/* Unix SMB/CIFS implementation. Samba utility functions Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Tim Potter 2000-2001 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 last IP received from */ struct in_addr lastip; /* the last port received from */ int lastport=0; int smb_read_error = 0; 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); } /**************************************************************************** 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 {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); } /**************************************************************************** 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) { 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? */ 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 */ 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) { 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; } /**************************************************************************** Read data from a socket, reading exactly N bytes. ****************************************************************************/ static ssize_t read_socket_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_socket_data: recv 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_socket_data: recv 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) { DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) )); return -1; } if (ret == 0) return total; total += ret; } return (ssize_t)total; } /**************************************************************************** Write data to a socket - use send rather than write. ****************************************************************************/ static ssize_t write_socket_data(int fd, const char *buffer, size_t N) { size_t total=0; ssize_t ret; while (total < N) { ret = sys_send(fd,buffer + total,N - total,0); if (ret == -1) { DEBUG(0,("write_socket_data: write failure. Error = %s\n", strerror(errno) )); return -1; } if (ret == 0) return total; total += ret; } return (ssize_t)total; } /**************************************************************************** Write to a socket. ****************************************************************************/ ssize_t write_socket(int fd, const char *buf, size_t len) { ssize_t ret=0; DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len)); ret = write_socket_data(fd,buf,len); DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret)); if(ret <= 0) DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n", (int)len, fd, strerror(errno) )); return(ret); } /**************************************************************************** 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_socket_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_socket_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) { ret = read_socket_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_socket(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; imaxfd) 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 timeout) connect_loop = timeout; goto connect_again; done: for (i=0; 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; } /* 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; void client_setfd(int fd) { client_fd = fd; } 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; } /******************************************************************* 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 */ }