2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Tim Potter 2000-2001
6 Copyright (C) Jeremy Allison 1992-2005
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 /* the following 3 client_*() functions are nasty ways of allowing
26 some generic functions to get info that really should be hidden in
28 static int client_fd = -1;
29 /* What to print out on a client disconnect error. */
30 static char client_ip_string[16];
32 void client_setfd(int fd)
35 safe_strcpy(client_ip_string, get_peer_addr(client_fd), sizeof(client_ip_string)-1);
38 static char *get_socket_addr(int fd)
41 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
42 socklen_t length = sizeof(sa);
43 static fstring addr_buf;
45 fstrcpy(addr_buf,"0.0.0.0");
51 if (getsockname(fd, &sa, &length) < 0) {
52 DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) ));
56 fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
61 static int get_socket_port(int fd)
64 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
65 socklen_t length = sizeof(sa);
70 if (getsockname(fd, &sa, &length) < 0) {
71 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
75 return ntohs(sockin->sin_port);
78 char *client_name(void)
80 return get_peer_name(client_fd,False);
83 char *client_addr(void)
85 return get_peer_addr(client_fd);
88 char *client_socket_addr(void)
90 return get_socket_addr(client_fd);
93 int client_socket_port(void)
95 return get_socket_port(client_fd);
98 struct in_addr *client_inaddr(struct sockaddr *sa)
100 struct sockaddr_in *sockin = (struct sockaddr_in *) (sa);
101 socklen_t length = sizeof(*sa);
103 if (getpeername(client_fd, sa, &length) < 0) {
104 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
108 return &sockin->sin_addr;
111 /* the last IP received from */
112 struct in_addr lastip;
114 /* the last port received from */
117 int smb_read_error = 0;
119 /****************************************************************************
120 Determine if a file descriptor is in fact a socket.
121 ****************************************************************************/
123 BOOL is_a_socket(int fd)
128 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
131 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
133 typedef struct smb_socket_option {
141 static const smb_socket_option socket_options[] = {
142 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
143 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
144 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
146 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
149 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
152 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
155 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
157 #ifdef IPTOS_LOWDELAY
158 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
160 #ifdef IPTOS_THROUGHPUT
161 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
164 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
167 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
170 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
173 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
176 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
179 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
182 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
185 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
189 /****************************************************************************
190 Print socket options.
191 ****************************************************************************/
193 static void print_socket_options(int s)
197 const smb_socket_option *p = &socket_options[0];
199 /* wrapped in if statement to prevent streams leak in SCO Openserver 5.0 */
200 /* reported on samba-technical --jerry */
201 if ( DEBUGLEVEL >= 5 ) {
202 for (; p->name != NULL; p++) {
203 if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) {
204 DEBUG(5,("Could not test socket option %s.\n", p->name));
206 DEBUG(5,("socket option %s = %d\n",p->name,value));
212 /****************************************************************************
213 Set user socket options.
214 ****************************************************************************/
216 void set_socket_options(int fd, const char *options)
220 while (next_token(&options,tok," \t,", sizeof(tok))) {
224 BOOL got_value = False;
226 if ((p = strchr_m(tok,'='))) {
232 for (i=0;socket_options[i].name;i++)
233 if (strequal(socket_options[i].name,tok))
236 if (!socket_options[i].name) {
237 DEBUG(0,("Unknown socket option %s\n",tok));
241 switch (socket_options[i].opttype) {
244 ret = setsockopt(fd,socket_options[i].level,
245 socket_options[i].option,(char *)&value,sizeof(int));
250 DEBUG(0,("syntax error - %s does not take a value\n",tok));
253 int on = socket_options[i].value;
254 ret = setsockopt(fd,socket_options[i].level,
255 socket_options[i].option,(char *)&on,sizeof(int));
261 DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) ));
264 print_socket_options(fd);
267 /****************************************************************************
269 ****************************************************************************/
271 ssize_t read_udp_socket(int fd,char *buf,size_t len)
274 struct sockaddr_in sock;
275 socklen_t socklen = sizeof(sock);
277 memset((char *)&sock,'\0',socklen);
278 memset((char *)&lastip,'\0',sizeof(lastip));
279 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,(struct sockaddr *)&sock,&socklen);
281 DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno)));
285 lastip = sock.sin_addr;
286 lastport = ntohs(sock.sin_port);
288 DEBUG(10,("read_udp_socket: lastip %s lastport %d read: %lu\n",
289 inet_ntoa(lastip), lastport, (unsigned long)ret));
296 Socket routines from HEAD - maybe re-enable in future. JRA.
298 /****************************************************************************
299 Work out if we've timed out.
300 ****************************************************************************/
302 static BOOL timeout_until(struct timeval *timeout, const struct timeval *endtime)
309 t_dif = usec_time_diff(endtime, &now);
314 timeout->tv_sec = (t_dif / (SMB_BIG_INT)1000000);
315 timeout->tv_usec = (t_dif % (SMB_BIG_INT)1000000);
319 /****************************************************************************
320 Read data from the client, reading exactly N bytes, or until endtime timeout.
321 Use with a non-blocking socket if endtime != NULL.
322 ****************************************************************************/
324 ssize_t read_data_until(int fd,char *buffer,size_t N, const struct timeval *endtime)
333 if (endtime != NULL) {
335 struct timeval timeout;
338 if (!timeout_until(&timeout, endtime)) {
339 DEBUG(10,("read_data_until: read timed out\n"));
340 smb_read_error = READ_TIMEOUT;
347 /* Select but ignore EINTR. */
348 selrtn = sys_select_intr(fd+1, &r_fds, NULL, NULL, &timeout);
350 /* something is wrong. Maybe the socket is dead? */
351 DEBUG(0,("read_data_until: select error = %s.\n", strerror(errno) ));
352 smb_read_error = READ_ERROR;
356 /* Did we timeout ? */
358 DEBUG(10,("read_data_until: select timed out.\n"));
359 smb_read_error = READ_TIMEOUT;
364 ret = sys_read(fd,buffer + total,N - total);
367 DEBUG(10,("read_data_until: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
368 smb_read_error = READ_EOF;
373 if (errno == EAGAIN) {
374 /* Non-blocking socket with no data available. Try select again. */
377 DEBUG(0,("read_data_until: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
378 smb_read_error = READ_ERROR;
383 return (ssize_t)total;
387 /****************************************************************************
388 Read data from a socket with a timout in msec.
389 mincount = if timeout, minimum to read before returning
390 maxcount = number to be read.
391 time_out = timeout in milliseconds
392 ****************************************************************************/
394 ssize_t read_socket_with_timeout(int fd,char *buf,size_t mincnt,size_t maxcnt,unsigned int time_out)
400 struct timeval timeout;
402 /* just checking .... */
414 while (nread < mincnt) {
415 readret = sys_read(fd, buf + nread, maxcnt - nread);
418 DEBUG(5,("read_socket_with_timeout: blocking read. EOF from client.\n"));
419 smb_read_error = READ_EOF;
424 if (fd == client_fd) {
425 /* Try and give an error message saying what client failed. */
426 DEBUG(0,("read_socket_with_timeout: client %s read error = %s.\n",
427 client_ip_string, strerror(errno) ));
429 DEBUG(0,("read_socket_with_timeout: read error = %s.\n", strerror(errno) ));
431 smb_read_error = READ_ERROR;
436 return((ssize_t)nread);
439 /* Most difficult - timeout read */
440 /* If this is ever called on a disk file and
441 mincnt is greater then the filesize then
442 system performance will suffer severely as
443 select always returns true on disk files */
445 /* Set initial timeout */
446 timeout.tv_sec = (time_t)(time_out / 1000);
447 timeout.tv_usec = (long)(1000 * (time_out % 1000));
449 for (nread=0; nread < mincnt; ) {
453 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
457 /* something is wrong. Maybe the socket is dead? */
458 if (fd == client_fd) {
459 /* Try and give an error message saying what client failed. */
460 DEBUG(0,("read_socket_with_timeout: timeout read for client %s. select error = %s.\n",
461 client_ip_string, strerror(errno) ));
463 DEBUG(0,("read_socket_with_timeout: timeout read. select error = %s.\n", strerror(errno) ));
465 smb_read_error = READ_ERROR;
469 /* Did we timeout ? */
471 DEBUG(10,("read_socket_with_timeout: timeout read. select timed out.\n"));
472 smb_read_error = READ_TIMEOUT;
476 readret = sys_read(fd, buf+nread, maxcnt-nread);
479 /* we got EOF on the file descriptor */
480 DEBUG(5,("read_socket_with_timeout: timeout read. EOF from client.\n"));
481 smb_read_error = READ_EOF;
486 /* the descriptor is probably dead */
487 if (fd == client_fd) {
488 /* Try and give an error message saying what client failed. */
489 DEBUG(0,("read_socket_with_timeout: timeout read to client %s. read error = %s.\n",
490 client_ip_string, strerror(errno) ));
492 DEBUG(0,("read_socket_with_timeout: timeout read. read error = %s.\n", strerror(errno) ));
494 smb_read_error = READ_ERROR;
501 /* Return the number we got */
502 return (ssize_t)nread;
505 /****************************************************************************
506 Read data from the client, reading exactly N bytes.
507 ****************************************************************************/
509 ssize_t read_data(int fd,char *buffer,size_t N)
517 ret = sys_read(fd,buffer + total,N - total);
520 DEBUG(10,("read_data: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
521 smb_read_error = READ_EOF;
526 if (fd == client_fd) {
527 /* Try and give an error message saying what client failed. */
528 DEBUG(0,("read_data: read failure for %d bytes to client %s. Error = %s\n",
529 (int)(N - total), client_ip_string, strerror(errno) ));
531 DEBUG(0,("read_data: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
533 smb_read_error = READ_ERROR;
538 return (ssize_t)total;
541 /****************************************************************************
543 ****************************************************************************/
545 ssize_t write_data(int fd, const char *buffer, size_t N)
551 ret = sys_write(fd,buffer + total,N - total);
554 if (fd == client_fd) {
555 /* Try and give an error message saying what client failed. */
556 DEBUG(0,("write_data: write failure in writing to client %s. Error %s\n",
557 client_ip_string, strerror(errno) ));
559 DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) ));
570 return (ssize_t)total;
573 /****************************************************************************
574 Send a keepalive packet (rfc1002).
575 ****************************************************************************/
577 BOOL send_keepalive(int client)
579 unsigned char buf[4];
581 buf[0] = SMBkeepalive;
582 buf[1] = buf[2] = buf[3] = 0;
584 return(write_data(client,(char *)buf,4) == 4);
588 /****************************************************************************
589 Read 4 bytes of a smb packet and return the smb length of the packet.
590 Store the result in the buffer.
591 This version of the function will return a length of zero on receiving
593 Timeout is in milliseconds.
594 ****************************************************************************/
596 static ssize_t read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout)
604 ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout) == 4);
606 ok = (read_data(fd,inbuf,4) == 4);
611 len = smb_len(inbuf);
612 msg_type = CVAL(inbuf,0);
614 if (msg_type == SMBkeepalive)
615 DEBUG(5,("Got keepalive packet\n"));
618 DEBUG(10,("got smb length of %lu\n",(unsigned long)len));
623 /****************************************************************************
624 Read 4 bytes of a smb packet and return the smb length of the packet.
625 Store the result in the buffer. This version of the function will
626 never return a session keepalive (length of zero).
627 Timeout is in milliseconds.
628 ****************************************************************************/
630 ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
635 len = read_smb_length_return_keepalive(fd, inbuf, timeout);
640 /* Ignore session keepalives. */
641 if(CVAL(inbuf,0) != SMBkeepalive)
645 DEBUG(10,("read_smb_length: got smb length of %lu\n",
646 (unsigned long)len));
651 /****************************************************************************
652 Read an smb from a fd. Note that the buffer *MUST* be of size
653 BUFFER_SIZE+SAFETY_MARGIN.
654 The timeout is in milliseconds.
655 This function will return on receipt of a session keepalive packet.
656 Doesn't check the MAC on signed packets.
657 ****************************************************************************/
659 BOOL receive_smb_raw(int fd, char *buffer, unsigned int timeout)
665 memset(buffer,'\0',smb_size + 100);
667 len = read_smb_length_return_keepalive(fd,buffer,timeout);
669 DEBUG(10,("receive_smb_raw: length < 0!\n"));
672 * Correct fix. smb_read_error may have already been
673 * set. Only set it here if not already set. Global
674 * variables still suck :-). JRA.
677 if (smb_read_error == 0)
678 smb_read_error = READ_ERROR;
683 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
684 * of header. Don't print the error if this fits.... JRA.
687 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
688 DEBUG(0,("Invalid packet length! (%lu bytes).\n",(unsigned long)len));
689 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
692 * Correct fix. smb_read_error may have already been
693 * set. Only set it here if not already set. Global
694 * variables still suck :-). JRA.
697 if (smb_read_error == 0)
698 smb_read_error = READ_ERROR;
705 ret = read_socket_with_timeout(fd,buffer+4,len,len,timeout);
707 ret = read_data(fd,buffer+4,len);
711 if (smb_read_error == 0)
712 smb_read_error = READ_ERROR;
716 /* not all of samba3 properly checks for packet-termination of strings. This
717 ensures that we don't run off into empty space. */
718 SSVAL(buffer+4,len, 0);
724 /****************************************************************************
725 Wrapper for receive_smb_raw().
726 Checks the MAC on signed packets.
727 ****************************************************************************/
729 BOOL receive_smb(int fd, char *buffer, unsigned int timeout)
731 if (!receive_smb_raw(fd, buffer, timeout)) {
735 /* Check the incoming SMB signature. */
736 if (!srv_check_sign_mac(buffer, True)) {
737 DEBUG(0, ("receive_smb: SMB Signature verification failed on incoming packet!\n"));
738 if (smb_read_error == 0)
739 smb_read_error = READ_BAD_SIG;
746 /****************************************************************************
748 ****************************************************************************/
750 BOOL send_smb(int fd, char *buffer)
756 /* Sign the outgoing packet if required. */
757 srv_calculate_sign_mac(buffer);
759 len = smb_len(buffer) + 4;
761 while (nwritten < len) {
762 ret = write_data(fd,buffer+nwritten,len - nwritten);
764 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
765 (int)len,(int)ret, strerror(errno) ));
774 /****************************************************************************
775 Open a socket of the specified type, port, and address for incoming data.
776 ****************************************************************************/
778 int open_socket_in( int type, int port, int dlevel, uint32 socket_addr, BOOL rebind )
780 struct sockaddr_in sock;
783 memset( (char *)&sock, '\0', sizeof(sock) );
785 #ifdef HAVE_SOCK_SIN_LEN
786 sock.sin_len = sizeof(sock);
788 sock.sin_port = htons( port );
789 sock.sin_family = AF_INET;
790 sock.sin_addr.s_addr = socket_addr;
792 res = socket( AF_INET, type, 0 );
795 dbgtext( "open_socket_in(): socket() call failed: " );
796 dbgtext( "%s\n", strerror( errno ) );
801 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
803 int val = rebind ? 1 : 0;
804 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) == -1 ) {
805 if( DEBUGLVL( dlevel ) ) {
806 dbgtext( "open_socket_in(): setsockopt: " );
807 dbgtext( "SO_REUSEADDR = %s ", val?"True":"False" );
808 dbgtext( "on port %d failed ", port );
809 dbgtext( "with error = %s\n", strerror(errno) );
813 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) == -1 ) {
814 if( DEBUGLVL( dlevel ) ) {
815 dbgtext( "open_socket_in(): setsockopt: ");
816 dbgtext( "SO_REUSEPORT = %s ", val?"True":"False" );
817 dbgtext( "on port %d failed ", port );
818 dbgtext( "with error = %s\n", strerror(errno) );
821 #endif /* SO_REUSEPORT */
824 /* now we've got a socket - we need to bind it */
825 if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) {
826 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) {
827 dbgtext( "bind failed on port %d ", port );
828 dbgtext( "socket_addr = %s.\n", inet_ntoa( sock.sin_addr ) );
829 dbgtext( "Error = %s\n", strerror(errno) );
835 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
840 /****************************************************************************
841 Create an outgoing socket. timeout is in milliseconds.
842 **************************************************************************/
844 int open_socket_out(int type, struct in_addr *addr, int port ,int timeout)
846 struct sockaddr_in sock_out;
848 int connect_loop = 10;
851 /* create a socket to write to */
852 res = socket(PF_INET, type, 0);
854 DEBUG(0,("socket error (%s)\n", strerror(errno)));
858 if (type != SOCK_STREAM)
861 memset((char *)&sock_out,'\0',sizeof(sock_out));
862 putip((char *)&sock_out.sin_addr,(char *)addr);
864 sock_out.sin_port = htons( port );
865 sock_out.sin_family = PF_INET;
867 /* set it non-blocking */
868 set_blocking(res,False);
870 DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port));
872 /* and connect it to the destination */
875 ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));
877 /* Some systems return EAGAIN when they mean EINPROGRESS */
878 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
879 errno == EAGAIN) && (connect_loop < timeout) ) {
880 smb_msleep(connect_loop);
881 timeout -= connect_loop;
882 connect_loop += increment;
883 if (increment < 250) {
884 /* After 8 rounds we end up at a max of 255 msec */
890 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
892 DEBUG(1,("timeout connecting to %s:%d\n",inet_ntoa(*addr),port));
899 if (ret < 0 && errno == EISCONN) {
906 DEBUG(2,("error connecting to %s:%d (%s)\n",
907 inet_ntoa(*addr),port,strerror(errno)));
912 /* set it blocking again */
913 set_blocking(res,True);
918 /****************************************************************************
919 Create an outgoing TCP socket to any of the addrs. This is for
920 simultaneous connects to port 445 and 139 of a host or even a variety
921 of DC's all of which are equivalent for our purposes.
922 **************************************************************************/
924 BOOL open_any_socket_out(struct sockaddr_in *addrs, int num_addrs,
925 int timeout, int *fd_index, int *fd)
927 int i, resulting_index, res;
931 fd_set r_fds, wr_fds;
935 int connect_loop = 10000; /* 10 milliseconds */
937 timeout *= 1000; /* convert to microseconds */
939 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
944 resulting_index = -1;
946 for (i=0; i<num_addrs; i++)
949 for (i=0; i<num_addrs; i++) {
950 sockets[i] = socket(PF_INET, SOCK_STREAM, 0);
953 set_blocking(sockets[i], False);
957 good_connect = False;
959 for (i=0; i<num_addrs; i++) {
961 if (sockets[i] == -1)
964 if (connect(sockets[i], (struct sockaddr *)&(addrs[i]),
965 sizeof(*addrs)) == 0) {
966 /* Rather unlikely as we are non-blocking, but it
967 * might actually happen. */
972 if (errno == EINPROGRESS || errno == EALREADY ||
974 /* These are the error messages that something is
977 } else if (errno != 0) {
978 /* There was a direct error */
985 /* All of the connect's resulted in real error conditions */
989 /* Lets see if any of the connect attempts succeeded */
995 for (i=0; i<num_addrs; i++) {
996 if (sockets[i] == -1)
998 FD_SET(sockets[i], &wr_fds);
999 FD_SET(sockets[i], &r_fds);
1000 if (sockets[i]>maxfd)
1005 tv.tv_usec = connect_loop;
1007 res = sys_select(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1015 for (i=0; i<num_addrs; i++) {
1017 if (sockets[i] == -1)
1020 /* Stevens, Network Programming says that if there's a
1021 * successful connect, the socket is only writable. Upon an
1022 * error, it's both readable and writable. */
1024 if (FD_ISSET(sockets[i], &r_fds) &&
1025 FD_ISSET(sockets[i], &wr_fds)) {
1026 /* readable and writable, so it's an error */
1032 if (!FD_ISSET(sockets[i], &r_fds) &&
1033 FD_ISSET(sockets[i], &wr_fds)) {
1034 /* Only writable, so it's connected */
1035 resulting_index = i;
1042 timeout -= connect_loop;
1045 connect_loop *= 1.5;
1046 if (connect_loop > timeout)
1047 connect_loop = timeout;
1051 for (i=0; i<num_addrs; i++) {
1052 if (i == resulting_index)
1054 if (sockets[i] >= 0)
1058 if (resulting_index >= 0) {
1059 *fd_index = resulting_index;
1060 *fd = sockets[*fd_index];
1061 set_blocking(*fd, True);
1066 return (resulting_index >= 0);
1068 /****************************************************************************
1069 Open a connected UDP socket to host on port
1070 **************************************************************************/
1072 int open_udp_socket(const char *host, int port)
1074 int type = SOCK_DGRAM;
1075 struct sockaddr_in sock_out;
1077 struct in_addr *addr;
1079 addr = interpret_addr2(host);
1081 res = socket(PF_INET, type, 0);
1086 memset((char *)&sock_out,'\0',sizeof(sock_out));
1087 putip((char *)&sock_out.sin_addr,(char *)addr);
1088 sock_out.sin_port = htons(port);
1089 sock_out.sin_family = PF_INET;
1091 if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
1100 /*******************************************************************
1101 Matchname - determine if host name matches IP address. Used to
1102 confirm a hostname lookup to prevent spoof attacks.
1103 ******************************************************************/
1105 static BOOL matchname(char *remotehost,struct in_addr addr)
1110 if ((hp = sys_gethostbyname(remotehost)) == 0) {
1111 DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n", remotehost));
1116 * Make sure that gethostbyname() returns the "correct" host name.
1117 * Unfortunately, gethostbyname("localhost") sometimes yields
1118 * "localhost.domain". Since the latter host name comes from the
1119 * local DNS, we just have to trust it (all bets are off if the local
1120 * DNS is perverted). We always check the address list, though.
1123 if (!strequal(remotehost, hp->h_name)
1124 && !strequal(remotehost, "localhost")) {
1125 DEBUG(0,("host name/name mismatch: %s != %s\n",
1126 remotehost, hp->h_name));
1130 /* Look up the host address in the address list we just got. */
1131 for (i = 0; hp->h_addr_list[i]; i++) {
1132 if (memcmp(hp->h_addr_list[i], (char *) & addr, sizeof(addr)) == 0)
1137 * The host name does not map to the original host address. Perhaps
1138 * someone has compromised a name server. More likely someone botched
1139 * it, but that could be dangerous, too.
1142 DEBUG(0,("host name/address mismatch: %s != %s\n",
1143 inet_ntoa(addr), hp->h_name));
1147 /*******************************************************************
1148 Return the DNS name of the remote end of a socket.
1149 ******************************************************************/
1151 char *get_peer_name(int fd, BOOL force_lookup)
1153 static pstring name_buf;
1155 static fstring addr_buf;
1157 struct in_addr addr;
1160 /* reverse lookups can be *very* expensive, and in many
1161 situations won't work because many networks don't link dhcp
1162 with dns. To avoid the delay we avoid the lookup if
1164 if (!lp_hostname_lookups() && (force_lookup == False)) {
1165 return get_peer_addr(fd);
1168 p = get_peer_addr(fd);
1170 /* it might be the same as the last one - save some DNS work */
1171 if (strcmp(p, addr_buf) == 0)
1174 pstrcpy(name_buf,"UNKNOWN");
1178 fstrcpy(addr_buf, p);
1180 addr = *interpret_addr2(p);
1182 /* Look up the remote host name. */
1183 if ((hp = gethostbyaddr((char *)&addr.s_addr, sizeof(addr.s_addr), AF_INET)) == 0) {
1184 DEBUG(1,("Gethostbyaddr failed for %s\n",p));
1185 pstrcpy(name_buf, p);
1187 pstrcpy(name_buf,(char *)hp->h_name);
1188 if (!matchname(name_buf, addr)) {
1189 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1190 pstrcpy(name_buf,"UNKNOWN");
1194 /* can't pass the same source and dest strings in when you
1195 use --enable-developer or the clobber_region() call will
1198 pstrcpy( tmp_name, name_buf );
1199 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1200 if (strstr(name_buf,"..")) {
1201 pstrcpy(name_buf, "UNKNOWN");
1207 /*******************************************************************
1208 Return the IP addr of the remote end of a socket as a string.
1209 ******************************************************************/
1211 char *get_peer_addr(int fd)
1214 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
1215 socklen_t length = sizeof(sa);
1216 static fstring addr_buf;
1218 fstrcpy(addr_buf,"0.0.0.0");
1224 if (getpeername(fd, &sa, &length) < 0) {
1225 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
1229 fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
1234 /*******************************************************************
1235 Create protected unix domain socket.
1237 Some unixes cannot set permissions on a ux-dom-sock, so we
1238 have to make sure that the directory contains the protection
1239 permissions instead.
1240 ******************************************************************/
1242 int create_pipe_sock(const char *socket_dir,
1243 const char *socket_name,
1246 #ifdef HAVE_UNIXSOCKET
1247 struct sockaddr_un sunaddr;
1253 old_umask = umask(0);
1255 /* Create the socket directory or reuse the existing one */
1257 if (lstat(socket_dir, &st) == -1) {
1258 if (errno == ENOENT) {
1259 /* Create directory */
1260 if (mkdir(socket_dir, dir_perms) == -1) {
1261 DEBUG(0, ("error creating socket directory "
1262 "%s: %s\n", socket_dir,
1267 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1268 socket_dir, strerror(errno)));
1272 /* Check ownership and permission on existing directory */
1273 if (!S_ISDIR(st.st_mode)) {
1274 DEBUG(0, ("socket directory %s isn't a directory\n",
1278 if ((st.st_uid != sec_initial_uid()) ||
1279 ((st.st_mode & 0777) != dir_perms)) {
1280 DEBUG(0, ("invalid permissions on socket directory "
1281 "%s\n", socket_dir));
1286 /* Create the socket file */
1288 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1295 pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
1298 memset(&sunaddr, 0, sizeof(sunaddr));
1299 sunaddr.sun_family = AF_UNIX;
1300 safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
1302 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1303 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1308 if (listen(sock, 5) == -1) {
1309 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1325 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1327 #endif /* HAVE_UNIXSOCKET */