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dc3c14fc2b
(Double checked)
1161 lines
31 KiB
C
1161 lines
31 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Tim Potter 2000-2001
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/* the last IP received from */
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struct in_addr lastip;
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/* the last port received from */
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int lastport=0;
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int smb_read_error = 0;
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/****************************************************************************
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Determine if a file descriptor is in fact a socket.
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****************************************************************************/
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BOOL is_a_socket(int fd)
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{
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int v,l;
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l = sizeof(int);
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return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
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}
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enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
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typedef struct smb_socket_option {
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char *name;
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int level;
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int option;
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int value;
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int opttype;
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} smb_socket_option;
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static const smb_socket_option socket_options[] = {
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{"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
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{"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
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{"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
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#ifdef TCP_NODELAY
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{"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
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#endif
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#ifdef IPTOS_LOWDELAY
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{"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
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#endif
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#ifdef IPTOS_THROUGHPUT
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{"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
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#endif
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#ifdef SO_REUSEPORT
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{"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
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#endif
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#ifdef SO_SNDBUF
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{"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
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#endif
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#ifdef SO_RCVBUF
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{"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
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#endif
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#ifdef SO_SNDLOWAT
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{"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
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#endif
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#ifdef SO_RCVLOWAT
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{"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
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#endif
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#ifdef SO_SNDTIMEO
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{"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
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#endif
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#ifdef SO_RCVTIMEO
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{"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
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#endif
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{NULL,0,0,0,0}};
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/****************************************************************************
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Print socket options.
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****************************************************************************/
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static void print_socket_options(int s)
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{
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int value, vlen = 4;
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const smb_socket_option *p = &socket_options[0];
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for (; p->name != NULL; p++) {
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if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) {
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DEBUG(5,("Could not test socket option %s.\n", p->name));
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} else {
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DEBUG(5,("socket option %s = %d\n",p->name,value));
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}
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}
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}
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/****************************************************************************
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Set user socket options.
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****************************************************************************/
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void set_socket_options(int fd, char *options)
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{
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fstring tok;
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while (next_token(&options,tok," \t,", sizeof(tok))) {
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int ret=0,i;
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int value = 1;
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char *p;
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BOOL got_value = False;
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if ((p = strchr_m(tok,'='))) {
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*p = 0;
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value = atoi(p+1);
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got_value = True;
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}
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for (i=0;socket_options[i].name;i++)
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if (strequal(socket_options[i].name,tok))
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break;
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if (!socket_options[i].name) {
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DEBUG(0,("Unknown socket option %s\n",tok));
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continue;
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}
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switch (socket_options[i].opttype) {
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case OPT_BOOL:
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case OPT_INT:
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ret = setsockopt(fd,socket_options[i].level,
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socket_options[i].option,(char *)&value,sizeof(int));
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break;
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case OPT_ON:
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if (got_value)
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DEBUG(0,("syntax error - %s does not take a value\n",tok));
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{
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int on = socket_options[i].value;
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ret = setsockopt(fd,socket_options[i].level,
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socket_options[i].option,(char *)&on,sizeof(int));
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}
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break;
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}
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if (ret != 0)
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DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) ));
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}
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print_socket_options(fd);
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}
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/****************************************************************************
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Read from a socket.
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****************************************************************************/
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ssize_t read_udp_socket(int fd,char *buf,size_t len)
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{
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ssize_t ret;
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struct sockaddr_in sock;
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socklen_t socklen = sizeof(sock);
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memset((char *)&sock,'\0',socklen);
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memset((char *)&lastip,'\0',sizeof(lastip));
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ret = (ssize_t)sys_recvfrom(fd,buf,len,0,(struct sockaddr *)&sock,&socklen);
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if (ret <= 0) {
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DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno)));
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return(0);
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}
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lastip = sock.sin_addr;
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lastport = ntohs(sock.sin_port);
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DEBUG(10,("read_udp_socket: lastip %s lastport %d read: %d\n",
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inet_ntoa(lastip), lastport, ret));
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return(ret);
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}
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/*******************************************************************
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checks if read data is outstanding.
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********************************************************************/
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static int read_data_outstanding(int fd, unsigned int time_out)
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{
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int selrtn;
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fd_set fds;
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struct timeval timeout;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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timeout.tv_sec = (time_t) (time_out / 1000);
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timeout.tv_usec = (long)(1000 * (time_out % 1000));
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selrtn = sys_select_intr(fd + 1, &fds, NULL, NULL, &timeout);
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if (selrtn <= 0)
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{
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return selrtn;
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}
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return FD_ISSET(fd, &fds) ? 1 : 0;
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}
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/****************************************************************************
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Read data from a socket with a timout in msec.
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mincount = if timeout, minimum to read before returning
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maxcount = number to be read.
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time_out = timeout in milliseconds
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****************************************************************************/
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static ssize_t read_socket_with_timeout(int fd,char *buf,size_t mincnt,size_t maxcnt,unsigned int time_out)
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{
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fd_set fds;
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int selrtn;
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ssize_t readret;
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size_t nread = 0;
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struct timeval timeout;
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/* just checking .... */
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if (maxcnt <= 0)
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return(0);
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smb_read_error = 0;
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/* Blocking read */
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if (time_out <= 0) {
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if (mincnt == 0) mincnt = maxcnt;
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while (nread < mincnt) {
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readret = sys_read(fd, buf + nread, maxcnt - nread);
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if (readret == 0) {
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DEBUG(5,("read_socket_with_timeout: blocking read. EOF from client.\n"));
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smb_read_error = READ_EOF;
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return -1;
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}
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if (readret == -1) {
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DEBUG(0,("read_socket_with_timeout: read error = %s.\n", strerror(errno) ));
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smb_read_error = READ_ERROR;
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return -1;
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}
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nread += readret;
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}
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return((ssize_t)nread);
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}
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/* Most difficult - timeout read */
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/* If this is ever called on a disk file and
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mincnt is greater then the filesize then
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system performance will suffer severely as
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select always returns true on disk files */
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/* Set initial timeout */
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timeout.tv_sec = (time_t)(time_out / 1000);
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timeout.tv_usec = (long)(1000 * (time_out % 1000));
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for (nread=0; nread < mincnt; ) {
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FD_ZERO(&fds);
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FD_SET(fd,&fds);
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selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
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/* Check if error */
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if (selrtn == -1) {
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/* something is wrong. Maybe the socket is dead? */
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DEBUG(0,("read_socket_with_timeout: timeout read. select error = %s.\n", strerror(errno) ));
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smb_read_error = READ_ERROR;
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return -1;
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}
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/* Did we timeout ? */
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if (selrtn == 0) {
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DEBUG(10,("read_socket_with_timeout: timeout read. select timed out.\n"));
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smb_read_error = READ_TIMEOUT;
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return -1;
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}
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readret = sys_read(fd, buf+nread, maxcnt-nread);
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if (readret == 0) {
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/* we got EOF on the file descriptor */
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DEBUG(5,("read_socket_with_timeout: timeout read. EOF from client.\n"));
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smb_read_error = READ_EOF;
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return -1;
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}
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if (readret == -1) {
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/* the descriptor is probably dead */
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DEBUG(0,("read_socket_with_timeout: timeout read. read error = %s.\n", strerror(errno) ));
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smb_read_error = READ_ERROR;
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return -1;
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}
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nread += readret;
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}
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/* Return the number we got */
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return (ssize_t)nread;
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}
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/****************************************************************************
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Read data from a fd with a timout in msec.
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mincount = if timeout, minimum to read before returning
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maxcount = number to be read.
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time_out = timeout in milliseconds
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****************************************************************************/
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ssize_t read_with_timeout(int fd, char *buf, size_t mincnt, size_t maxcnt,
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unsigned int time_out)
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{
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ssize_t readret;
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size_t nread = 0;
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/* just checking .... */
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if (maxcnt <= 0)
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return(0);
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/* Blocking read */
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if (time_out <= 0) {
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if (mincnt == 0) mincnt = maxcnt;
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while (nread < mincnt) {
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readret = sys_read(fd, buf + nread, maxcnt - nread);
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if (readret <= 0)
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return readret;
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nread += readret;
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}
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return((ssize_t)nread);
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}
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/* Most difficult - timeout read */
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/* If this is ever called on a disk file and
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mincnt is greater then the filesize then
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system performance will suffer severely as
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select always returns true on disk files */
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for (nread=0; nread < mincnt; ) {
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int selrtn = read_data_outstanding(fd, time_out);
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if(selrtn <= 0)
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return selrtn;
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readret = sys_read(fd, buf+nread, maxcnt-nread);
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if (readret <= 0)
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return readret;
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nread += readret;
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}
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/* Return the number we got */
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return((ssize_t)nread);
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}
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/****************************************************************************
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read data from the client, reading exactly N bytes.
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****************************************************************************/
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ssize_t read_data(int fd,char *buffer,size_t N)
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{
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ssize_t ret;
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size_t total=0;
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smb_read_error = 0;
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while (total < N) {
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ret = sys_read(fd,buffer + total,N - total);
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if (ret == 0) {
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DEBUG(10,("read_data: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
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smb_read_error = READ_EOF;
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return 0;
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}
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if (ret == -1) {
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DEBUG(0,("read_data: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
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smb_read_error = READ_ERROR;
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return -1;
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}
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total += ret;
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}
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return (ssize_t)total;
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}
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/****************************************************************************
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Read data from a socket, reading exactly N bytes.
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****************************************************************************/
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static ssize_t read_socket_data(int fd,char *buffer,size_t N)
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{
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ssize_t ret;
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size_t total=0;
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smb_read_error = 0;
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while (total < N) {
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ret = sys_read(fd,buffer + total,N - total);
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if (ret == 0) {
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DEBUG(10,("read_socket_data: recv of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
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smb_read_error = READ_EOF;
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return 0;
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}
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if (ret == -1) {
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DEBUG(0,("read_socket_data: recv failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
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smb_read_error = READ_ERROR;
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return -1;
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}
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total += ret;
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}
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return (ssize_t)total;
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}
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/****************************************************************************
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Write data to a fd.
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****************************************************************************/
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ssize_t write_data(int fd,char *buffer,size_t N)
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{
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size_t total=0;
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ssize_t ret;
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while (total < N) {
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ret = sys_write(fd,buffer + total,N - total);
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if (ret == -1) {
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DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) ));
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return -1;
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}
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if (ret == 0)
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return total;
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total += ret;
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}
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return (ssize_t)total;
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}
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/****************************************************************************
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Write data to a socket - use send rather than write.
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****************************************************************************/
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static ssize_t write_socket_data(int fd,char *buffer,size_t N)
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{
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size_t total=0;
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ssize_t ret;
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while (total < N) {
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ret = sys_send(fd,buffer + total,N - total,0);
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if (ret == -1) {
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DEBUG(0,("write_socket_data: write failure. Error = %s\n", strerror(errno) ));
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return -1;
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}
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if (ret == 0)
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return total;
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total += ret;
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}
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return (ssize_t)total;
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}
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/****************************************************************************
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write to a socket
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****************************************************************************/
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ssize_t write_socket(int fd,char *buf,size_t len)
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{
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ssize_t ret=0;
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DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
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ret = write_socket_data(fd,buf,len);
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DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
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if(ret <= 0)
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DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
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(int)len, fd, strerror(errno) ));
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return(ret);
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}
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/****************************************************************************
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send a keepalive packet (rfc1002)
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|
****************************************************************************/
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BOOL send_keepalive(int client)
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{
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unsigned char buf[4];
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buf[0] = SMBkeepalive;
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buf[1] = buf[2] = buf[3] = 0;
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return(write_socket_data(client,(char *)buf,4) == 4);
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}
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|
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/****************************************************************************
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|
read 4 bytes of a smb packet and return the smb length of the packet
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store the result in the buffer
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This version of the function will return a length of zero on receiving
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a keepalive packet.
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timeout is in milliseconds.
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****************************************************************************/
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static ssize_t read_smb_length_return_keepalive(int fd,char *inbuf,unsigned int timeout)
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{
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ssize_t len=0;
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int msg_type;
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BOOL ok = False;
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while (!ok) {
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if (timeout > 0)
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ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout) == 4);
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else
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ok = (read_socket_data(fd,inbuf,4) == 4);
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|
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if (!ok)
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return(-1);
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len = smb_len(inbuf);
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msg_type = CVAL(inbuf,0);
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|
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if (msg_type == SMBkeepalive)
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DEBUG(5,("Got keepalive packet\n"));
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}
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DEBUG(10,("got smb length of %d\n",len));
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|
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return(len);
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}
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|
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/****************************************************************************
|
|
read 4 bytes of a smb packet and return the smb length of the packet
|
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store the result in the buffer. This version of the function will
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|
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 %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"));
|
|
|
|
/*
|
|
* 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! (%d bytes).\n",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;
|
|
}
|
|
}
|
|
|
|
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. (%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 = 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(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;
|
|
}
|
|
|
|
/*
|
|
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_socket_name(client_fd);
|
|
}
|
|
|
|
char *client_addr(void)
|
|
{
|
|
return get_socket_addr(client_fd);
|
|
}
|
|
|
|
/*******************************************************************
|
|
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 (strcasecmp(remotehost, hp->h_name)
|
|
&& strcasecmp(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], (caddr_t) & 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_socket_name(int fd)
|
|
{
|
|
static pstring name_buf;
|
|
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()) {
|
|
return get_socket_addr(fd);
|
|
}
|
|
|
|
p = get_socket_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");
|
|
}
|
|
}
|
|
|
|
alpha_strcpy(name_buf, name_buf, "_-.", 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_socket_addr(int fd)
|
|
{
|
|
struct sockaddr sa;
|
|
struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
|
|
int 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 unixen 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)
|
|
{
|
|
struct sockaddr_un sunaddr;
|
|
struct stat st;
|
|
int sock;
|
|
mode_t old_umask;
|
|
pstring path;
|
|
|
|
/* 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)));
|
|
return -1;
|
|
}
|
|
|
|
} else {
|
|
|
|
DEBUG(0, ("lstat failed on socket directory %s: %s\n",
|
|
socket_dir, strerror(errno)));
|
|
return -1;
|
|
}
|
|
|
|
} 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));
|
|
return -1;
|
|
}
|
|
|
|
if ((st.st_uid != sec_initial_uid()) ||
|
|
((st.st_mode & 0777) != dir_perms)) {
|
|
DEBUG(0, ("invalid permissions on socket directory "
|
|
"%s\n", socket_dir));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Create the socket file */
|
|
|
|
old_umask = umask(0);
|
|
|
|
sock = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
|
|
if (sock == -1) {
|
|
perror("socket");
|
|
umask(old_umask);
|
|
return -1;
|
|
}
|
|
|
|
snprintf(path, sizeof(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)));
|
|
close(sock);
|
|
umask(old_umask);
|
|
return -1;
|
|
}
|
|
|
|
if (listen(sock, 5) == -1) {
|
|
DEBUG(0, ("listen failed on pipe socket %s: %s\n",
|
|
path,
|
|
strerror(errno)));
|
|
close(sock);
|
|
umask(old_umask);
|
|
return -1;
|
|
}
|
|
|
|
umask(old_umask);
|
|
|
|
/* Success! */
|
|
|
|
return sock;
|
|
}
|
|
|
|
/*******************************************************************
|
|
this is like socketpair but uses tcp. It is used by the Samba
|
|
regression test code
|
|
The function guarantees that nobody else can attach to the socket,
|
|
or if they do that this function fails and the socket gets closed
|
|
returns 0 on success, -1 on failure
|
|
the resulting file descriptors are symmetrical
|
|
******************************************************************/
|
|
static int socketpair_tcp(int fd[2])
|
|
{
|
|
int listener;
|
|
struct sockaddr_in sock;
|
|
struct sockaddr_in sock2;
|
|
socklen_t socklen = sizeof(sock);
|
|
int connect_done = 0;
|
|
|
|
fd[0] = fd[1] = listener = -1;
|
|
|
|
memset(&sock, 0, sizeof(sock));
|
|
|
|
if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed;
|
|
|
|
memset(&sock2, 0, sizeof(sock2));
|
|
#ifdef HAVE_SOCK_SIN_LEN
|
|
sock2.sin_len = sizeof(sock2);
|
|
#endif
|
|
sock2.sin_family = PF_INET;
|
|
|
|
bind(listener, (struct sockaddr *)&sock2, sizeof(sock2));
|
|
|
|
if (listen(listener, 1) != 0) goto failed;
|
|
|
|
if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed;
|
|
|
|
if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed;
|
|
|
|
set_blocking(fd[1], 0);
|
|
|
|
sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
|
|
|
if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) {
|
|
if (errno != EINPROGRESS) goto failed;
|
|
} else {
|
|
connect_done = 1;
|
|
}
|
|
|
|
if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed;
|
|
|
|
close(listener);
|
|
if (connect_done == 0) {
|
|
if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0
|
|
&& errno != EISCONN) goto failed;
|
|
}
|
|
|
|
set_blocking(fd[1], 1);
|
|
|
|
/* all OK! */
|
|
return 0;
|
|
|
|
failed:
|
|
if (fd[0] != -1) close(fd[0]);
|
|
if (fd[1] != -1) close(fd[1]);
|
|
if (listener != -1) close(listener);
|
|
return -1;
|
|
}
|
|
|
|
|
|
/*******************************************************************
|
|
run a program on a local tcp socket, this is used to launch smbd
|
|
when regression testing
|
|
the return value is a socket which is attached to a subprocess
|
|
running "prog". stdin and stdout are attached. stderr is left
|
|
attached to the original stderr
|
|
******************************************************************/
|
|
int sock_exec(const char *prog)
|
|
{
|
|
int fd[2];
|
|
if (socketpair_tcp(fd) != 0) {
|
|
DEBUG(0,("socketpair_tcp failed (%s)\n", strerror(errno)));
|
|
return -1;
|
|
}
|
|
if (fork() == 0) {
|
|
close(fd[0]);
|
|
close(0);
|
|
close(1);
|
|
dup(fd[1]);
|
|
dup(fd[1]);
|
|
exit(system(prog));
|
|
}
|
|
close(fd[1]);
|
|
return fd[0];
|
|
}
|