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 51static int safe_write(struct nscd_connection_ *, const void *, size_t); 52static int safe_read(struct nscd_connection_ *, void *, size_t); 53static int send_credentials(struct nscd_connection_ *, int); 54 55static int 56safe_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 93static int 94safe_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 130static int 131send_credentials(struct nscd_connection_ *connection, int type) 132{ 133 struct kevent eventlist; 134 int nevents; 135 ssize_t result; 136 int res; 137 138 struct msghdr cred_hdr; 139 struct iovec iov; 140 141 struct { 142 struct cmsghdr hdr; 143 struct cmsgcred creds; 144 } cmsg; 145 146 TRACE_IN(send_credentials); 147 memset(&cmsg, 0, sizeof(cmsg)); 148 cmsg.hdr.cmsg_len = sizeof(cmsg); 149 cmsg.hdr.cmsg_level = SOL_SOCKET; 150 cmsg.hdr.cmsg_type = SCM_CREDS; 151 152 memset(&cred_hdr, 0, sizeof(struct msghdr)); 153 cred_hdr.msg_iov = &iov; 154 cred_hdr.msg_iovlen = 1; 155 cred_hdr.msg_control = &cmsg; 156 cred_hdr.msg_controllen = sizeof(cmsg); 157 158 iov.iov_base = &type; 159 iov.iov_len = sizeof(int); 160 161 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD, 162 NOTE_LOWAT, sizeof(int), NULL); 163 res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL); 164 165 nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL); 166 if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) { 167 result = (sendmsg(connection->sockfd, &cred_hdr, 0) == -1) ? -1 168 : 0; 169 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD, 170 0, 0, NULL); 171 kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL); 172 TRACE_OUT(send_credentials); 173 return (result); 174 } else { 175 TRACE_OUT(send_credentials); 176 return (-1); 177 } 178} 179 180struct nscd_connection_ * 181open_nscd_connection__(struct nscd_connection_params const *params) 182{ 183 struct nscd_connection_ *retval; 184 struct kevent eventlist; 185 struct sockaddr_un client_address; 186 int client_address_len, client_socket; 187 int res; 188 189 TRACE_IN(open_nscd_connection); 190 assert(params != NULL); 191 192 client_socket = socket(PF_LOCAL, SOCK_STREAM, 0); 193 client_address.sun_family = PF_LOCAL; 194 strlcpy(client_address.sun_path, params->socket_path, 195 sizeof(client_address.sun_path)); 196 client_address_len = sizeof(client_address.sun_family) + 197 strlen(client_address.sun_path) + 1; 198 199 res = connect(client_socket, (struct sockaddr *)&client_address, 200 client_address_len); 201 if (res == -1) { 202 close(client_socket); 203 TRACE_OUT(open_nscd_connection); 204 return (NULL); 205 } 206 fcntl(client_socket, F_SETFL, O_NONBLOCK); 207 208 retval = calloc(1, sizeof(*retval)); 209 assert(retval != NULL); 210 211 retval->sockfd = client_socket; 212 213 retval->write_queue = kqueue(); 214 assert(retval->write_queue != -1); 215 216 EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD, 217 0, 0, NULL); 218 res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL); 219 220 retval->read_queue = kqueue(); 221 assert(retval->read_queue != -1); 222 223 EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD, 224 0, 0, NULL); 225 res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL); 226 227 TRACE_OUT(open_nscd_connection); 228 return (retval); 229} 230 231void 232close_nscd_connection__(struct nscd_connection_ *connection) 233{ 234 235 TRACE_IN(close_nscd_connection); 236 assert(connection != NULL); 237 238 close(connection->sockfd); 239 close(connection->read_queue); 240 close(connection->write_queue); 241 free(connection); 242 TRACE_OUT(close_nscd_connection); 243} 244 245int 246nscd_transform__(struct nscd_connection_ *connection, 247 const char *entry_name, int transformation_type) 248{ 249 size_t name_size; 250 int error_code; 251 int result; 252 253 TRACE_IN(nscd_transform); 254 255 error_code = -1; 256 result = 0; 257 result = send_credentials(connection, CET_TRANSFORM_REQUEST); 258 if (result != 0) 259 goto fin; 260 261 if (entry_name != NULL) 262 name_size = strlen(entry_name); 263 else 264 name_size = 0; 265 266 result = safe_write(connection, &name_size, sizeof(size_t)); 267 if (result != 0) 268 goto fin; 269 270 result = safe_write(connection, &transformation_type, sizeof(int)); 271 if (result != 0) 272 goto fin; 273 274 if (entry_name != NULL) { 275 result = safe_write(connection, entry_name, name_size); 276 if (result != 0) 277 goto fin; 278 } 279 280 result = safe_read(connection, &error_code, sizeof(int)); 281 if (result != 0) 282 error_code = -1; 283 284fin: 285 TRACE_OUT(nscd_transform); 286 return (error_code); 287} 288