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 3 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, see <http://www.gnu.org/licenses/>.
24 /* the following 3 client_*() functions are nasty ways of allowing
25 some generic functions to get info that really should be hidden in
27 static int client_fd = -1;
28 /* What to print out on a client disconnect error. */
29 static char client_ip_string[16];
31 void client_setfd(int fd)
34 safe_strcpy(client_ip_string, get_peer_addr(client_fd), sizeof(client_ip_string)-1);
37 static char *get_socket_addr(int fd)
40 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
41 socklen_t length = sizeof(sa);
42 static fstring addr_buf;
44 fstrcpy(addr_buf,"0.0.0.0");
50 if (getsockname(fd, &sa, &length) < 0) {
51 DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) ));
55 fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
60 static int get_socket_port(int fd)
63 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
64 socklen_t length = sizeof(sa);
69 if (getsockname(fd, &sa, &length) < 0) {
70 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
74 return ntohs(sockin->sin_port);
77 char *client_name(void)
79 return get_peer_name(client_fd,False);
82 char *client_addr(void)
84 return get_peer_addr(client_fd);
87 char *client_socket_addr(void)
89 return get_socket_addr(client_fd);
92 int client_socket_port(void)
94 return get_socket_port(client_fd);
97 struct in_addr *client_inaddr(struct sockaddr *sa)
99 struct sockaddr_in *sockin = (struct sockaddr_in *) (sa);
100 socklen_t length = sizeof(*sa);
102 if (getpeername(client_fd, sa, &length) < 0) {
103 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
107 return &sockin->sin_addr;
110 /* the last IP received from */
111 struct in_addr lastip;
113 /* the last port received from */
116 int smb_read_error = 0;
118 /****************************************************************************
119 Determine if a file descriptor is in fact a socket.
120 ****************************************************************************/
122 BOOL is_a_socket(int fd)
127 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
130 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
132 typedef struct smb_socket_option {
140 static const smb_socket_option socket_options[] = {
141 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
142 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
143 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
145 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
148 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
151 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
154 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
156 #ifdef IPTOS_LOWDELAY
157 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
159 #ifdef IPTOS_THROUGHPUT
160 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
163 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
166 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
169 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
172 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
175 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
178 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
181 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
184 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
188 /****************************************************************************
189 Print socket options.
190 ****************************************************************************/
192 static void print_socket_options(int s)
196 const smb_socket_option *p = &socket_options[0];
198 /* wrapped in if statement to prevent streams leak in SCO Openserver 5.0 */
199 /* reported on samba-technical --jerry */
200 if ( DEBUGLEVEL >= 5 ) {
201 for (; p->name != NULL; p++) {
202 if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) {
203 DEBUG(5,("Could not test socket option %s.\n", p->name));
205 DEBUG(5,("socket option %s = %d\n",p->name,value));
211 /****************************************************************************
212 Set user socket options.
213 ****************************************************************************/
215 void set_socket_options(int fd, const char *options)
219 while (next_token(&options,tok," \t,", sizeof(tok))) {
223 BOOL got_value = False;
225 if ((p = strchr_m(tok,'='))) {
231 for (i=0;socket_options[i].name;i++)
232 if (strequal(socket_options[i].name,tok))
235 if (!socket_options[i].name) {
236 DEBUG(0,("Unknown socket option %s\n",tok));
240 switch (socket_options[i].opttype) {
243 ret = setsockopt(fd,socket_options[i].level,
244 socket_options[i].option,(char *)&value,sizeof(int));
249 DEBUG(0,("syntax error - %s does not take a value\n",tok));
252 int on = socket_options[i].value;
253 ret = setsockopt(fd,socket_options[i].level,
254 socket_options[i].option,(char *)&on,sizeof(int));
260 DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) ));
263 print_socket_options(fd);
266 /****************************************************************************
268 ****************************************************************************/
270 ssize_t read_udp_socket(int fd,char *buf,size_t len)
273 struct sockaddr_in sock;
274 socklen_t socklen = sizeof(sock);
276 memset((char *)&sock,'\0',socklen);
277 memset((char *)&lastip,'\0',sizeof(lastip));
278 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,(struct sockaddr *)&sock,&socklen);
280 /* Don't print a low debug error for a non-blocking socket. */
281 if (errno == EAGAIN) {
282 DEBUG(10,("read socket returned EAGAIN. ERRNO=%s\n",strerror(errno)));
284 DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno)));
289 lastip = sock.sin_addr;
290 lastport = ntohs(sock.sin_port);
292 DEBUG(10,("read_udp_socket: lastip %s lastport %d read: %lu\n",
293 inet_ntoa(lastip), lastport, (unsigned long)ret));
300 Socket routines from HEAD - maybe re-enable in future. JRA.
302 /****************************************************************************
303 Work out if we've timed out.
304 ****************************************************************************/
306 static BOOL timeout_until(struct timeval *timeout, const struct timeval *endtime)
313 t_dif = usec_time_diff(endtime, &now);
318 timeout->tv_sec = (t_dif / (SMB_BIG_INT)1000000);
319 timeout->tv_usec = (t_dif % (SMB_BIG_INT)1000000);
323 /****************************************************************************
324 Read data from the client, reading exactly N bytes, or until endtime timeout.
325 Use with a non-blocking socket if endtime != NULL.
326 ****************************************************************************/
328 ssize_t read_data_until(int fd,char *buffer,size_t N, const struct timeval *endtime)
337 if (endtime != NULL) {
339 struct timeval timeout;
342 if (!timeout_until(&timeout, endtime)) {
343 DEBUG(10,("read_data_until: read timed out\n"));
344 smb_read_error = READ_TIMEOUT;
351 /* Select but ignore EINTR. */
352 selrtn = sys_select_intr(fd+1, &r_fds, NULL, NULL, &timeout);
354 /* something is wrong. Maybe the socket is dead? */
355 DEBUG(0,("read_data_until: select error = %s.\n", strerror(errno) ));
356 smb_read_error = READ_ERROR;
360 /* Did we timeout ? */
362 DEBUG(10,("read_data_until: select timed out.\n"));
363 smb_read_error = READ_TIMEOUT;
368 ret = sys_read(fd,buffer + total,N - total);
371 DEBUG(10,("read_data_until: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
372 smb_read_error = READ_EOF;
377 if (errno == EAGAIN) {
378 /* Non-blocking socket with no data available. Try select again. */
381 DEBUG(0,("read_data_until: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
382 smb_read_error = READ_ERROR;
387 return (ssize_t)total;
391 /****************************************************************************
392 Read data from a socket with a timout in msec.
393 mincount = if timeout, minimum to read before returning
394 maxcount = number to be read.
395 time_out = timeout in milliseconds
396 ****************************************************************************/
398 ssize_t read_socket_with_timeout(int fd,char *buf,size_t mincnt,size_t maxcnt,unsigned int time_out)
404 struct timeval timeout;
406 /* just checking .... */
418 while (nread < mincnt) {
419 readret = sys_read(fd, buf + nread, maxcnt - nread);
422 DEBUG(5,("read_socket_with_timeout: blocking read. EOF from client.\n"));
423 smb_read_error = READ_EOF;
428 if (fd == client_fd) {
429 /* Try and give an error message saying what client failed. */
430 DEBUG(0,("read_socket_with_timeout: client %s read error = %s.\n",
431 client_ip_string, strerror(errno) ));
433 DEBUG(0,("read_socket_with_timeout: read error = %s.\n", strerror(errno) ));
435 smb_read_error = READ_ERROR;
440 return((ssize_t)nread);
443 /* Most difficult - timeout read */
444 /* If this is ever called on a disk file and
445 mincnt is greater then the filesize then
446 system performance will suffer severely as
447 select always returns true on disk files */
449 /* Set initial timeout */
450 timeout.tv_sec = (time_t)(time_out / 1000);
451 timeout.tv_usec = (long)(1000 * (time_out % 1000));
453 for (nread=0; nread < mincnt; ) {
457 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
461 /* something is wrong. Maybe the socket is dead? */
462 if (fd == client_fd) {
463 /* Try and give an error message saying what client failed. */
464 DEBUG(0,("read_socket_with_timeout: timeout read for client %s. select error = %s.\n",
465 client_ip_string, strerror(errno) ));
467 DEBUG(0,("read_socket_with_timeout: timeout read. select error = %s.\n", strerror(errno) ));
469 smb_read_error = READ_ERROR;
473 /* Did we timeout ? */
475 DEBUG(10,("read_socket_with_timeout: timeout read. select timed out.\n"));
476 smb_read_error = READ_TIMEOUT;
480 readret = sys_read(fd, buf+nread, maxcnt-nread);
483 /* we got EOF on the file descriptor */
484 DEBUG(5,("read_socket_with_timeout: timeout read. EOF from client.\n"));
485 smb_read_error = READ_EOF;
490 /* the descriptor is probably dead */
491 if (fd == client_fd) {
492 /* Try and give an error message saying what client failed. */
493 DEBUG(0,("read_socket_with_timeout: timeout read to client %s. read error = %s.\n",
494 client_ip_string, strerror(errno) ));
496 DEBUG(0,("read_socket_with_timeout: timeout read. read error = %s.\n", strerror(errno) ));
498 smb_read_error = READ_ERROR;
505 /* Return the number we got */
506 return (ssize_t)nread;
509 /****************************************************************************
510 Read data from the client, reading exactly N bytes.
511 ****************************************************************************/
513 ssize_t read_data(int fd,char *buffer,size_t N)
521 ret = sys_read(fd,buffer + total,N - total);
524 DEBUG(10,("read_data: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
525 smb_read_error = READ_EOF;
530 if (fd == client_fd) {
531 /* Try and give an error message saying what client failed. */
532 DEBUG(0,("read_data: read failure for %d bytes to client %s. Error = %s\n",
533 (int)(N - total), client_ip_string, strerror(errno) ));
535 DEBUG(0,("read_data: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
537 smb_read_error = READ_ERROR;
542 return (ssize_t)total;
545 /****************************************************************************
547 ****************************************************************************/
549 ssize_t write_data(int fd, const char *buffer, size_t N)
555 ret = sys_write(fd,buffer + total,N - total);
558 if (fd == client_fd) {
559 /* Try and give an error message saying what client failed. */
560 DEBUG(0,("write_data: write failure in writing to client %s. Error %s\n",
561 client_ip_string, strerror(errno) ));
563 DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) ));
574 return (ssize_t)total;
577 /****************************************************************************
578 Send a keepalive packet (rfc1002).
579 ****************************************************************************/
581 BOOL send_keepalive(int client)
583 unsigned char buf[4];
585 buf[0] = SMBkeepalive;
586 buf[1] = buf[2] = buf[3] = 0;
588 return(write_data(client,(char *)buf,4) == 4);
592 /****************************************************************************
593 Read 4 bytes of a smb packet and return the smb length of the packet.
594 Store the result in the buffer.
595 This version of the function will return a length of zero on receiving
597 Timeout is in milliseconds.
598 ****************************************************************************/
600 static ssize_t read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout)
608 ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout) == 4);
610 ok = (read_data(fd,inbuf,4) == 4);
615 len = smb_len(inbuf);
616 msg_type = CVAL(inbuf,0);
618 if (msg_type == SMBkeepalive)
619 DEBUG(5,("Got keepalive packet\n"));
622 DEBUG(10,("got smb length of %lu\n",(unsigned long)len));
627 /****************************************************************************
628 Read 4 bytes of a smb packet and return the smb length of the packet.
629 Store the result in the buffer. This version of the function will
630 never return a session keepalive (length of zero).
631 Timeout is in milliseconds.
632 ****************************************************************************/
634 ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
639 len = read_smb_length_return_keepalive(fd, inbuf, timeout);
644 /* Ignore session keepalives. */
645 if(CVAL(inbuf,0) != SMBkeepalive)
649 DEBUG(10,("read_smb_length: got smb length of %lu\n",
650 (unsigned long)len));
655 /****************************************************************************
656 Read an smb from a fd. Note that the buffer *MUST* be of size
657 BUFFER_SIZE+SAFETY_MARGIN.
658 The timeout is in milliseconds.
659 This function will return on receipt of a session keepalive packet.
660 maxlen is the max number of bytes to return, not including the 4 byte
661 length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit.
662 Doesn't check the MAC on signed packets.
663 ****************************************************************************/
665 ssize_t receive_smb_raw(int fd, char *buffer, unsigned int timeout, size_t maxlen)
671 len = read_smb_length_return_keepalive(fd,buffer,timeout);
673 DEBUG(10,("receive_smb_raw: length < 0!\n"));
676 * Correct fix. smb_read_error may have already been
677 * set. Only set it here if not already set. Global
678 * variables still suck :-). JRA.
681 if (smb_read_error == 0)
682 smb_read_error = READ_ERROR;
687 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
688 * of header. Don't print the error if this fits.... JRA.
691 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
692 DEBUG(0,("Invalid packet length! (%lu bytes).\n",(unsigned long)len));
693 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
696 * Correct fix. smb_read_error may have already been
697 * set. Only set it here if not already set. Global
698 * variables still suck :-). JRA.
701 if (smb_read_error == 0)
702 smb_read_error = READ_ERROR;
709 len = MIN(len,maxlen);
713 ret = read_socket_with_timeout(fd,buffer+4,len,len,timeout);
715 ret = read_data(fd,buffer+4,len);
719 if (smb_read_error == 0) {
720 smb_read_error = READ_ERROR;
725 /* not all of samba3 properly checks for packet-termination of strings. This
726 ensures that we don't run off into empty space. */
727 SSVAL(buffer+4,len, 0);
733 /****************************************************************************
734 Wrapper for receive_smb_raw().
735 Checks the MAC on signed packets.
736 ****************************************************************************/
738 BOOL receive_smb(int fd, char *buffer, unsigned int timeout)
740 if (receive_smb_raw(fd, buffer, timeout, 0) < 0) {
744 if (srv_encryption_on()) {
745 NTSTATUS status = srv_decrypt_buffer(buffer);
746 if (!NT_STATUS_IS_OK(status)) {
747 DEBUG(0, ("receive_smb: SMB decryption failed on incoming packet! Error %s\n",
748 nt_errstr(status) ));
749 if (smb_read_error == 0) {
750 smb_read_error = READ_BAD_DECRYPT;
756 /* Check the incoming SMB signature. */
757 if (!srv_check_sign_mac(buffer, True)) {
758 DEBUG(0, ("receive_smb: SMB Signature verification failed on incoming packet!\n"));
759 if (smb_read_error == 0) {
760 smb_read_error = READ_BAD_SIG;
768 /****************************************************************************
770 ****************************************************************************/
772 BOOL send_smb(int fd, char *buffer)
777 char *buf_out = buffer;
779 /* Sign the outgoing packet if required. */
780 srv_calculate_sign_mac(buf_out);
782 if (srv_encryption_on()) {
783 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
784 if (!NT_STATUS_IS_OK(status)) {
785 DEBUG(0, ("send_smb: SMB encryption failed on outgoing packet! Error %s\n",
786 nt_errstr(status) ));
791 len = smb_len(buf_out) + 4;
793 while (nwritten < len) {
794 ret = write_data(fd,buf_out+nwritten,len - nwritten);
796 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
797 (int)len,(int)ret, strerror(errno) ));
798 srv_free_enc_buffer(buf_out);
804 srv_free_enc_buffer(buf_out);
808 /****************************************************************************
809 Open a socket of the specified type, port, and address for incoming data.
810 ****************************************************************************/
812 int open_socket_in( int type, int port, int dlevel, uint32 socket_addr, BOOL rebind )
814 struct sockaddr_in sock;
817 memset( (char *)&sock, '\0', sizeof(sock) );
819 #ifdef HAVE_SOCK_SIN_LEN
820 sock.sin_len = sizeof(sock);
822 sock.sin_port = htons( port );
823 sock.sin_family = AF_INET;
824 sock.sin_addr.s_addr = socket_addr;
826 res = socket( AF_INET, type, 0 );
829 dbgtext( "open_socket_in(): socket() call failed: " );
830 dbgtext( "%s\n", strerror( errno ) );
835 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
837 int val = rebind ? 1 : 0;
838 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) == -1 ) {
839 if( DEBUGLVL( dlevel ) ) {
840 dbgtext( "open_socket_in(): setsockopt: " );
841 dbgtext( "SO_REUSEADDR = %s ", val?"True":"False" );
842 dbgtext( "on port %d failed ", port );
843 dbgtext( "with error = %s\n", strerror(errno) );
847 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) == -1 ) {
848 if( DEBUGLVL( dlevel ) ) {
849 dbgtext( "open_socket_in(): setsockopt: ");
850 dbgtext( "SO_REUSEPORT = %s ", val?"True":"False" );
851 dbgtext( "on port %d failed ", port );
852 dbgtext( "with error = %s\n", strerror(errno) );
855 #endif /* SO_REUSEPORT */
858 /* now we've got a socket - we need to bind it */
859 if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) {
860 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) {
861 dbgtext( "bind failed on port %d ", port );
862 dbgtext( "socket_addr = %s.\n", inet_ntoa( sock.sin_addr ) );
863 dbgtext( "Error = %s\n", strerror(errno) );
869 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
874 /****************************************************************************
875 Create an outgoing socket. timeout is in milliseconds.
876 **************************************************************************/
878 int open_socket_out(int type, struct in_addr *addr, int port ,int timeout)
880 struct sockaddr_in sock_out;
882 int connect_loop = 10;
885 /* create a socket to write to */
886 res = socket(PF_INET, type, 0);
888 DEBUG(0,("socket error (%s)\n", strerror(errno)));
892 if (type != SOCK_STREAM)
895 memset((char *)&sock_out,'\0',sizeof(sock_out));
896 putip((char *)&sock_out.sin_addr,(char *)addr);
898 sock_out.sin_port = htons( port );
899 sock_out.sin_family = PF_INET;
901 /* set it non-blocking */
902 set_blocking(res,False);
904 DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port));
906 /* and connect it to the destination */
909 ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));
911 /* Some systems return EAGAIN when they mean EINPROGRESS */
912 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
913 errno == EAGAIN) && (connect_loop < timeout) ) {
914 smb_msleep(connect_loop);
915 timeout -= connect_loop;
916 connect_loop += increment;
917 if (increment < 250) {
918 /* After 8 rounds we end up at a max of 255 msec */
924 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
926 DEBUG(1,("timeout connecting to %s:%d\n",inet_ntoa(*addr),port));
933 if (ret < 0 && errno == EISCONN) {
940 DEBUG(2,("error connecting to %s:%d (%s)\n",
941 inet_ntoa(*addr),port,strerror(errno)));
946 /* set it blocking again */
947 set_blocking(res,True);
952 /****************************************************************************
953 Create an outgoing TCP socket to any of the addrs. This is for
954 simultaneous connects to port 445 and 139 of a host or even a variety
955 of DC's all of which are equivalent for our purposes.
956 **************************************************************************/
958 BOOL open_any_socket_out(struct sockaddr_in *addrs, int num_addrs,
959 int timeout, int *fd_index, int *fd)
961 int i, resulting_index, res;
965 fd_set r_fds, wr_fds;
969 int connect_loop = 10000; /* 10 milliseconds */
971 timeout *= 1000; /* convert to microseconds */
973 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
978 resulting_index = -1;
980 for (i=0; i<num_addrs; i++)
983 for (i=0; i<num_addrs; i++) {
984 sockets[i] = socket(PF_INET, SOCK_STREAM, 0);
987 set_blocking(sockets[i], False);
991 good_connect = False;
993 for (i=0; i<num_addrs; i++) {
995 if (sockets[i] == -1)
998 if (connect(sockets[i], (struct sockaddr *)&(addrs[i]),
999 sizeof(*addrs)) == 0) {
1000 /* Rather unlikely as we are non-blocking, but it
1001 * might actually happen. */
1002 resulting_index = i;
1006 if (errno == EINPROGRESS || errno == EALREADY ||
1010 errno == EAGAIN || errno == EINTR) {
1011 /* These are the error messages that something is
1013 good_connect = True;
1014 } else if (errno != 0) {
1015 /* There was a direct error */
1021 if (!good_connect) {
1022 /* All of the connect's resulted in real error conditions */
1026 /* Lets see if any of the connect attempts succeeded */
1032 for (i=0; i<num_addrs; i++) {
1033 if (sockets[i] == -1)
1035 FD_SET(sockets[i], &wr_fds);
1036 FD_SET(sockets[i], &r_fds);
1037 if (sockets[i]>maxfd)
1042 tv.tv_usec = connect_loop;
1044 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1052 for (i=0; i<num_addrs; i++) {
1054 if (sockets[i] == -1)
1057 /* Stevens, Network Programming says that if there's a
1058 * successful connect, the socket is only writable. Upon an
1059 * error, it's both readable and writable. */
1061 if (FD_ISSET(sockets[i], &r_fds) &&
1062 FD_ISSET(sockets[i], &wr_fds)) {
1063 /* readable and writable, so it's an error */
1069 if (!FD_ISSET(sockets[i], &r_fds) &&
1070 FD_ISSET(sockets[i], &wr_fds)) {
1071 /* Only writable, so it's connected */
1072 resulting_index = i;
1079 timeout -= connect_loop;
1082 connect_loop *= 1.5;
1083 if (connect_loop > timeout)
1084 connect_loop = timeout;
1088 for (i=0; i<num_addrs; i++) {
1089 if (i == resulting_index)
1091 if (sockets[i] >= 0)
1095 if (resulting_index >= 0) {
1096 *fd_index = resulting_index;
1097 *fd = sockets[*fd_index];
1098 set_blocking(*fd, True);
1103 return (resulting_index >= 0);
1105 /****************************************************************************
1106 Open a connected UDP socket to host on port
1107 **************************************************************************/
1109 int open_udp_socket(const char *host, int port)
1111 int type = SOCK_DGRAM;
1112 struct sockaddr_in sock_out;
1114 struct in_addr *addr;
1116 addr = interpret_addr2(host);
1118 res = socket(PF_INET, type, 0);
1123 memset((char *)&sock_out,'\0',sizeof(sock_out));
1124 putip((char *)&sock_out.sin_addr,(char *)addr);
1125 sock_out.sin_port = htons(port);
1126 sock_out.sin_family = PF_INET;
1128 if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
1137 /*******************************************************************
1138 Matchname - determine if host name matches IP address. Used to
1139 confirm a hostname lookup to prevent spoof attacks.
1140 ******************************************************************/
1142 static BOOL matchname(char *remotehost,struct in_addr addr)
1147 if ((hp = sys_gethostbyname(remotehost)) == 0) {
1148 DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n", remotehost));
1153 * Make sure that gethostbyname() returns the "correct" host name.
1154 * Unfortunately, gethostbyname("localhost") sometimes yields
1155 * "localhost.domain". Since the latter host name comes from the
1156 * local DNS, we just have to trust it (all bets are off if the local
1157 * DNS is perverted). We always check the address list, though.
1160 if (!strequal(remotehost, hp->h_name)
1161 && !strequal(remotehost, "localhost")) {
1162 DEBUG(0,("host name/name mismatch: %s != %s\n",
1163 remotehost, hp->h_name));
1167 /* Look up the host address in the address list we just got. */
1168 for (i = 0; hp->h_addr_list[i]; i++) {
1169 if (memcmp(hp->h_addr_list[i], (char *) & addr, sizeof(addr)) == 0)
1174 * The host name does not map to the original host address. Perhaps
1175 * someone has compromised a name server. More likely someone botched
1176 * it, but that could be dangerous, too.
1179 DEBUG(0,("host name/address mismatch: %s != %s\n",
1180 inet_ntoa(addr), hp->h_name));
1184 /*******************************************************************
1185 Return the DNS name of the remote end of a socket.
1186 ******************************************************************/
1188 char *get_peer_name(int fd, BOOL force_lookup)
1190 static pstring name_buf;
1192 static fstring addr_buf;
1194 struct in_addr addr;
1197 /* reverse lookups can be *very* expensive, and in many
1198 situations won't work because many networks don't link dhcp
1199 with dns. To avoid the delay we avoid the lookup if
1201 if (!lp_hostname_lookups() && (force_lookup == False)) {
1202 return get_peer_addr(fd);
1205 p = get_peer_addr(fd);
1207 /* it might be the same as the last one - save some DNS work */
1208 if (strcmp(p, addr_buf) == 0)
1211 pstrcpy(name_buf,"UNKNOWN");
1215 fstrcpy(addr_buf, p);
1217 addr = *interpret_addr2(p);
1219 /* Look up the remote host name. */
1220 if ((hp = gethostbyaddr((char *)&addr.s_addr, sizeof(addr.s_addr), AF_INET)) == 0) {
1221 DEBUG(1,("Gethostbyaddr failed for %s\n",p));
1222 pstrcpy(name_buf, p);
1224 pstrcpy(name_buf,(char *)hp->h_name);
1225 if (!matchname(name_buf, addr)) {
1226 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1227 pstrcpy(name_buf,"UNKNOWN");
1231 /* can't pass the same source and dest strings in when you
1232 use --enable-developer or the clobber_region() call will
1235 pstrcpy( tmp_name, name_buf );
1236 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1237 if (strstr(name_buf,"..")) {
1238 pstrcpy(name_buf, "UNKNOWN");
1244 /*******************************************************************
1245 Return the IP addr of the remote end of a socket as a string.
1246 ******************************************************************/
1248 char *get_peer_addr(int fd)
1251 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
1252 socklen_t length = sizeof(sa);
1253 static fstring addr_buf;
1255 fstrcpy(addr_buf,"0.0.0.0");
1261 if (getpeername(fd, &sa, &length) < 0) {
1262 DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
1266 fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
1271 /*******************************************************************
1272 Create protected unix domain socket.
1274 Some unixes cannot set permissions on a ux-dom-sock, so we
1275 have to make sure that the directory contains the protection
1276 permissions instead.
1277 ******************************************************************/
1279 int create_pipe_sock(const char *socket_dir,
1280 const char *socket_name,
1283 #ifdef HAVE_UNIXSOCKET
1284 struct sockaddr_un sunaddr;
1290 old_umask = umask(0);
1292 /* Create the socket directory or reuse the existing one */
1294 if (lstat(socket_dir, &st) == -1) {
1295 if (errno == ENOENT) {
1296 /* Create directory */
1297 if (mkdir(socket_dir, dir_perms) == -1) {
1298 DEBUG(0, ("error creating socket directory "
1299 "%s: %s\n", socket_dir,
1304 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1305 socket_dir, strerror(errno)));
1309 /* Check ownership and permission on existing directory */
1310 if (!S_ISDIR(st.st_mode)) {
1311 DEBUG(0, ("socket directory %s isn't a directory\n",
1315 if ((st.st_uid != sec_initial_uid()) ||
1316 ((st.st_mode & 0777) != dir_perms)) {
1317 DEBUG(0, ("invalid permissions on socket directory "
1318 "%s\n", socket_dir));
1323 /* Create the socket file */
1325 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1332 pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
1335 memset(&sunaddr, 0, sizeof(sunaddr));
1336 sunaddr.sun_family = AF_UNIX;
1337 safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
1339 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1340 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1345 if (listen(sock, 5) == -1) {
1346 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1362 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1364 #endif /* HAVE_UNIXSOCKET */