/* UNIX RFCNB (RFC1001/RFC1002) NEtBIOS implementation
Version 1.0
RFCNB IO Routines ...
Copyright (C) Richard Sharpe 1996
*/
/*
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 <features.h> */
#include "std-includes.h"
#include "rfcnb-priv.h"
#include "rfcnb-util.h"
#include "rfcnb-io.h"
#include <sys/uio.h>
#include <sys/signal.h>
#include <string.h>
int RFCNB_Timeout = 0; /* Timeout in seconds ... */
void rfcnb_alarm(int sig)
{
fprintf(stderr, "IO Timed out ...\n");
}
/* Set timeout value and setup signal handling */
int RFCNB_Set_Timeout(int seconds)
{
int temp;
/* If we are on a Bezerkeley system, use sigvec, else sigaction */
#ifndef SA_RESTART
struct sigvec invec, outvec;
#else
struct sigaction inact, outact;
#endif
RFCNB_Timeout = seconds;
if (RFCNB_Timeout > 0) { /* Set up handler to ignore but not restart */
#ifndef SA_RESTART
invec.sv_handler = (void (*)())rfcnb_alarm;
invec.sv_mask = 0;
invec.sv_flags = SV_INTERRUPT;
if (sigvec(SIGALRM, &invec, &outvec) < 0)
return(-1);
#else
inact.sa_handler = (void (*)())rfcnb_alarm;
sigemptyset(&inact.sa_mask);
inact.sa_flags = 0; /* Don't restart */
if (sigaction(SIGALRM, &inact, &outact) < 0)
return(-1);
#endif
}
return(0);
}
/* Discard the rest of an incoming packet as we do not have space for it
in the buffer we allocated or were passed ... */
int RFCNB_Discard_Rest(struct RFCNB_Con *con, int len)
{ char temp[100]; /* Read into here */
int rest, this_read, bytes_read;
/* len is the amount we should read */
#ifdef RFCNB_DEBUG
fprintf(stderr, "Discard_Rest called to discard: %i\n", len);
#endif
rest = len;
while (rest > 0) {
this_read = (rest > sizeof(temp)?sizeof(temp):rest);
bytes_read = read(con -> fd, temp, this_read);
if (bytes_read <= 0) { /* Error so return */
if (bytes_read < 0)
RFCNB_errno = RFCNBE_BadRead;
else
RFCNB_errno = RFCNBE_ConGone;
RFCNB_saved_errno = errno;
return(RFCNBE_Bad);
}
rest = rest - bytes_read;
}
return(0);
}
/* Send an RFCNB packet to the connection.
We just send each of the blocks linked together ...
If we can, try to send it as one iovec ...
*/
int RFCNB_Put_Pkt(struct RFCNB_Con *con, struct RFCNB_Pkt *pkt, int len)
{ int len_sent, tot_sent, this_len;
struct RFCNB_Pkt *pkt_ptr;
char *this_data;
int i;
struct iovec io_list[10]; /* We should never have more */
/* If we do, this will blow up ...*/
/* Try to send the data ... We only send as many bytes as len claims */
/* We should try to stuff it into an IOVEC and send as one write */
pkt_ptr = pkt;
len_sent = tot_sent = 0; /* Nothing sent so far */
i = 0;
while ((pkt_ptr != NULL) & (i < 10)) { /* Watch that magic number! */
this_len = pkt_ptr -> len;
this_data = pkt_ptr -> data;
if ((tot_sent + this_len) > len)
this_len = len - tot_sent; /* Adjust so we don't send too much */
/* Now plug into the iovec ... */
io_list[i].iov_len = this_len;
io_list[i].iov_base = this_data;
i++;
tot_sent += this_len;
if (tot_sent == len) break; /* Let's not send too much */
pkt_ptr = pkt_ptr -> next;
}
#ifdef RFCNB_DEBUG
fprintf(stderr, "Frags = %i, tot_sent = %i\n", i, tot_sent);
#endif
/* Set up an alarm if timeouts are set ... */
if (RFCNB_Timeout > 0)
alarm(RFCNB_Timeout);
if ((len_sent = writev(con -> fd, io_list, i)) < 0) { /* An error */
con -> rfc_errno = errno;
if (errno == EINTR) /* We were interrupted ... */
RFCNB_errno = RFCNBE_Timeout;
else
RFCNB_errno = RFCNBE_BadWrite;
RFCNB_saved_errno = errno;
return(RFCNBE_Bad);
}
if (len_sent < tot_sent) { /* Less than we wanted */
if (errno == EINTR) /* We were interrupted */
RFCNB_errno = RFCNBE_Timeout;
else
RFCNB_errno = RFCNBE_BadWrite;
RFCNB_saved_errno = errno;
return(RFCNBE_Bad);
}
if (RFCNB_Timeout > 0)
alarm(0); /* Reset that sucker */
#ifdef RFCNB_DEBUG
fprintf(stderr, "Len sent = %i ...\n", len_sent);
RFCNB_Print_Pkt(stderr, "sent", pkt, len_sent); /* Print what send ... */
#endif
return(len_sent);
}
/* Read an RFCNB packet off the connection.
We read the first 4 bytes, that tells us the length, then read the
rest. We should implement a timeout, but we don't just yet
*/
int RFCNB_Get_Pkt(struct RFCNB_Con *con, struct RFCNB_Pkt *pkt, int len)
{ int read_len, pkt_len;
char hdr[RFCNB_Pkt_Hdr_Len]; /* Local space for the header */
struct RFCNB_Pkt *pkt_frag;
int more, this_time, offset, frag_len, this_len;
BOOL seen_keep_alive = TRUE;
/* Read that header straight into the buffer */
if (len < RFCNB_Pkt_Hdr_Len) { /* What a bozo */
#ifdef RFCNB_DEBUG
fprintf(stderr, "Trying to read less than a packet:");
perror("");
#endif
RFCNB_errno = RFCNBE_BadParam;
return(RFCNBE_Bad);
}
/* We discard keep alives here ... */
if (RFCNB_Timeout > 0)
alarm(RFCNB_Timeout);
while (seen_keep_alive) {
if ((read_len = read(con -> fd, hdr, sizeof(hdr))) < 0) { /* Problems */
#ifdef RFCNB_DEBUG
fprintf(stderr, "Reading the packet, we got:");
perror("");
#endif
if (errno == EINTR)
RFCNB_errno = RFCNBE_Timeout;
else
RFCNB_errno = RFCNBE_BadRead;
RFCNB_saved_errno = errno;
return(RFCNBE_Bad);
}
/* Now we check out what we got */
if (read_len == 0) { /* Connection closed, send back eof? */
#ifdef RFCNB_DEBUG
fprintf(stderr, "Connection closed reading\n");
#endif
if (errno == EINTR)
RFCNB_errno = RFCNBE_Timeout;
else
RFCNB_errno = RFCNBE_ConGone;
RFCNB_saved_errno = errno;
return(RFCNBE_Bad);
}
if (RFCNB_Pkt_Type(hdr) == RFCNB_SESSION_KEEP_ALIVE) {
#ifdef RFCNB_DEBUG
fprintf(stderr, "RFCNB KEEP ALIVE received\n");
#endif
}
else {
seen_keep_alive = FALSE;
}
}
/* What if we got less than or equal to a hdr size in bytes? */
if (read_len < sizeof(hdr)) { /* We got a small packet */
/* Now we need to copy the hdr portion we got into the supplied packet */
memcpy(pkt -> data, hdr, read_len); /*Copy data */
#ifdef RFCNB_DEBUG
RFCNB_Print_Pkt(stderr, "rcvd", pkt, read_len);
#endif
return(read_len);
}
/* Now, if we got at least a hdr size, alloc space for rest, if we need it */
pkt_len = RFCNB_Pkt_Len(hdr);
#ifdef RFCNB_DEBUG
fprintf(stderr, "Reading Pkt: Length = %i\n", pkt_len);
#endif
/* Now copy in the hdr */
memcpy(pkt -> data, hdr, sizeof(hdr));
/* Get the rest of the packet ... first figure out how big our buf is? */
/* And make sure that we handle the fragments properly ... Sure should */
/* use an iovec ... */
if (len < pkt_len) /* Only get as much as we have space for */
more = len - RFCNB_Pkt_Hdr_Len;
else
more = pkt_len;
this_time = 0;
/* We read for each fragment ... */
if (pkt -> len == read_len){ /* If this frag was exact size */
pkt_frag = pkt -> next; /* Stick next lot in next frag */
offset = 0; /* then we start at 0 in next */
}
else {
pkt_frag = pkt; /* Otherwise use rest of this frag */
offset = RFCNB_Pkt_Hdr_Len; /* Otherwise skip the header */
}
frag_len = pkt_frag -> len;
if (more <= frag_len) /* If len left to get less than frag space */
this_len = more; /* Get the rest ... */
else
this_len = frag_len - offset;
while (more > 0) {
if ((this_time = read(con -> fd, (pkt_frag -> data) + offset, this_len)) <= 0) { /* Problems */
if (errno == EINTR) {
RFCNB_errno = RFCNB_Timeout;
}
else {
if (this_time < 0)
RFCNB_errno = RFCNBE_BadRead;
else
RFCNB_errno = RFCNBE_ConGone;
}
RFCNB_saved_errno = errno;
return(RFCNBE_Bad);
}
#ifdef RFCNB_DEBUG
fprintf(stderr, "Frag_Len = %i, this_time = %i, this_len = %i, more = %i\n", frag_len,
this_time, this_len, more);
#endif
read_len = read_len + this_time; /* How much have we read ... */
/* Now set up the next part */
if (pkt_frag -> next == NULL) break; /* That's it here */
pkt_frag = pkt_frag -> next;
this_len = pkt_frag -> len;
offset = 0;
more = more - this_time;
}
#ifdef RFCNB_DEBUG
fprintf(stderr,"Pkt Len = %i, read_len = %i\n", pkt_len, read_len);
RFCNB_Print_Pkt(stderr, "rcvd", pkt, read_len + sizeof(hdr));
#endif
if (read_len < (pkt_len + sizeof(hdr))) { /* Discard the rest */
return(RFCNB_Discard_Rest(con, (pkt_len + sizeof(hdr)) - read_len));
}
if (RFCNB_Timeout > 0)
alarm(0); /* Reset that sucker */
return(read_len + sizeof(RFCNB_Hdr));
}