2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Tim Potter 2000-2001
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /* the last IP received from */
25 struct in_addr lastip;
27 /* the last port received from */
30 int smb_read_error = 0;
32 static char *get_socket_addr(int fd)
35 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
36 socklen_t length = sizeof(sa);
37 static fstring addr_buf;
39 fstrcpy(addr_buf,"0.0.0.0");
45 if (getsockname(fd, &sa, &length) < 0) {
46 DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) ));
50 fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
55 static int get_socket_port(int fd)
58 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
59 socklen_t length = sizeof(sa);
64 if (getsockname(fd, &sa, &length) < 0) {
65 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
69 return ntohs(sockin->sin_port);
72 /****************************************************************************
73 Determine if a file descriptor is in fact a socket.
74 ****************************************************************************/
76 BOOL is_a_socket(int fd)
81 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
84 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
86 typedef struct smb_socket_option {
94 static const smb_socket_option socket_options[] = {
95 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
96 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
97 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
99 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
102 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
105 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
108 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
110 #ifdef IPTOS_LOWDELAY
111 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
113 #ifdef IPTOS_THROUGHPUT
114 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
117 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
120 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
123 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
126 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
129 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
132 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
135 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
139 /****************************************************************************
140 Print socket options.
141 ****************************************************************************/
143 static void print_socket_options(int s)
147 const smb_socket_option *p = &socket_options[0];
149 /* wrapped in if statement to prevent streams leak in SCO Openserver 5.0 */
150 /* reported on samba-technical --jerry */
151 if ( DEBUGLEVEL >= 5 ) {
152 for (; p->name != NULL; p++) {
153 if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) {
154 DEBUG(5,("Could not test socket option %s.\n", p->name));
156 DEBUG(5,("socket option %s = %d\n",p->name,value));
162 /****************************************************************************
163 Set user socket options.
164 ****************************************************************************/
166 void set_socket_options(int fd, const char *options)
170 while (next_token(&options,tok," \t,", sizeof(tok))) {
174 BOOL got_value = False;
176 if ((p = strchr_m(tok,'='))) {
182 for (i=0;socket_options[i].name;i++)
183 if (strequal(socket_options[i].name,tok))
186 if (!socket_options[i].name) {
187 DEBUG(0,("Unknown socket option %s\n",tok));
191 switch (socket_options[i].opttype) {
194 ret = setsockopt(fd,socket_options[i].level,
195 socket_options[i].option,(char *)&value,sizeof(int));
200 DEBUG(0,("syntax error - %s does not take a value\n",tok));
203 int on = socket_options[i].value;
204 ret = setsockopt(fd,socket_options[i].level,
205 socket_options[i].option,(char *)&on,sizeof(int));
211 DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) ));
214 print_socket_options(fd);
217 /****************************************************************************
219 ****************************************************************************/
221 ssize_t read_udp_socket(int fd,char *buf,size_t len)
224 struct sockaddr_in sock;
225 socklen_t socklen = sizeof(sock);
227 memset((char *)&sock,'\0',socklen);
228 memset((char *)&lastip,'\0',sizeof(lastip));
229 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,(struct sockaddr *)&sock,&socklen);
231 DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno)));
235 lastip = sock.sin_addr;
236 lastport = ntohs(sock.sin_port);
238 DEBUG(10,("read_udp_socket: lastip %s lastport %d read: %lu\n",
239 inet_ntoa(lastip), lastport, (unsigned long)ret));
244 /****************************************************************************
245 Read data from a socket with a timout in msec.
246 mincount = if timeout, minimum to read before returning
247 maxcount = number to be read.
248 time_out = timeout in milliseconds
249 ****************************************************************************/
251 ssize_t read_socket_with_timeout(int fd,char *buf,size_t mincnt,size_t maxcnt,unsigned int time_out)
257 struct timeval timeout;
259 /* just checking .... */
267 if (mincnt == 0) mincnt = maxcnt;
269 while (nread < mincnt) {
270 readret = sys_read(fd, buf + nread, maxcnt - nread);
273 DEBUG(5,("read_socket_with_timeout: blocking read. EOF from client.\n"));
274 smb_read_error = READ_EOF;
279 DEBUG(0,("read_socket_with_timeout: read error = %s.\n", strerror(errno) ));
280 smb_read_error = READ_ERROR;
285 return((ssize_t)nread);
288 /* Most difficult - timeout read */
289 /* If this is ever called on a disk file and
290 mincnt is greater then the filesize then
291 system performance will suffer severely as
292 select always returns true on disk files */
294 /* Set initial timeout */
295 timeout.tv_sec = (time_t)(time_out / 1000);
296 timeout.tv_usec = (long)(1000 * (time_out % 1000));
298 for (nread=0; nread < mincnt; ) {
302 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
306 /* something is wrong. Maybe the socket is dead? */
307 DEBUG(0,("read_socket_with_timeout: timeout read. select error = %s.\n", strerror(errno) ));
308 smb_read_error = READ_ERROR;
312 /* Did we timeout ? */
314 DEBUG(10,("read_socket_with_timeout: timeout read. select timed out.\n"));
315 smb_read_error = READ_TIMEOUT;
319 readret = sys_read(fd, buf+nread, maxcnt-nread);
322 /* we got EOF on the file descriptor */
323 DEBUG(5,("read_socket_with_timeout: timeout read. EOF from client.\n"));
324 smb_read_error = READ_EOF;
329 /* the descriptor is probably dead */
330 DEBUG(0,("read_socket_with_timeout: timeout read. read error = %s.\n", strerror(errno) ));
331 smb_read_error = READ_ERROR;
338 /* Return the number we got */
339 return (ssize_t)nread;
342 /****************************************************************************
343 Read data from the client, reading exactly N bytes.
344 ****************************************************************************/
346 ssize_t read_data(int fd,char *buffer,size_t N)
354 ret = sys_read(fd,buffer + total,N - total);
357 DEBUG(10,("read_data: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
358 smb_read_error = READ_EOF;
363 DEBUG(0,("read_data: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
364 smb_read_error = READ_ERROR;
369 return (ssize_t)total;
372 /****************************************************************************
373 Read data from a socket, reading exactly N bytes.
374 ****************************************************************************/
376 static ssize_t read_socket_data(int fd,char *buffer,size_t N)
384 ret = sys_read(fd,buffer + total,N - total);
387 DEBUG(10,("read_socket_data: recv of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
388 smb_read_error = READ_EOF;
393 DEBUG(0,("read_socket_data: recv failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
394 smb_read_error = READ_ERROR;
399 return (ssize_t)total;
402 /****************************************************************************
404 ****************************************************************************/
406 ssize_t write_data(int fd, const char *buffer, size_t N)
412 ret = sys_write(fd,buffer + total,N - total);
415 DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) ));
423 return (ssize_t)total;
426 /****************************************************************************
427 Write data to a socket - use send rather than write.
428 ****************************************************************************/
430 static ssize_t write_socket_data(int fd, const char *buffer, size_t N)
436 ret = sys_send(fd,buffer + total,N - total,0);
439 DEBUG(0,("write_socket_data: write failure. Error = %s\n", strerror(errno) ));
447 return (ssize_t)total;
450 /****************************************************************************
452 ****************************************************************************/
454 ssize_t write_socket(int fd, const char *buf, size_t len)
458 DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
459 ret = write_socket_data(fd,buf,len);
461 DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
463 DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
464 (int)len, fd, strerror(errno) ));
469 /****************************************************************************
470 Send a keepalive packet (rfc1002).
471 ****************************************************************************/
473 BOOL send_keepalive(int client)
475 unsigned char buf[4];
477 buf[0] = SMBkeepalive;
478 buf[1] = buf[2] = buf[3] = 0;
480 return(write_socket_data(client,(char *)buf,4) == 4);
484 /****************************************************************************
485 Read 4 bytes of a smb packet and return the smb length of the packet.
486 Store the result in the buffer.
487 This version of the function will return a length of zero on receiving
489 Timeout is in milliseconds.
490 ****************************************************************************/
492 static ssize_t read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout)
500 ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout) == 4);
502 ok = (read_socket_data(fd,inbuf,4) == 4);
507 len = smb_len(inbuf);
508 msg_type = CVAL(inbuf,0);
510 if (msg_type == SMBkeepalive)
511 DEBUG(5,("Got keepalive packet\n"));
514 DEBUG(10,("got smb length of %lu\n",(unsigned long)len));
519 /****************************************************************************
520 Read 4 bytes of a smb packet and return the smb length of the packet.
521 Store the result in the buffer. This version of the function will
522 never return a session keepalive (length of zero).
523 Timeout is in milliseconds.
524 ****************************************************************************/
526 ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
531 len = read_smb_length_return_keepalive(fd, inbuf, timeout);
536 /* Ignore session keepalives. */
537 if(CVAL(inbuf,0) != SMBkeepalive)
541 DEBUG(10,("read_smb_length: got smb length of %lu\n",
542 (unsigned long)len));
547 /****************************************************************************
548 Read an smb from a fd. Note that the buffer *MUST* be of size
549 BUFFER_SIZE+SAFETY_MARGIN.
550 The timeout is in milliseconds.
551 This function will return on receipt of a session keepalive packet.
552 Doesn't check the MAC on signed packets.
553 ****************************************************************************/
555 BOOL receive_smb_raw(int fd, char *buffer, unsigned int timeout)
561 memset(buffer,'\0',smb_size + 100);
563 len = read_smb_length_return_keepalive(fd,buffer,timeout);
565 DEBUG(10,("receive_smb_raw: length < 0!\n"));
568 * Correct fix. smb_read_error may have already been
569 * set. Only set it here if not already set. Global
570 * variables still suck :-). JRA.
573 if (smb_read_error == 0)
574 smb_read_error = READ_ERROR;
579 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
580 * of header. Don't print the error if this fits.... JRA.
583 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
584 DEBUG(0,("Invalid packet length! (%lu bytes).\n",(unsigned long)len));
585 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
588 * Correct fix. smb_read_error may have already been
589 * set. Only set it here if not already set. Global
590 * variables still suck :-). JRA.
593 if (smb_read_error == 0)
594 smb_read_error = READ_ERROR;
600 ret = read_socket_data(fd,buffer+4,len);
602 if (smb_read_error == 0)
603 smb_read_error = READ_ERROR;
607 /* not all of samba3 properly checks for packet-termination of strings. This
608 ensures that we don't run off into empty space. */
609 SSVAL(buffer+4,len, 0);
615 /****************************************************************************
616 Wrapper for receive_smb_raw().
617 Checks the MAC on signed packets.
618 ****************************************************************************/
620 BOOL receive_smb(int fd, char *buffer, unsigned int timeout)
622 if (!receive_smb_raw(fd, buffer, timeout)) {
626 /* Check the incoming SMB signature. */
627 if (!srv_check_sign_mac(buffer, True)) {
628 DEBUG(0, ("receive_smb: SMB Signature verification failed on incoming packet!\n"));
629 if (smb_read_error == 0)
630 smb_read_error = READ_BAD_SIG;
637 /****************************************************************************
639 ****************************************************************************/
641 BOOL send_smb(int fd, char *buffer)
647 /* Sign the outgoing packet if required. */
648 srv_calculate_sign_mac(buffer);
650 len = smb_len(buffer) + 4;
652 while (nwritten < len) {
653 ret = write_socket(fd,buffer+nwritten,len - nwritten);
655 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
656 (int)len,(int)ret, strerror(errno) ));
665 /****************************************************************************
666 Open a socket of the specified type, port, and address for incoming data.
667 ****************************************************************************/
669 int open_socket_in( int type, int port, int dlevel, uint32 socket_addr, BOOL rebind )
671 struct sockaddr_in sock;
674 memset( (char *)&sock, '\0', sizeof(sock) );
676 #ifdef HAVE_SOCK_SIN_LEN
677 sock.sin_len = sizeof(sock);
679 sock.sin_port = htons( port );
680 sock.sin_family = AF_INET;
681 sock.sin_addr.s_addr = socket_addr;
683 res = socket( AF_INET, type, 0 );
686 dbgtext( "open_socket_in(): socket() call failed: " );
687 dbgtext( "%s\n", strerror( errno ) );
692 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
694 int val = rebind ? 1 : 0;
695 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) == -1 ) {
696 if( DEBUGLVL( dlevel ) ) {
697 dbgtext( "open_socket_in(): setsockopt: " );
698 dbgtext( "SO_REUSEADDR = %s ", val?"True":"False" );
699 dbgtext( "on port %d failed ", port );
700 dbgtext( "with error = %s\n", strerror(errno) );
704 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) == -1 ) {
705 if( DEBUGLVL( dlevel ) ) {
706 dbgtext( "open_socket_in(): setsockopt: ");
707 dbgtext( "SO_REUSEPORT = %s ", val?"True":"False" );
708 dbgtext( "on port %d failed ", port );
709 dbgtext( "with error = %s\n", strerror(errno) );
712 #endif /* SO_REUSEPORT */
715 /* now we've got a socket - we need to bind it */
716 if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) {
717 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) {
718 dbgtext( "bind failed on port %d ", port );
719 dbgtext( "socket_addr = %s.\n", inet_ntoa( sock.sin_addr ) );
720 dbgtext( "Error = %s\n", strerror(errno) );
726 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
731 /****************************************************************************
732 Create an outgoing socket. timeout is in milliseconds.
733 **************************************************************************/
735 int open_socket_out(int type, struct in_addr *addr, int port ,int timeout)
737 struct sockaddr_in sock_out;
739 int connect_loop = 10;
742 /* create a socket to write to */
743 res = socket(PF_INET, type, 0);
745 DEBUG(0,("socket error (%s)\n", strerror(errno)));
749 if (type != SOCK_STREAM)
752 memset((char *)&sock_out,'\0',sizeof(sock_out));
753 putip((char *)&sock_out.sin_addr,(char *)addr);
755 sock_out.sin_port = htons( port );
756 sock_out.sin_family = PF_INET;
758 /* set it non-blocking */
759 set_blocking(res,False);
761 DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port));
763 /* and connect it to the destination */
766 ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));
768 /* Some systems return EAGAIN when they mean EINPROGRESS */
769 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
770 errno == EAGAIN) && (connect_loop < timeout) ) {
771 smb_msleep(connect_loop);
772 timeout -= connect_loop;
773 connect_loop += increment;
774 if (increment < 250) {
775 /* After 8 rounds we end up at a max of 255 msec */
781 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
783 DEBUG(1,("timeout connecting to %s:%d\n",inet_ntoa(*addr),port));
790 if (ret < 0 && errno == EISCONN) {
797 DEBUG(2,("error connecting to %s:%d (%s)\n",
798 inet_ntoa(*addr),port,strerror(errno)));
803 /* set it blocking again */
804 set_blocking(res,True);
809 /****************************************************************************
810 Create an outgoing TCP socket to any of the addrs. This is for
811 simultaneous connects to port 445 and 139 of a host or even a variety
812 of DC's all of which are equivalent for our purposes.
813 **************************************************************************/
815 BOOL open_any_socket_out(struct sockaddr_in *addrs, int num_addrs,
816 int timeout, int *fd_index, int *fd)
818 int i, resulting_index, res;
822 fd_set r_fds, wr_fds;
826 int connect_loop = 10000; /* 10 milliseconds */
828 timeout *= 1000; /* convert to microseconds */
830 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
835 resulting_index = -1;
837 for (i=0; i<num_addrs; i++)
840 for (i=0; i<num_addrs; i++) {
841 sockets[i] = socket(PF_INET, SOCK_STREAM, 0);
844 set_blocking(sockets[i], False);
848 good_connect = False;
850 for (i=0; i<num_addrs; i++) {
852 if (sockets[i] == -1)
855 if (connect(sockets[i], (struct sockaddr *)&(addrs[i]),
856 sizeof(*addrs)) == 0) {
857 /* Rather unlikely as we are non-blocking, but it
858 * might actually happen. */
863 if (errno == EINPROGRESS || errno == EALREADY ||
865 /* These are the error messages that something is
868 } else if (errno != 0) {
869 /* There was a direct error */
876 /* All of the connect's resulted in real error conditions */
880 /* Lets see if any of the connect attempts succeeded */
886 for (i=0; i<num_addrs; i++) {
887 if (sockets[i] == -1)
889 FD_SET(sockets[i], &wr_fds);
890 FD_SET(sockets[i], &r_fds);
891 if (sockets[i]>maxfd)
896 tv.tv_usec = connect_loop;
898 res = sys_select(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
906 for (i=0; i<num_addrs; i++) {
908 if (sockets[i] == -1)
911 /* Stevens, Network Programming says that if there's a
912 * successful connect, the socket is only writable. Upon an
913 * error, it's both readable and writable. */
915 if (FD_ISSET(sockets[i], &r_fds) &&
916 FD_ISSET(sockets[i], &wr_fds)) {
917 /* readable and writable, so it's an error */
923 if (!FD_ISSET(sockets[i], &r_fds) &&
924 FD_ISSET(sockets[i], &wr_fds)) {
925 /* Only writable, so it's connected */
933 timeout -= connect_loop;
937 if (connect_loop > timeout)
938 connect_loop = timeout;
942 for (i=0; i<num_addrs; i++) {
943 if (i == resulting_index)
949 if (resulting_index >= 0) {
950 *fd_index = resulting_index;
951 *fd = sockets[*fd_index];
952 set_blocking(*fd, True);
957 return (resulting_index >= 0);
959 /****************************************************************************
960 Open a connected UDP socket to host on port
961 **************************************************************************/
963 int open_udp_socket(const char *host, int port)
965 int type = SOCK_DGRAM;
966 struct sockaddr_in sock_out;
968 struct in_addr *addr;
970 addr = interpret_addr2(host);
972 res = socket(PF_INET, type, 0);
977 memset((char *)&sock_out,'\0',sizeof(sock_out));
978 putip((char *)&sock_out.sin_addr,(char *)addr);
979 sock_out.sin_port = htons(port);
980 sock_out.sin_family = PF_INET;
982 if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
991 /* the following 3 client_*() functions are nasty ways of allowing
992 some generic functions to get info that really should be hidden in
993 particular modules */
994 static int client_fd = -1;
996 void client_setfd(int fd)
1001 char *client_name(void)
1003 return get_peer_name(client_fd,False);
1006 char *client_addr(void)
1008 return get_peer_addr(client_fd);
1011 char *client_socket_addr(void)
1013 return get_socket_addr(client_fd);
1016 int client_socket_port(void)
1018 return get_socket_port(client_fd);
1021 struct in_addr *client_inaddr(struct sockaddr *sa)
1023 struct sockaddr_in *sockin = (struct sockaddr_in *) (sa);
1024 socklen_t length = sizeof(*sa);
1026 if (getpeername(client_fd, sa, &length) < 0) {
1027 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
1031 return &sockin->sin_addr;
1034 /*******************************************************************
1035 Matchname - determine if host name matches IP address. Used to
1036 confirm a hostname lookup to prevent spoof attacks.
1037 ******************************************************************/
1039 static BOOL matchname(char *remotehost,struct in_addr addr)
1044 if ((hp = sys_gethostbyname(remotehost)) == 0) {
1045 DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n", remotehost));
1050 * Make sure that gethostbyname() returns the "correct" host name.
1051 * Unfortunately, gethostbyname("localhost") sometimes yields
1052 * "localhost.domain". Since the latter host name comes from the
1053 * local DNS, we just have to trust it (all bets are off if the local
1054 * DNS is perverted). We always check the address list, though.
1057 if (!strequal(remotehost, hp->h_name)
1058 && !strequal(remotehost, "localhost")) {
1059 DEBUG(0,("host name/name mismatch: %s != %s\n",
1060 remotehost, hp->h_name));
1064 /* Look up the host address in the address list we just got. */
1065 for (i = 0; hp->h_addr_list[i]; i++) {
1066 if (memcmp(hp->h_addr_list[i], (char *) & addr, sizeof(addr)) == 0)
1071 * The host name does not map to the original host address. Perhaps
1072 * someone has compromised a name server. More likely someone botched
1073 * it, but that could be dangerous, too.
1076 DEBUG(0,("host name/address mismatch: %s != %s\n",
1077 inet_ntoa(addr), hp->h_name));
1081 /*******************************************************************
1082 Return the DNS name of the remote end of a socket.
1083 ******************************************************************/
1085 char *get_peer_name(int fd, BOOL force_lookup)
1087 static pstring name_buf;
1089 static fstring addr_buf;
1091 struct in_addr addr;
1094 /* reverse lookups can be *very* expensive, and in many
1095 situations won't work because many networks don't link dhcp
1096 with dns. To avoid the delay we avoid the lookup if
1098 if (!lp_hostname_lookups() && (force_lookup == False)) {
1099 return get_peer_addr(fd);
1102 p = get_peer_addr(fd);
1104 /* it might be the same as the last one - save some DNS work */
1105 if (strcmp(p, addr_buf) == 0)
1108 pstrcpy(name_buf,"UNKNOWN");
1112 fstrcpy(addr_buf, p);
1114 addr = *interpret_addr2(p);
1116 /* Look up the remote host name. */
1117 if ((hp = gethostbyaddr((char *)&addr.s_addr, sizeof(addr.s_addr), AF_INET)) == 0) {
1118 DEBUG(1,("Gethostbyaddr failed for %s\n",p));
1119 pstrcpy(name_buf, p);
1121 pstrcpy(name_buf,(char *)hp->h_name);
1122 if (!matchname(name_buf, addr)) {
1123 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1124 pstrcpy(name_buf,"UNKNOWN");
1128 /* can't pass the same source and dest strings in when you
1129 use --enable-developer or the clobber_region() call will
1132 pstrcpy( tmp_name, name_buf );
1133 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1134 if (strstr(name_buf,"..")) {
1135 pstrcpy(name_buf, "UNKNOWN");
1141 /*******************************************************************
1142 Return the IP addr of the remote end of a socket as a string.
1143 ******************************************************************/
1145 char *get_peer_addr(int fd)
1148 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
1149 socklen_t length = sizeof(sa);
1150 static fstring addr_buf;
1152 fstrcpy(addr_buf,"0.0.0.0");
1158 if (getpeername(fd, &sa, &length) < 0) {
1159 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
1163 fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
1168 /*******************************************************************
1169 Create protected unix domain socket.
1171 Some unixes cannot set permissions on a ux-dom-sock, so we
1172 have to make sure that the directory contains the protection
1173 permissions instead.
1174 ******************************************************************/
1176 int create_pipe_sock(const char *socket_dir,
1177 const char *socket_name,
1180 #ifdef HAVE_UNIXSOCKET
1181 struct sockaddr_un sunaddr;
1187 old_umask = umask(0);
1189 /* Create the socket directory or reuse the existing one */
1191 if (lstat(socket_dir, &st) == -1) {
1192 if (errno == ENOENT) {
1193 /* Create directory */
1194 if (mkdir(socket_dir, dir_perms) == -1) {
1195 DEBUG(0, ("error creating socket directory "
1196 "%s: %s\n", socket_dir,
1201 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1202 socket_dir, strerror(errno)));
1206 /* Check ownership and permission on existing directory */
1207 if (!S_ISDIR(st.st_mode)) {
1208 DEBUG(0, ("socket directory %s isn't a directory\n",
1212 if ((st.st_uid != sec_initial_uid()) ||
1213 ((st.st_mode & 0777) != dir_perms)) {
1214 DEBUG(0, ("invalid permissions on socket directory "
1215 "%s\n", socket_dir));
1220 /* Create the socket file */
1222 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1229 pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
1232 memset(&sunaddr, 0, sizeof(sunaddr));
1233 sunaddr.sun_family = AF_UNIX;
1234 safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
1236 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1237 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1242 if (listen(sock, 5) == -1) {
1243 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1259 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1261 #endif /* HAVE_UNIXSOCKET */