1/* os-local.c -- platform-specific domain socket code */ 2/* $OpenLDAP$ */ 3/* This work is part of OpenLDAP Software <http://www.openldap.org/>. 4 * 5 * Copyright 1998-2011 The OpenLDAP Foundation. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted only as authorized by the OpenLDAP 10 * Public License. 11 * 12 * A copy of this license is available in the file LICENSE in the 13 * top-level directory of the distribution or, alternatively, at 14 * <http://www.OpenLDAP.org/license.html>. 15 */ 16/* Portions Copyright (c) 1995 Regents of the University of Michigan. 17 * All rights reserved. 18 */ 19/* Portions (C) Copyright PADL Software Pty Ltd. 1999 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that this notice is preserved 22 * and that due credit is given to PADL Software Pty Ltd. This software 23 * is provided ``as is'' without express or implied warranty. 24 */ 25 26#include "portable.h" 27 28#ifdef LDAP_PF_LOCAL 29 30#include <stdio.h> 31 32#include <ac/stdlib.h> 33 34#include <ac/errno.h> 35#include <ac/socket.h> 36#include <ac/string.h> 37#include <ac/time.h> 38#include <ac/unistd.h> 39 40#ifdef HAVE_SYS_STAT_H 41#include <sys/stat.h> 42#endif 43#ifdef HAVE_SYS_UIO_H 44#include <sys/uio.h> 45#endif 46 47#ifdef HAVE_IO_H 48#include <io.h> 49#endif /* HAVE_IO_H */ 50#ifdef HAVE_FCNTL_H 51#include <fcntl.h> 52#endif 53 54#include "ldap-int.h" 55#include "ldap_defaults.h" 56 57#ifdef LDAP_DEBUG 58 59#define oslocal_debug(ld,fmt,arg1,arg2,arg3) \ 60do { \ 61 ldap_log_printf(ld, LDAP_DEBUG_TRACE, fmt, arg1, arg2, arg3); \ 62} while(0) 63 64#else 65 66#define oslocal_debug(ld,fmt,arg1,arg2,arg3) ((void)0) 67 68#endif /* LDAP_DEBUG */ 69 70static void 71ldap_pvt_set_errno(int err) 72{ 73 errno = err; 74} 75 76static int 77ldap_pvt_ndelay_on(LDAP *ld, int fd) 78{ 79 oslocal_debug(ld, "ldap_ndelay_on: %d\n",fd,0,0); 80 return ber_pvt_socket_set_nonblock( fd, 1 ); 81} 82 83static int 84ldap_pvt_ndelay_off(LDAP *ld, int fd) 85{ 86 oslocal_debug(ld, "ldap_ndelay_off: %d\n",fd,0,0); 87 return ber_pvt_socket_set_nonblock( fd, 0 ); 88} 89 90static ber_socket_t 91ldap_pvt_socket(LDAP *ld) 92{ 93 ber_socket_t s = socket(PF_LOCAL, SOCK_STREAM, 0); 94 oslocal_debug(ld, "ldap_new_socket: %d\n",s,0,0); 95#ifdef FD_CLOEXEC 96 fcntl(s, F_SETFD, FD_CLOEXEC); 97#endif 98 return ( s ); 99} 100 101static int 102ldap_pvt_close_socket(LDAP *ld, int s) 103{ 104 oslocal_debug(ld, "ldap_close_socket: %d\n",s,0,0); 105 return tcp_close(s); 106} 107 108#undef TRACE 109#define TRACE do { \ 110 char ebuf[128]; \ 111 oslocal_debug(ld, \ 112 "ldap_is_socket_ready: errror on socket %d: errno: %d (%s)\n", \ 113 s, \ 114 errno, \ 115 AC_STRERROR_R(errno, ebuf, sizeof ebuf)); \ 116} while( 0 ) 117 118/* 119 * check the socket for errors after select returned. 120 */ 121static int 122ldap_pvt_is_socket_ready(LDAP *ld, int s) 123{ 124 oslocal_debug(ld, "ldap_is_sock_ready: %d\n",s,0,0); 125 126#if defined( notyet ) /* && defined( SO_ERROR ) */ 127{ 128 int so_errno; 129 ber_socklen_t dummy = sizeof(so_errno); 130 if ( getsockopt( s, SOL_SOCKET, SO_ERROR, &so_errno, &dummy ) 131 == AC_SOCKET_ERROR ) 132 { 133 return -1; 134 } 135 if ( so_errno ) { 136 ldap_pvt_set_errno(so_errno); 137 TRACE; 138 return -1; 139 } 140 return 0; 141} 142#else 143{ 144 /* error slippery */ 145 struct sockaddr_un sa; 146 char ch; 147 ber_socklen_t dummy = sizeof(sa); 148 if ( getpeername( s, (struct sockaddr *) &sa, &dummy ) 149 == AC_SOCKET_ERROR ) 150 { 151 /* XXX: needs to be replace with ber_stream_read() */ 152 (void)read(s, &ch, 1); 153 TRACE; 154 return -1; 155 } 156 return 0; 157} 158#endif 159 return -1; 160} 161#undef TRACE 162 163#ifdef LDAP_PF_LOCAL_SENDMSG 164static const char abandonPDU[] = {LDAP_TAG_MESSAGE, 6, 165 LDAP_TAG_MSGID, 1, 0, LDAP_REQ_ABANDON, 1, 0}; 166#endif 167 168static int 169ldap_pvt_connect(LDAP *ld, ber_socket_t s, struct sockaddr_un *sa, int async) 170{ 171 int rc; 172 struct timeval tv, *opt_tv = NULL; 173 174 if ( ld->ld_options.ldo_tm_net.tv_sec >= 0 ) { 175 tv = ld->ld_options.ldo_tm_net; 176 opt_tv = &tv; 177 } 178 179 oslocal_debug(ld, "ldap_connect_timeout: fd: %d tm: %ld async: %d\n", 180 s, opt_tv ? tv.tv_sec : -1L, async); 181 182 if ( ldap_pvt_ndelay_on(ld, s) == -1 ) return -1; 183 184 if ( connect(s, (struct sockaddr *) sa, sizeof(struct sockaddr_un)) 185 != AC_SOCKET_ERROR ) 186 { 187 if ( ldap_pvt_ndelay_off(ld, s) == -1 ) return -1; 188 189#ifdef LDAP_PF_LOCAL_SENDMSG 190 /* Send a dummy message with access rights. Remote side will 191 * obtain our uid/gid by fstat'ing this descriptor. The 192 * descriptor permissions must match exactly, and we also 193 * send the socket name, which must also match. 194 */ 195sendcred: 196 { 197 int fds[2]; 198 ber_socklen_t salen = sizeof(*sa); 199 if (pipe(fds) == 0) { 200 /* Abandon, noop, has no reply */ 201 struct iovec iov; 202 struct msghdr msg = {0}; 203# ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL 204# ifndef CMSG_SPACE 205# define CMSG_SPACE(len) (_CMSG_ALIGN( sizeof(struct cmsghdr)) + _CMSG_ALIGN(len) ) 206# endif 207# ifndef CMSG_LEN 208# define CMSG_LEN(len) (_CMSG_ALIGN( sizeof(struct cmsghdr)) + (len) ) 209# endif 210 union { 211 struct cmsghdr cm; 212 unsigned char control[CMSG_SPACE(sizeof(int))]; 213 } control_un; 214 struct cmsghdr *cmsg; 215# endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ 216 msg.msg_name = NULL; 217 msg.msg_namelen = 0; 218 iov.iov_base = (char *) abandonPDU; 219 iov.iov_len = sizeof abandonPDU; 220 msg.msg_iov = &iov; 221 msg.msg_iovlen = 1; 222# ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL 223 msg.msg_control = control_un.control; 224 msg.msg_controllen = sizeof( control_un.control ); 225 msg.msg_flags = 0; 226 227 cmsg = CMSG_FIRSTHDR( &msg ); 228 cmsg->cmsg_len = CMSG_LEN( sizeof(int) ); 229 cmsg->cmsg_level = SOL_SOCKET; 230 cmsg->cmsg_type = SCM_RIGHTS; 231 232 *((int *)CMSG_DATA(cmsg)) = fds[0]; 233# else 234 msg.msg_accrights = (char *)fds; 235 msg.msg_accrightslen = sizeof(int); 236# endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */ 237 getpeername( s, (struct sockaddr *) sa, &salen ); 238 fchmod( fds[0], S_ISUID|S_IRWXU ); 239 write( fds[1], sa, salen ); 240 sendmsg( s, &msg, 0 ); 241 close(fds[0]); 242 close(fds[1]); 243 } 244 } 245#endif 246 return 0; 247 } 248 249 if ( errno != EINPROGRESS && errno != EWOULDBLOCK ) return -1; 250 251#ifdef notyet 252 if ( async ) return -2; 253#endif 254 255#ifdef HAVE_POLL 256 { 257 struct pollfd fd; 258 int timeout = INFTIM; 259 260 if( opt_tv != NULL ) timeout = TV2MILLISEC( &tv ); 261 262 fd.fd = s; 263 fd.events = POLL_WRITE; 264 265 do { 266 fd.revents = 0; 267 rc = poll( &fd, 1, timeout ); 268 } while( rc == AC_SOCKET_ERROR && errno == EINTR && 269 LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_RESTART )); 270 271 if( rc == AC_SOCKET_ERROR ) return rc; 272 273 if( fd.revents & POLL_WRITE ) { 274 if ( ldap_pvt_is_socket_ready(ld, s) == -1 ) return -1; 275 if ( ldap_pvt_ndelay_off(ld, s) == -1 ) return -1; 276#ifdef LDAP_PF_LOCAL_SENDMSG 277 goto sendcred; 278#else 279 return ( 0 ); 280#endif 281 } 282 } 283#else 284 { 285 fd_set wfds, *z=NULL; 286 287#ifdef FD_SETSIZE 288 if ( s >= FD_SETSIZE ) { 289 rc = AC_SOCKET_ERROR; 290 tcp_close( s ); 291 ldap_pvt_set_errno( EMFILE ); 292 return rc; 293 } 294#endif 295 do { 296 FD_ZERO(&wfds); 297 FD_SET(s, &wfds ); 298 rc = select( ldap_int_tblsize, z, &wfds, z, opt_tv ? &tv : NULL ); 299 } while( rc == AC_SOCKET_ERROR && errno == EINTR && 300 LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_RESTART )); 301 302 if( rc == AC_SOCKET_ERROR ) return rc; 303 304 if ( FD_ISSET(s, &wfds) ) { 305 if ( ldap_pvt_is_socket_ready(ld, s) == -1 ) return -1; 306 if ( ldap_pvt_ndelay_off(ld, s) == -1 ) return -1; 307#ifdef LDAP_PF_LOCAL_SENDMSG 308 goto sendcred; 309#else 310 return ( 0 ); 311#endif 312 } 313 } 314#endif 315 316 oslocal_debug(ld, "ldap_connect_timeout: timed out\n",0,0,0); 317 ldap_pvt_set_errno( ETIMEDOUT ); 318 return ( -1 ); 319} 320 321int 322ldap_connect_to_path(LDAP *ld, Sockbuf *sb, LDAPURLDesc *srv, int async) 323{ 324 struct sockaddr_un server; 325 ber_socket_t s; 326 int rc; 327 const char *path = srv->lud_host; 328 329 oslocal_debug(ld, "ldap_connect_to_path\n",0,0,0); 330 331 if ( path == NULL || path[0] == '\0' ) { 332 path = LDAPI_SOCK; 333 } else { 334 if ( strlen(path) > (sizeof( server.sun_path ) - 1) ) { 335 ldap_pvt_set_errno( ENAMETOOLONG ); 336 return -1; 337 } 338 } 339 340 s = ldap_pvt_socket( ld ); 341 if ( s == AC_SOCKET_INVALID ) { 342 return -1; 343 } 344 345 oslocal_debug(ld, "ldap_connect_to_path: Trying %s\n", path, 0, 0); 346 347 memset( &server, '\0', sizeof(server) ); 348 server.sun_family = AF_LOCAL; 349 strcpy( server.sun_path, path ); 350 351 rc = ldap_pvt_connect(ld, s, &server, async); 352 353 if (rc == 0) { 354 rc = ldap_int_connect_cbs( ld, sb, &s, srv, (struct sockaddr *)&server ); 355 } 356 if ( rc ) { 357 ldap_pvt_close_socket(ld, s); 358 } 359 return rc; 360} 361#else 362static int dummy; 363#endif /* LDAP_PF_LOCAL */ 364