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|
/*
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) {
/* Don't print a low debug error for a non-blocking socket. */
if (errno == EAGAIN) {
DEBUG(10,("read socket returned EAGAIN. ERRNO=%s\n",strerror(errno)));
} else {
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;
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)
{
NTSTATUS status;
if (!receive_smb_raw(fd, buffer, timeout)) {
return False;
}
status = srv_decrypt_buffer(buffer);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("receive_smb: SMB decryption failed on incoming packet! Error %s\n",
nt_errstr(status) ));
if (smb_read_error == 0) {
smb_read_error = READ_BAD_DECRYPT;
}
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)
{
NTSTATUS status;
size_t len;
size_t nwritten=0;
ssize_t ret;
/* Sign the outgoing packet if required. */
srv_calculate_sign_mac(buffer);
status = srv_encrypt_buffer(buffer);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("send_smb: SMB encryption failed on outgoing packet! Error %s\n",
nt_errstr(status) ));
return False;
}
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 || errno == EINTR) {
/* 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_intr(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 */
}
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