mirrors/mc
1
0
Fork 0
mirror of https://github.com/MidnightCommander/mc synced 2024-12-23 12:56:51 +03:00
Code Issues Packages Projects Releases Wiki Activity
a2d1d4e8dc
mc/vfs/samba/lib/util_sock.c

898 lines
23 KiB
C
Raw Blame History

/*
Unix SMB/Netbios implementation.
Version 1.9.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-1998
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"
#ifdef WITH_SSL
#include <ssl.h>
#undef Realloc /* SSLeay defines this and samba has a function of this name */
extern SSL *ssl;
extern int sslFd;
#endif /* WITH_SSL */
extern int DEBUGLEVEL;
BOOL passive = False;
/* the client file descriptor */
int Client = -1;
/* 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,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};
static const struct
{
char *name;
int level;
int option;
int value;
int opttype;
} 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 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_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
{NULL,0,0,0,0}};
/****************************************************************************
set user socket options
****************************************************************************/
void set_socket_options(int fd, 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(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\n",tok));
}
}
/****************************************************************************
close the socket communication
****************************************************************************/
void close_sockets(void )
{
#ifdef WITH_SSL
sslutil_disconnect(Client);
#endif /* WITH_SSL */
close(Client);
Client = -1;
}
/****************************************************************************
write to a socket
****************************************************************************/
ssize_t write_socket(int fd,char *buf,size_t len)
{
ssize_t ret=0;
if (passive)
return(len);
DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
ret = write_data(fd,buf,len);
DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
if(ret <= 0)
DEBUG(1,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
(int)len, fd, strerror(errno) ));
return(ret);
}
/****************************************************************************
read from a socket
****************************************************************************/
ssize_t read_udp_socket(int fd,char *buf,size_t len)
{
ssize_t ret;
struct sockaddr_in sock;
int socklen;
socklen = sizeof(sock);
memset((char *)&sock,'\0',socklen);
memset((char *)&lastip,'\0',sizeof(lastip));
ret = (ssize_t)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: %d\n",
inet_ntoa(lastip), lastport, ret));
return(ret);
}
/****************************************************************************
read data from a device 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_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) {
#ifdef WITH_SSL
if(fd == sslFd){
readret = SSL_read(ssl, buf + nread, maxcnt - nread);
}else{
readret = read(fd, buf + nread, maxcnt - nread);
}
#else /* WITH_SSL */
readret = read(fd, buf + nread, maxcnt - nread);
#endif /* WITH_SSL */
if (readret == 0) {
DEBUG(5,("read_with_timeout: blocking read. EOF from client.\n"));
smb_read_error = READ_EOF;
return -1;
}
if (readret == -1) {
DEBUG(0,("read_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(fd+1,&fds,&timeout);
/* Check if error */
if(selrtn == -1) {
/* something is wrong. Maybe the socket is dead? */
DEBUG(0,("read_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_with_timeout: timeout read. select timed out.\n"));
smb_read_error = READ_TIMEOUT;
return -1;
}
#ifdef WITH_SSL
if(fd == sslFd){
readret = SSL_read(ssl, buf + nread, maxcnt - nread);
}else{
readret = read(fd, buf + nread, maxcnt - nread);
}
#else /* WITH_SSL */
readret = read(fd, buf+nread, maxcnt-nread);
#endif /* WITH_SSL */
if (readret == 0) {
/* we got EOF on the file descriptor */
DEBUG(5,("read_with_timeout: timeout read. EOF from client.\n"));
smb_read_error = READ_EOF;
return -1;
}
if (readret == -1) {
/* the descriptor is probably dead */
DEBUG(0,("read_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);
}
/****************************************************************************
send a keepalive packet (rfc1002)
****************************************************************************/
BOOL send_keepalive(int client)
{
unsigned char buf[4];
buf[0] = 0x85;
buf[1] = buf[2] = buf[3] = 0;
return(write_data(client,(char *)buf,4) == 4);
}
/****************************************************************************
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)
{
#ifdef WITH_SSL
if(fd == sslFd){
ret = SSL_read(ssl, buffer + total, N - total);
}else{
ret = read(fd,buffer + total,N - total);
}
#else /* WITH_SSL */
ret = read(fd,buffer + total,N - total);
#endif /* WITH_SSL */
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)
{
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,char *buffer,size_t N)
{
size_t total=0;
ssize_t ret;
while (total < N)
{
#ifdef WITH_SSL
if(fd == sslFd){
ret = SSL_write(ssl,buffer + total,N - total);
}else{
ret = write(fd,buffer + total,N - total);
}
#else /* WITH_SSL */
ret = write(fd,buffer + total,N - total);
#endif /* WITH_SSL */
if (ret == -1) {
DEBUG(1,("write_data: write failure. Error = %s\n", strerror(errno) ));
return -1;
}
if (ret == 0) return total;
total += ret;
}
return (ssize_t)total;
}
/****************************************************************************
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_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 == 0x85)
DEBUG(5,("Got keepalive packet\n"));
}
DEBUG(10,("got smb length of %d\n",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) != 0x85)
break;
}
DEBUG(10,("read_smb_length: got smb length of %d\n",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 a
receipt of a session keepalive packet.
****************************************************************************/
BOOL receive_smb(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: length < 0!\n"));
return(False);
}
if (len > BUFFER_SIZE) {
DEBUG(0,("Invalid packet length! (%d bytes).\n",len));
if (len > BUFFER_SIZE + (SAFETY_MARGIN/2))
{
exit(1);
}
}
if(len > 0) {
ret = read_data(fd,buffer+4,len);
if (ret != len) {
smb_read_error = READ_ERROR;
return False;
}
}
return(True);
}
/****************************************************************************
read an smb from a fd ignoring all keepalive packets. Note that the buffer
*MUST* be of size BUFFER_SIZE+SAFETY_MARGIN.
The timeout is in milliseconds
This is exactly the same as receive_smb except that it never returns
a session keepalive packet (just as receive_smb used to do).
receive_smb was changed to return keepalives as the oplock processing means this call
should never go into a blocking read.
****************************************************************************/
BOOL client_receive_smb(int fd,char *buffer, unsigned int timeout)
{
BOOL ret;
for(;;)
{
ret = receive_smb(fd, buffer, timeout);
if (!ret)
{
DEBUG(10,("client_receive_smb failed\n"));
show_msg(buffer);
return ret;
}
/* Ignore session keepalive packets. */
if(CVAL(buffer,0) != 0x85)
break;
}
show_msg(buffer);
return ret;
}
/****************************************************************************
send an null session message to a fd
****************************************************************************/
BOOL send_null_session_msg(int fd)
{
ssize_t ret;
uint32 blank = 0;
size_t len = 4;
size_t nwritten=0;
char *buffer = (char *)&blank;
while (nwritten < len)
{
ret = write_socket(fd,buffer+nwritten,len - nwritten);
if (ret <= 0)
{
DEBUG(0,("send_null_session_msg: Error writing %d bytes to client. %d. Exiting\n",(int)len,(int)ret));
close_sockets();
exit(1);
}
nwritten += ret;
}
DEBUG(10,("send_null_session_msg: sent 4 null bytes to client.\n"));
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;
len = smb_len(buffer) + 4;
while (nwritten < len)
{
ret = write_socket(fd,buffer+nwritten,len - nwritten);
if (ret <= 0)
{
DEBUG(0,("Error writing %d bytes to client. %d. Exiting\n",(int)len,(int)ret));
close_sockets();
exit(1);
}
nwritten += ret;
}
return True;
}
/****************************************************************************
send a single packet to a port on another machine
****************************************************************************/
BOOL send_one_packet(char *buf,int len,struct in_addr ip,int port,int type)
{
BOOL ret;
int out_fd;
struct sockaddr_in sock_out;
if (passive)
return(True);
/* create a socket to write to */
out_fd = socket(AF_INET, type, 0);
if (out_fd == -1)
{
DEBUG(0,("socket failed"));
return False;
}
/* set the address and port */
memset((char *)&sock_out,'\0',sizeof(sock_out));
putip((char *)&sock_out.sin_addr,(char *)&ip);
sock_out.sin_port = htons( port );
sock_out.sin_family = AF_INET;
if (DEBUGLEVEL > 0)
DEBUG(3,("sending a packet of len %d to (%s) on port %d of type %s\n",
len,inet_ntoa(ip),port,type==SOCK_DGRAM?"DGRAM":"STREAM"));
/* send it */
ret = (sendto(out_fd,buf,len,0,(struct sockaddr *)&sock_out,sizeof(sock_out)) >= 0);
if (!ret)
DEBUG(0,("Packet send to %s(%d) failed ERRNO=%s\n",
inet_ntoa(ip),port,strerror(errno)));
close(out_fd);
return(ret);
}
/****************************************************************************
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 hostent *hp;
struct sockaddr_in sock;
pstring host_name;
int res;
/* get my host name */
if (gethostname(host_name, MAXHOSTNAMELEN) == -1)
{ DEBUG(0,("gethostname failed\n")); return -1; }
/* get host info */
if ((hp = Get_Hostbyname(host_name)) == 0)
{
DEBUG(0,( "Get_Hostbyname: Unknown host %s\n",host_name));
return -1;
}
memset((char *)&sock,'\0',sizeof(sock));
memcpy((char *)&sock.sin_addr,(char *)hp->h_addr, hp->h_length);
#ifdef HAVE_SOCK_SIN_LEN
sock.sin_len = sizeof(sock);
#endif
sock.sin_port = htons( port );
sock.sin_family = hp->h_addrtype;
sock.sin_addr.s_addr = socket_addr;
res = socket(hp->h_addrtype, type, 0);
if (res == -1)
{ DEBUG(0,("socket failed\n")); return -1; }
{
int val=1;
if(rebind)
val=1;
else
val=0;
setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
}
/* now we've got a socket - we need to bind it */
if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0)
{
if (port) {
if (port == SMB_PORT || port == NMB_PORT)
DEBUG(dlevel,("bind failed on port %d socket_addr=%s (%s)\n",
port,inet_ntoa(sock.sin_addr),strerror(errno)));
close(res);
if (dlevel > 0 && port < 1000)
port = 7999;
if (port >= 1000 && port < 9000)
return(open_socket_in(type,port+1,dlevel,socket_addr,rebind));
}
return(-1);
}
DEBUG(3,("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 = 250; /* 250 milliseconds */
int loops = (timeout) / connect_loop;
/* create a socket to write to */
res = socket(PF_INET, type, 0);
if (res == -1)
{ DEBUG(0,("socket error\n")); 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) && loops--) {
msleep(connect_loop);
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(1,("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;
}
/*******************************************************************
Reset the 'done' variables so after a client process is created
from a fork call these calls will be re-done. This should be
expanded if more variables need reseting.
******************************************************************/
static BOOL global_client_name_done = False;
static BOOL global_client_addr_done = False;
void reset_globals_after_fork(void)
{
global_client_name_done = False;
global_client_addr_done = False;
/*
* Re-seed the random crypto generator, so all smbd's
* started from the same parent won't generate the same
* sequence.
*/
{
unsigned char dummy;
generate_random_buffer( &dummy, 1, True);
}
}
/*******************************************************************
return the DNS name of the client
******************************************************************/
char *client_name(int fd)
{
struct sockaddr sa;
struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
int length = sizeof(sa);
static pstring name_buf;
struct hostent *hp;
static int last_fd=-1;
if (global_client_name_done && last_fd == fd)
return name_buf;
last_fd = fd;
global_client_name_done = False;
pstrcpy(name_buf,"UNKNOWN");
if (fd == -1) {
return name_buf;
}
if (getpeername(fd, &sa, &length) < 0) {
DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
return name_buf;
}
/* Look up the remote host name. */
if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
sizeof(sockin->sin_addr),
AF_INET)) == 0) {
DEBUG(1,("Gethostbyaddr failed for %s\n",client_addr(fd)));
StrnCpy(name_buf,client_addr(fd),sizeof(name_buf) - 1);
} else {
StrnCpy(name_buf,(char *)hp->h_name,sizeof(name_buf) - 1);
if (!matchname(name_buf, sockin->sin_addr)) {
DEBUG(0,("Matchname failed on %s %s\n",name_buf,client_addr(fd)));
pstrcpy(name_buf,"UNKNOWN");
}
}
global_client_name_done = True;
return name_buf;
}
/*******************************************************************
return the IP addr of the client as a string
******************************************************************/
char *client_addr(int fd)
{
struct sockaddr sa;
struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
int length = sizeof(sa);
static fstring addr_buf;
static int last_fd = -1;
if (global_client_addr_done && fd == last_fd)
return addr_buf;
last_fd = fd;
global_client_addr_done = False;
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));
global_client_addr_done = True;
return addr_buf;
}
Reference in New Issue View Git Blame Copy Permalink