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 "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, 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 nscd_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_NSCD_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 nscd_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 nscd_connection_ * 177 open_nscd_connection__(struct nscd_connection_params const *params) 178 { 179 struct nscd_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_nscd_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_nscd_connection); 200 return (NULL); 201 } 202 fcntl(client_socket, F_SETFL, O_NONBLOCK); 203 204 retval = malloc(sizeof(struct nscd_connection_)); 205 assert(retval != NULL); 206 memset(retval, 0, sizeof(struct nscd_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_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 } 285