? -1 : 0);
 121                 } else
 122                         return (-1);
 123         } while (result < data_size);
 124
 125         return (0);
 126 }
 127
 128 static int
 129 send_credentials(struct nscd_connection_ *connection, int type)
 130 {
 131         union {
 132                 struct cmsghdr hdr;
 133                 char pad[CMSG_SPACE(sizeof(struct cmsgcred))];
 134         } cmsg;
 135         struct msghdr mhdr;
 136         struct iovec iov;
 137         struct kevent eventlist;
 138         int nevents;
 139         ssize_t result;
 140
 141         TRACE_IN(send_credentials);
 142         memset(&cmsg, 0, sizeof(cmsg));
 143         cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
 144         cmsg.hdr.cmsg_level = SOL_SOCKET;
 145         cmsg.hdr.cmsg_type = SCM_CREDS;
 146
 147         memset(&mhdr, 0, sizeof(mhdr));
 148         mhdr.msg_iov = &iov;
 149         mhdr.msg_iovlen = 1;
 150         mhdr.msg_control = &cmsg;
 151         mhdr.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
 152
 153         iov.iov_base = &type;
 154         iov.iov_len = sizeof(int);
 155
 156         EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
 157             NOTE_LOWAT, sizeof(int), NULL);
 158         kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
 159
 160         nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
 161         if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
 162                 result = sendmsg(connection->sockfd, &mhdr, 0) == -1 ? -1 : 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(*retval));
 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 }