+/*
+ Unix SMB/CIFS implementation.
+ Samba utility functions
+ Copyright (C) Andrew Tridgell 1992-1998
+ Copyright (C) Tim Potter 2000-2001
+ Copyright (C) Jeremy Allison 1992-2005
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* the following 3 client_*() functions are nasty ways of allowing
+ some generic functions to get info that really should be hidden in
+ particular modules */
+static int client_fd = -1;
+/* What to print out on a client disconnect error. */
+static char client_ip_string[16];
+
+void client_setfd(int fd)
+{
+ client_fd = fd;
+ safe_strcpy(client_ip_string, get_peer_addr(client_fd), sizeof(client_ip_string)-1);
+}
+
+static char *get_socket_addr(int fd)
+{
+ struct sockaddr sa;
+ struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
+ socklen_t length = sizeof(sa);
+ static fstring addr_buf;
+
+ fstrcpy(addr_buf,"0.0.0.0");
+
+ if (fd == -1) {
+ return addr_buf;
+ }
+
+ if (getsockname(fd, &sa, &length) < 0) {
+ DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) ));
+ return addr_buf;
+ }
+
+ fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
+
+ return addr_buf;
+}
+
+static int get_socket_port(int fd)
+{
+ struct sockaddr sa;
+ struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
+ socklen_t length = sizeof(sa);
+
+ if (fd == -1)
+ return -1;
+
+ if (getsockname(fd, &sa, &length) < 0) {
+ DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
+ return -1;
+ }
+
+ return ntohs(sockin->sin_port);
+}
+
+char *client_name(void)
+{
+ return get_peer_name(client_fd,False);
+}
+
+char *client_addr(void)
+{
+ return get_peer_addr(client_fd);
+}
+
+char *client_socket_addr(void)
+{
+ return get_socket_addr(client_fd);
+}
+
+int client_socket_port(void)
+{
+ return get_socket_port(client_fd);
+}
+
+struct in_addr *client_inaddr(struct sockaddr *sa)
+{
+ struct sockaddr_in *sockin = (struct sockaddr_in *) (sa);
+ socklen_t length = sizeof(*sa);
+
+ if (getpeername(client_fd, sa, &length) < 0) {
+ DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
+ return NULL;
+ }
+
+ return &sockin->sin_addr;
+}
+
+/* the last IP received from */
+struct in_addr lastip;
+
+/* the last port received from */
+int lastport=0;
+
+int smb_read_error = 0;
+
+/****************************************************************************
+ Determine if a file descriptor is in fact a socket.
+****************************************************************************/
+
+BOOL is_a_socket(int fd)
+{
+ int v;
+ socklen_t l;
+ l = sizeof(int);
+ return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
+}
+
+enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
+
+typedef struct smb_socket_option {
+ const char *name;
+ int level;
+ int option;
+ int value;
+ int opttype;
+} smb_socket_option;
+
+static const smb_socket_option socket_options[] = {
+ {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
+ {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
+ {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
+#ifdef TCP_NODELAY
+ {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
+#endif
+#ifdef TCP_KEEPCNT
+ {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
+#endif
+#ifdef TCP_KEEPIDLE
+ {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
+#endif
+#ifdef TCP_KEEPINTVL
+ {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
+#endif
+#ifdef IPTOS_LOWDELAY
+ {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
+#endif
+#ifdef IPTOS_THROUGHPUT
+ {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
+#endif
+#ifdef SO_REUSEPORT
+ {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
+#endif
+#ifdef SO_SNDBUF
+ {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
+#endif
+#ifdef SO_RCVBUF
+ {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
+#endif
+#ifdef SO_SNDLOWAT
+ {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
+#endif
+#ifdef SO_RCVLOWAT
+ {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
+#endif
+#ifdef SO_SNDTIMEO
+ {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
+#endif
+#ifdef SO_RCVTIMEO
+ {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
+#endif
+#ifdef TCP_FASTACK
+ {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
+#endif
+ {NULL,0,0,0,0}};
+
+/****************************************************************************
+ Print socket options.
+****************************************************************************/
+
+static void print_socket_options(int s)
+{
+ int value;
+ socklen_t vlen = 4;
+ const smb_socket_option *p = &socket_options[0];
+
+ /* wrapped in if statement to prevent streams leak in SCO Openserver 5.0 */
+ /* reported on samba-technical --jerry */
+ if ( DEBUGLEVEL >= 5 ) {
+ for (; p->name != NULL; p++) {
+ if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) {
+ DEBUG(5,("Could not test socket option %s.\n", p->name));
+ } else {
+ DEBUG(5,("socket option %s = %d\n",p->name,value));
+ }
+ }
+ }
+ }
+
+/****************************************************************************
+ Set user socket options.
+****************************************************************************/
+
+void set_socket_options(int fd, const char *options)
+{
+ fstring tok;
+
+ while (next_token(&options,tok," \t,", sizeof(tok))) {
+ int ret=0,i;
+ int value = 1;
+ char *p;
+ BOOL got_value = False;
+
+ if ((p = strchr_m(tok,'='))) {
+ *p = 0;
+ value = atoi(p+1);
+ got_value = True;
+ }
+
+ for (i=0;socket_options[i].name;i++)
+ if (strequal(socket_options[i].name,tok))
+ break;
+
+ if (!socket_options[i].name) {
+ DEBUG(0,("Unknown socket option %s\n",tok));
+ continue;
+ }
+
+ switch (socket_options[i].opttype) {
+ case OPT_BOOL:
+ case OPT_INT:
+ ret = setsockopt(fd,socket_options[i].level,
+ socket_options[i].option,(char *)&value,sizeof(int));
+ break;
+
+ case OPT_ON:
+ if (got_value)
+ DEBUG(0,("syntax error - %s does not take a value\n",tok));
+
+ {
+ int on = socket_options[i].value;
+ ret = setsockopt(fd,socket_options[i].level,
+ socket_options[i].option,(char *)&on,sizeof(int));
+ }
+ break;
+ }
+
+ if (ret != 0)
+ DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) ));
+ }
+
+ print_socket_options(fd);
+}
+
+/****************************************************************************
+ Read from a socket.
+****************************************************************************/
+
+ssize_t read_udp_socket(int fd,char *buf,size_t len)
+{
+ ssize_t ret;
+ struct sockaddr_in sock;
+ socklen_t socklen = sizeof(sock);
+
+ memset((char *)&sock,'\0',socklen);
+ memset((char *)&lastip,'\0',sizeof(lastip));
+ ret = (ssize_t)sys_recvfrom(fd,buf,len,0,(struct sockaddr *)&sock,&socklen);
+ if (ret <= 0) {
+ DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno)));
+ return(0);
+ }
+
+ lastip = sock.sin_addr;
+ lastport = ntohs(sock.sin_port);
+
+ DEBUG(10,("read_udp_socket: lastip %s lastport %d read: %lu\n",
+ inet_ntoa(lastip), lastport, (unsigned long)ret));
+
+ return(ret);
+}
+
+#if 0
+
+Socket routines from HEAD - maybe re-enable in future. JRA.
+
+/****************************************************************************
+ Work out if we've timed out.
+****************************************************************************/
+
+static BOOL timeout_until(struct timeval *timeout, const struct timeval *endtime)
+{
+ struct timeval now;
+ SMB_BIG_INT t_dif;
+
+ GetTimeOfDay(&now);
+
+ t_dif = usec_time_diff(endtime, &now);
+ if (t_dif <= 0) {
+ return False;
+ }
+
+ timeout->tv_sec = (t_dif / (SMB_BIG_INT)1000000);
+ timeout->tv_usec = (t_dif % (SMB_BIG_INT)1000000);
+ return True;
+}
+
+/****************************************************************************
+ Read data from the client, reading exactly N bytes, or until endtime timeout.
+ Use with a non-blocking socket if endtime != NULL.
+****************************************************************************/
+
+ssize_t read_data_until(int fd,char *buffer,size_t N, const struct timeval *endtime)
+{
+ ssize_t ret;
+ size_t total=0;
+
+ smb_read_error = 0;
+
+ while (total < N) {
+
+ if (endtime != NULL) {
+ fd_set r_fds;
+ struct timeval timeout;
+ int selrtn;
+
+ if (!timeout_until(&timeout, endtime)) {
+ DEBUG(10,("read_data_until: read timed out\n"));
+ smb_read_error = READ_TIMEOUT;
+ return -1;
+ }
+
+ FD_ZERO(&r_fds);
+ FD_SET(fd, &r_fds);
+
+ /* Select but ignore EINTR. */
+ selrtn = sys_select_intr(fd+1, &r_fds, NULL, NULL, &timeout);
+ if (selrtn == -1) {
+ /* something is wrong. Maybe the socket is dead? */
+ DEBUG(0,("read_data_until: select error = %s.\n", strerror(errno) ));
+ smb_read_error = READ_ERROR;
+ return -1;
+ }
+
+ /* Did we timeout ? */
+ if (selrtn == 0) {
+ DEBUG(10,("read_data_until: select timed out.\n"));
+ smb_read_error = READ_TIMEOUT;
+ return -1;
+ }
+ }
+
+ ret = sys_read(fd,buffer + total,N - total);
+
+ if (ret == 0) {
+ DEBUG(10,("read_data_until: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
+ smb_read_error = READ_EOF;
+ return 0;
+ }
+
+ if (ret == -1) {
+ if (errno == EAGAIN) {
+ /* Non-blocking socket with no data available. Try select again. */
+ continue;
+ }
+ DEBUG(0,("read_data_until: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
+ smb_read_error = READ_ERROR;
+ return -1;
+ }
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+#endif
+
+/****************************************************************************
+ Read data from a socket with a timout in msec.
+ mincount = if timeout, minimum to read before returning
+ maxcount = number to be read.
+ time_out = timeout in milliseconds
+****************************************************************************/
+
+ssize_t read_socket_with_timeout(int fd,char *buf,size_t mincnt,size_t maxcnt,unsigned int time_out)
+{
+ fd_set fds;
+ int selrtn;
+ ssize_t readret;
+ size_t nread = 0;
+ struct timeval timeout;
+
+ /* just checking .... */
+ if (maxcnt <= 0)
+ return(0);
+
+ smb_read_error = 0;
+
+ /* Blocking read */
+ if (time_out == 0) {
+ if (mincnt == 0) {
+ mincnt = maxcnt;
+ }
+
+ while (nread < mincnt) {
+ readret = sys_read(fd, buf + nread, maxcnt - nread);
+
+ if (readret == 0) {
+ DEBUG(5,("read_socket_with_timeout: blocking read. EOF from client.\n"));
+ smb_read_error = READ_EOF;
+ return -1;
+ }
+
+ if (readret == -1) {
+ if (fd == client_fd) {
+ /* Try and give an error message saying what client failed. */
+ DEBUG(0,("read_socket_with_timeout: client %s read error = %s.\n",
+ client_ip_string, strerror(errno) ));
+ } else {
+ DEBUG(0,("read_socket_with_timeout: read error = %s.\n", strerror(errno) ));
+ }
+ smb_read_error = READ_ERROR;
+ return -1;
+ }
+ nread += readret;
+ }
+ return((ssize_t)nread);
+ }
+
+ /* Most difficult - timeout read */
+ /* If this is ever called on a disk file and
+ mincnt is greater then the filesize then
+ system performance will suffer severely as
+ select always returns true on disk files */
+
+ /* Set initial timeout */
+ timeout.tv_sec = (time_t)(time_out / 1000);
+ timeout.tv_usec = (long)(1000 * (time_out % 1000));
+
+ for (nread=0; nread < mincnt; ) {
+ FD_ZERO(&fds);
+ FD_SET(fd,&fds);
+
+ selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
+
+ /* Check if error */
+ if (selrtn == -1) {
+ /* something is wrong. Maybe the socket is dead? */
+ if (fd == client_fd) {
+ /* Try and give an error message saying what client failed. */
+ DEBUG(0,("read_socket_with_timeout: timeout read for client %s. select error = %s.\n",
+ client_ip_string, strerror(errno) ));
+ } else {
+ DEBUG(0,("read_socket_with_timeout: timeout read. select error = %s.\n", strerror(errno) ));
+ }
+ smb_read_error = READ_ERROR;
+ return -1;
+ }
+
+ /* Did we timeout ? */
+ if (selrtn == 0) {
+ DEBUG(10,("read_socket_with_timeout: timeout read. select timed out.\n"));
+ smb_read_error = READ_TIMEOUT;
+ return -1;
+ }
+
+ readret = sys_read(fd, buf+nread, maxcnt-nread);
+
+ if (readret == 0) {
+ /* we got EOF on the file descriptor */
+ DEBUG(5,("read_socket_with_timeout: timeout read. EOF from client.\n"));
+ smb_read_error = READ_EOF;
+ return -1;
+ }
+
+ if (readret == -1) {
+ /* the descriptor is probably dead */
+ if (fd == client_fd) {
+ /* Try and give an error message saying what client failed. */
+ DEBUG(0,("read_socket_with_timeout: timeout read to client %s. read error = %s.\n",
+ client_ip_string, strerror(errno) ));
+ } else {
+ DEBUG(0,("read_socket_with_timeout: timeout read. read error = %s.\n", strerror(errno) ));
+ }
+ smb_read_error = READ_ERROR;
+ return -1;
+ }
+
+ nread += readret;
+ }
+
+ /* Return the number we got */
+ return (ssize_t)nread;
+}
+
+/****************************************************************************
+ Read data from the client, reading exactly N bytes.
+****************************************************************************/
+
+ssize_t read_data(int fd,char *buffer,size_t N)
+{
+ ssize_t ret;
+ size_t total=0;
+
+ smb_read_error = 0;
+
+ while (total < N) {
+ ret = sys_read(fd,buffer + total,N - total);
+
+ if (ret == 0) {
+ DEBUG(10,("read_data: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
+ smb_read_error = READ_EOF;
+ return 0;
+ }
+
+ if (ret == -1) {
+ if (fd == client_fd) {
+ /* Try and give an error message saying what client failed. */
+ DEBUG(0,("read_data: read failure for %d bytes to client %s. Error = %s\n",
+ (int)(N - total), client_ip_string, strerror(errno) ));
+ } else {
+ DEBUG(0,("read_data: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
+ }
+ smb_read_error = READ_ERROR;
+ return -1;
+ }
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+
+/****************************************************************************
+ Write data to a fd.
+****************************************************************************/
+
+ssize_t write_data(int fd, const char *buffer, size_t N)
+{
+ size_t total=0;
+ ssize_t ret;
+
+ while (total < N) {
+ ret = sys_write(fd,buffer + total,N - total);
+
+ if (ret == -1) {
+ if (fd == client_fd) {
+ /* Try and give an error message saying what client failed. */
+ DEBUG(0,("write_data: write failure in writing to client %s. Error %s\n",
+ client_ip_string, strerror(errno) ));
+ } else {
+ DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) ));
+ }
+ return -1;
+ }
+
+ if (ret == 0) {
+ return total;
+ }
+
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+
+/****************************************************************************
+ Send a keepalive packet (rfc1002).
+****************************************************************************/
+
+BOOL send_keepalive(int client)
+{
+ unsigned char buf[4];
+
+ buf[0] = SMBkeepalive;
+ buf[1] = buf[2] = buf[3] = 0;
+
+ return(write_data(client,(char *)buf,4) == 4);
+}
+
+
+/****************************************************************************
+ Read 4 bytes of a smb packet and return the smb length of the packet.
+ Store the result in the buffer.
+ This version of the function will return a length of zero on receiving
+ a keepalive packet.
+ Timeout is in milliseconds.
+****************************************************************************/
+
+static ssize_t read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout)
+{
+ ssize_t len=0;
+ int msg_type;
+ BOOL ok = False;
+
+ while (!ok) {
+ if (timeout > 0)
+ ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout) == 4);
+ else
+ ok = (read_data(fd,inbuf,4) == 4);
+
+ if (!ok)
+ return(-1);
+
+ len = smb_len(inbuf);
+ msg_type = CVAL(inbuf,0);
+
+ if (msg_type == SMBkeepalive)
+ DEBUG(5,("Got keepalive packet\n"));
+ }
+
+ DEBUG(10,("got smb length of %lu\n",(unsigned long)len));
+
+ return(len);
+}
+
+/****************************************************************************
+ Read 4 bytes of a smb packet and return the smb length of the packet.
+ Store the result in the buffer. This version of the function will
+ never return a session keepalive (length of zero).
+ Timeout is in milliseconds.
+****************************************************************************/
+
+ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
+{
+ ssize_t len;
+
+ for(;;) {
+ len = read_smb_length_return_keepalive(fd, inbuf, timeout);
+
+ if(len < 0)
+ return len;
+
+ /* Ignore session keepalives. */
+ if(CVAL(inbuf,0) != SMBkeepalive)
+ break;
+ }
+
+ DEBUG(10,("read_smb_length: got smb length of %lu\n",
+ (unsigned long)len));
+
+ return len;
+}
+
+/****************************************************************************
+ Read an smb from a fd. Note that the buffer *MUST* be of size
+ BUFFER_SIZE+SAFETY_MARGIN.
+ The timeout is in milliseconds.
+ This function will return on receipt of a session keepalive packet.
+ Doesn't check the MAC on signed packets.
+****************************************************************************/
+
+BOOL receive_smb_raw(int fd, char *buffer, unsigned int timeout)
+{
+ ssize_t len,ret;
+
+ smb_read_error = 0;
+
+ memset(buffer,'\0',smb_size + 100);
+
+ len = read_smb_length_return_keepalive(fd,buffer,timeout);
+ if (len < 0) {
+ DEBUG(10,("receive_smb_raw: length < 0!\n"));
+
+ /*
+ * Correct fix. smb_read_error may have already been
+ * set. Only set it here if not already set. Global
+ * variables still suck :-). JRA.
+ */
+
+ if (smb_read_error == 0)
+ smb_read_error = READ_ERROR;
+ return False;
+ }
+
+ /*
+ * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
+ * of header. Don't print the error if this fits.... JRA.
+ */
+
+ if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
+ DEBUG(0,("Invalid packet length! (%lu bytes).\n",(unsigned long)len));
+ if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
+
+ /*
+ * Correct fix. smb_read_error may have already been
+ * set. Only set it here if not already set. Global
+ * variables still suck :-). JRA.
+ */
+
+ if (smb_read_error == 0)
+ smb_read_error = READ_ERROR;
+ return False;
+ }
+ }
+
+ if(len > 0) {
+ if (timeout > 0) {
+ ret = read_socket_with_timeout(fd,buffer+4,len,len,timeout);
+ } else {
+ ret = read_data(fd,buffer+4,len);
+ }
+
+ if (ret != len) {
+ if (smb_read_error == 0)
+ smb_read_error = READ_ERROR;
+ return False;
+ }
+
+ /* not all of samba3 properly checks for packet-termination of strings. This
+ ensures that we don't run off into empty space. */
+ SSVAL(buffer+4,len, 0);
+ }
+
+ return True;
+}
+
+/****************************************************************************
+ Wrapper for receive_smb_raw().
+ Checks the MAC on signed packets.
+****************************************************************************/
+
+BOOL receive_smb(int fd, char *buffer, unsigned int timeout)
+{
+ if (!receive_smb_raw(fd, buffer, timeout)) {
+ return False;
+ }
+
+ /* Check the incoming SMB signature. */
+ if (!srv_check_sign_mac(buffer, True)) {
+ DEBUG(0, ("receive_smb: SMB Signature verification failed on incoming packet!\n"));
+ if (smb_read_error == 0)
+ smb_read_error = READ_BAD_SIG;
+ return False;
+ };
+
+ return(True);
+}
+
+/****************************************************************************
+ Send an smb to a fd.
+****************************************************************************/
+
+BOOL send_smb(int fd, char *buffer)
+{
+ size_t len;
+ size_t nwritten=0;
+ ssize_t ret;
+
+ /* Sign the outgoing packet if required. */
+ srv_calculate_sign_mac(buffer);
+
+ len = smb_len(buffer) + 4;
+
+ while (nwritten < len) {
+ ret = write_data(fd,buffer+nwritten,len - nwritten);
+ if (ret <= 0) {
+ DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
+ (int)len,(int)ret, strerror(errno) ));
+ return False;
+ }
+ nwritten += ret;
+ }
+
+ return True;
+}
+
+/****************************************************************************
+ Open a socket of the specified type, port, and address for incoming data.
+****************************************************************************/
+
+int open_socket_in( int type, int port, int dlevel, uint32 socket_addr, BOOL rebind )
+{
+ struct sockaddr_in sock;
+ int res;
+
+ memset( (char *)&sock, '\0', sizeof(sock) );
+
+#ifdef HAVE_SOCK_SIN_LEN
+ sock.sin_len = sizeof(sock);
+#endif
+ sock.sin_port = htons( port );
+ sock.sin_family = AF_INET;
+ sock.sin_addr.s_addr = socket_addr;
+
+ res = socket( AF_INET, type, 0 );
+ if( res == -1 ) {
+ if( DEBUGLVL(0) ) {
+ dbgtext( "open_socket_in(): socket() call failed: " );
+ dbgtext( "%s\n", strerror( errno ) );
+ }
+ return -1;
+ }
+
+ /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
+ {
+ int val = rebind ? 1 : 0;
+ if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) == -1 ) {
+ if( DEBUGLVL( dlevel ) ) {
+ dbgtext( "open_socket_in(): setsockopt: " );
+ dbgtext( "SO_REUSEADDR = %s ", val?"True":"False" );
+ dbgtext( "on port %d failed ", port );
+ dbgtext( "with error = %s\n", strerror(errno) );
+ }
+ }
+#ifdef SO_REUSEPORT
+ if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) == -1 ) {
+ if( DEBUGLVL( dlevel ) ) {
+ dbgtext( "open_socket_in(): setsockopt: ");
+ dbgtext( "SO_REUSEPORT = %s ", val?"True":"False" );
+ dbgtext( "on port %d failed ", port );
+ dbgtext( "with error = %s\n", strerror(errno) );
+ }
+ }
+#endif /* SO_REUSEPORT */
+ }
+
+ /* now we've got a socket - we need to bind it */
+ if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) {
+ if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) {
+ dbgtext( "bind failed on port %d ", port );
+ dbgtext( "socket_addr = %s.\n", inet_ntoa( sock.sin_addr ) );
+ dbgtext( "Error = %s\n", strerror(errno) );
+ }
+ close( res );
+ return( -1 );
+ }
+
+ DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
+
+ return( res );
+ }
+
+/****************************************************************************
+ Create an outgoing socket. timeout is in milliseconds.
+**************************************************************************/
+
+int open_socket_out(int type, struct in_addr *addr, int port ,int timeout)
+{
+ struct sockaddr_in sock_out;
+ int res,ret;
+ int connect_loop = 10;
+ int increment = 10;
+
+ /* create a socket to write to */
+ res = socket(PF_INET, type, 0);
+ if (res == -1) {
+ DEBUG(0,("socket error (%s)\n", strerror(errno)));
+ return -1;
+ }
+
+ if (type != SOCK_STREAM)
+ return(res);
+
+ memset((char *)&sock_out,'\0',sizeof(sock_out));
+ putip((char *)&sock_out.sin_addr,(char *)addr);
+
+ sock_out.sin_port = htons( port );
+ sock_out.sin_family = PF_INET;
+
+ /* set it non-blocking */
+ set_blocking(res,False);
+
+ DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port));
+
+ /* and connect it to the destination */
+ connect_again:
+
+ ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));
+
+ /* Some systems return EAGAIN when they mean EINPROGRESS */
+ if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
+ errno == EAGAIN) && (connect_loop < timeout) ) {
+ smb_msleep(connect_loop);
+ timeout -= connect_loop;
+ connect_loop += increment;
+ if (increment < 250) {
+ /* After 8 rounds we end up at a max of 255 msec */
+ increment *= 1.5;
+ }
+ goto connect_again;
+ }
+
+ if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
+ errno == EAGAIN)) {
+ DEBUG(1,("timeout connecting to %s:%d\n",inet_ntoa(*addr),port));
+ close(res);
+ return -1;
+ }
+
+#ifdef EISCONN
+
+ if (ret < 0 && errno == EISCONN) {
+ errno = 0;
+ ret = 0;
+ }
+#endif
+
+ if (ret < 0) {
+ DEBUG(2,("error connecting to %s:%d (%s)\n",
+ inet_ntoa(*addr),port,strerror(errno)));
+ close(res);
+ return -1;
+ }
+
+ /* set it blocking again */
+ set_blocking(res,True);
+
+ return res;
+}
+
+/****************************************************************************
+ Create an outgoing TCP socket to any of the addrs. This is for
+ simultaneous connects to port 445 and 139 of a host or even a variety
+ of DC's all of which are equivalent for our purposes.
+**************************************************************************/
+
+BOOL open_any_socket_out(struct sockaddr_in *addrs, int num_addrs,
+ int timeout, int *fd_index, int *fd)
+{
+ int i, resulting_index, res;
+ int *sockets;
+ BOOL good_connect;
+
+ fd_set r_fds, wr_fds;
+ struct timeval tv;
+ int maxfd;
+
+ int connect_loop = 10000; /* 10 milliseconds */
+
+ timeout *= 1000; /* convert to microseconds */
+
+ sockets = SMB_MALLOC_ARRAY(int, num_addrs);
+
+ if (sockets == NULL)
+ return False;
+
+ resulting_index = -1;
+
+ for (i=0; i<num_addrs; i++)
+ sockets[i] = -1;
+
+ for (i=0; i<num_addrs; i++) {
+ sockets[i] = socket(PF_INET, SOCK_STREAM, 0);
+ if (sockets[i] < 0)
+ goto done;
+ set_blocking(sockets[i], False);
+ }
+
+ connect_again:
+ good_connect = False;
+
+ for (i=0; i<num_addrs; i++) {
+
+ if (sockets[i] == -1)
+ continue;
+
+ if (connect(sockets[i], (struct sockaddr *)&(addrs[i]),
+ sizeof(*addrs)) == 0) {
+ /* Rather unlikely as we are non-blocking, but it
+ * might actually happen. */
+ resulting_index = i;
+ goto done;
+ }
+
+ if (errno == EINPROGRESS || errno == EALREADY ||
+ errno == EAGAIN) {
+ /* These are the error messages that something is
+ progressing. */
+ good_connect = True;
+ } else if (errno != 0) {
+ /* There was a direct error */
+ close(sockets[i]);
+ sockets[i] = -1;
+ }
+ }
+
+ if (!good_connect) {
+ /* All of the connect's resulted in real error conditions */
+ goto done;
+ }
+
+ /* Lets see if any of the connect attempts succeeded */
+
+ maxfd = 0;
+ FD_ZERO(&wr_fds);
+ FD_ZERO(&r_fds);
+
+ for (i=0; i<num_addrs; i++) {
+ if (sockets[i] == -1)
+ continue;
+ FD_SET(sockets[i], &wr_fds);
+ FD_SET(sockets[i], &r_fds);
+ if (sockets[i]>maxfd)
+ maxfd = sockets[i];
+ }
+
+ tv.tv_sec = 0;
+ tv.tv_usec = connect_loop;
+
+ res = sys_select(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
+
+ if (res < 0)
+ goto done;
+
+ if (res == 0)
+ goto next_round;
+
+ for (i=0; i<num_addrs; i++) {
+
+ if (sockets[i] == -1)
+ continue;
+
+ /* Stevens, Network Programming says that if there's a
+ * successful connect, the socket is only writable. Upon an
+ * error, it's both readable and writable. */
+
+ if (FD_ISSET(sockets[i], &r_fds) &&
+ FD_ISSET(sockets[i], &wr_fds)) {
+ /* readable and writable, so it's an error */
+ close(sockets[i]);
+ sockets[i] = -1;
+ continue;
+ }
+
+ if (!FD_ISSET(sockets[i], &r_fds) &&
+ FD_ISSET(sockets[i], &wr_fds)) {
+ /* Only writable, so it's connected */
+ resulting_index = i;
+ goto done;
+ }
+ }
+
+ next_round:
+
+ timeout -= connect_loop;
+ if (timeout <= 0)
+ goto done;
+ connect_loop *= 1.5;
+ if (connect_loop > timeout)
+ connect_loop = timeout;
+ goto connect_again;
+
+ done:
+ for (i=0; i<num_addrs; i++) {
+ if (i == resulting_index)
+ continue;
+ if (sockets[i] >= 0)
+ close(sockets[i]);
+ }
+
+ if (resulting_index >= 0) {
+ *fd_index = resulting_index;
+ *fd = sockets[*fd_index];
+ set_blocking(*fd, True);
+ }
+
+ free(sockets);
+
+ return (resulting_index >= 0);
+}
+/****************************************************************************
+ Open a connected UDP socket to host on port
+**************************************************************************/
+
+int open_udp_socket(const char *host, int port)
+{
+ int type = SOCK_DGRAM;
+ struct sockaddr_in sock_out;
+ int res;
+ struct in_addr *addr;
+
+ addr = interpret_addr2(host);
+
+ res = socket(PF_INET, type, 0);
+ if (res == -1) {
+ return -1;
+ }
+
+ memset((char *)&sock_out,'\0',sizeof(sock_out));
+ putip((char *)&sock_out.sin_addr,(char *)addr);
+ sock_out.sin_port = htons(port);
+ sock_out.sin_family = PF_INET;
+
+ if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
+ close(res);
+ return -1;
+ }
+
+ return res;
+}
+
+
+/*******************************************************************
+ Matchname - determine if host name matches IP address. Used to
+ confirm a hostname lookup to prevent spoof attacks.
+******************************************************************/
+
+static BOOL matchname(char *remotehost,struct in_addr addr)
+{
+ struct hostent *hp;
+ int i;
+
+ if ((hp = sys_gethostbyname(remotehost)) == 0) {
+ DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n", remotehost));
+ return False;
+ }
+
+ /*
+ * Make sure that gethostbyname() returns the "correct" host name.
+ * Unfortunately, gethostbyname("localhost") sometimes yields
+ * "localhost.domain". Since the latter host name comes from the
+ * local DNS, we just have to trust it (all bets are off if the local
+ * DNS is perverted). We always check the address list, though.
+ */
+
+ if (!strequal(remotehost, hp->h_name)
+ && !strequal(remotehost, "localhost")) {
+ DEBUG(0,("host name/name mismatch: %s != %s\n",
+ remotehost, hp->h_name));
+ return False;
+ }
+
+ /* Look up the host address in the address list we just got. */
+ for (i = 0; hp->h_addr_list[i]; i++) {
+ if (memcmp(hp->h_addr_list[i], (char *) & addr, sizeof(addr)) == 0)
+ return True;
+ }
+
+ /*
+ * The host name does not map to the original host address. Perhaps
+ * someone has compromised a name server. More likely someone botched
+ * it, but that could be dangerous, too.
+ */
+
+ DEBUG(0,("host name/address mismatch: %s != %s\n",
+ inet_ntoa(addr), hp->h_name));
+ return False;
+}
+
+/*******************************************************************
+ Return the DNS name of the remote end of a socket.
+******************************************************************/
+
+char *get_peer_name(int fd, BOOL force_lookup)
+{
+ static pstring name_buf;
+ pstring tmp_name;
+ static fstring addr_buf;
+ struct hostent *hp;
+ struct in_addr addr;
+ char *p;
+
+ /* reverse lookups can be *very* expensive, and in many
+ situations won't work because many networks don't link dhcp
+ with dns. To avoid the delay we avoid the lookup if
+ possible */
+ if (!lp_hostname_lookups() && (force_lookup == False)) {
+ return get_peer_addr(fd);
+ }
+
+ p = get_peer_addr(fd);
+
+ /* it might be the same as the last one - save some DNS work */
+ if (strcmp(p, addr_buf) == 0)
+ return name_buf;
+
+ pstrcpy(name_buf,"UNKNOWN");
+ if (fd == -1)
+ return name_buf;
+
+ fstrcpy(addr_buf, p);
+
+ addr = *interpret_addr2(p);
+
+ /* Look up the remote host name. */
+ if ((hp = gethostbyaddr((char *)&addr.s_addr, sizeof(addr.s_addr), AF_INET)) == 0) {
+ DEBUG(1,("Gethostbyaddr failed for %s\n",p));
+ pstrcpy(name_buf, p);
+ } else {
+ pstrcpy(name_buf,(char *)hp->h_name);
+ if (!matchname(name_buf, addr)) {
+ DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
+ pstrcpy(name_buf,"UNKNOWN");
+ }
+ }
+
+ /* can't pass the same source and dest strings in when you
+ use --enable-developer or the clobber_region() call will
+ get you */
+
+ pstrcpy( tmp_name, name_buf );
+ alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
+ if (strstr(name_buf,"..")) {
+ pstrcpy(name_buf, "UNKNOWN");
+ }
+
+ return name_buf;
+}
+
+/*******************************************************************
+ Return the IP addr of the remote end of a socket as a string.
+ ******************************************************************/
+
+char *get_peer_addr(int fd)
+{
+ struct sockaddr sa;
+ struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
+ socklen_t length = sizeof(sa);
+ static fstring addr_buf;
+
+ fstrcpy(addr_buf,"0.0.0.0");
+
+ if (fd == -1) {
+ return addr_buf;
+ }
+
+ if (getpeername(fd, &sa, &length) < 0) {
+ DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
+ return addr_buf;
+ }
+
+ fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
+
+ return addr_buf;
+}
+
+/*******************************************************************
+ Create protected unix domain socket.
+
+ Some unixes cannot set permissions on a ux-dom-sock, so we
+ have to make sure that the directory contains the protection
+ permissions instead.
+ ******************************************************************/
+
+int create_pipe_sock(const char *socket_dir,
+ const char *socket_name,
+ mode_t dir_perms)
+{
+#ifdef HAVE_UNIXSOCKET
+ struct sockaddr_un sunaddr;
+ struct stat st;
+ int sock;
+ mode_t old_umask;
+ pstring path;
+
+ old_umask = umask(0);
+
+ /* Create the socket directory or reuse the existing one */
+
+ if (lstat(socket_dir, &st) == -1) {
+ if (errno == ENOENT) {
+ /* Create directory */
+ if (mkdir(socket_dir, dir_perms) == -1) {
+ DEBUG(0, ("error creating socket directory "
+ "%s: %s\n", socket_dir,
+ strerror(errno)));
+ goto out_umask;
+ }
+ } else {
+ DEBUG(0, ("lstat failed on socket directory %s: %s\n",
+ socket_dir, strerror(errno)));
+ goto out_umask;
+ }
+ } else {
+ /* Check ownership and permission on existing directory */
+ if (!S_ISDIR(st.st_mode)) {
+ DEBUG(0, ("socket directory %s isn't a directory\n",
+ socket_dir));
+ goto out_umask;
+ }
+ if ((st.st_uid != sec_initial_uid()) ||
+ ((st.st_mode & 0777) != dir_perms)) {
+ DEBUG(0, ("invalid permissions on socket directory "
+ "%s\n", socket_dir));
+ goto out_umask;
+ }
+ }
+
+ /* Create the socket file */
+
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+
+ if (sock == -1) {
+ perror("socket");
+ goto out_umask;
+ }
+
+ pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
+
+ unlink(path);
+ memset(&sunaddr, 0, sizeof(sunaddr));
+ sunaddr.sun_family = AF_UNIX;
+ safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
+
+ if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
+ DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
+ strerror(errno)));
+ goto out_close;
+ }
+
+ if (listen(sock, 5) == -1) {
+ DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
+ strerror(errno)));
+ goto out_close;
+ }
+
+ umask(old_umask);
+ return sock;
+
+out_close:
+ close(sock);
+
+out_umask:
+ umask(old_umask);
+ return -1;
+
+#else
+ DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
+ return -1;
+#endif /* HAVE_UNIXSOCKET */
+}
projects / samba / blobdiff