687 lines
15 KiB
C
687 lines
15 KiB
C
/*
|
|
* ircd-ratbox: A slightly useful ircd.
|
|
* linebuf.c: Maintains linebuffers.
|
|
*
|
|
* Copyright (C) 2001-2002 Adrian Chadd <adrian@creative.net.au>
|
|
* Copyright (C) 2002 Hybrid Development Team
|
|
* Copyright (C) 2002-2005 ircd-ratbox development team
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*
|
|
* $Id: linebuf.c 1110 2006-03-29 22:55:25Z nenolod $
|
|
*/
|
|
|
|
#include "stdinc.h"
|
|
#include "tools.h"
|
|
#include "client.h"
|
|
#include "linebuf.h"
|
|
#include "memory.h"
|
|
#include "event.h"
|
|
#include "balloc.h"
|
|
#include "hook.h"
|
|
#include "commio.h"
|
|
#include "sprintf_irc.h"
|
|
|
|
#ifdef STRING_WITH_STRINGS
|
|
# include <string.h>
|
|
# include <strings.h>
|
|
#else
|
|
# ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
# else
|
|
# ifdef HAVE_STRINGS_H
|
|
# include <strings.h>
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
extern BlockHeap *linebuf_heap;
|
|
|
|
static int bufline_count = 0;
|
|
|
|
|
|
/*
|
|
* linebuf_init
|
|
*
|
|
* Initialise the linebuf mechanism
|
|
*/
|
|
|
|
|
|
void
|
|
linebuf_init(void)
|
|
{
|
|
linebuf_heap = BlockHeapCreate(sizeof(buf_line_t), LINEBUF_HEAP_SIZE);
|
|
}
|
|
|
|
static buf_line_t *
|
|
linebuf_allocate(void)
|
|
{
|
|
buf_line_t *t;
|
|
t = BlockHeapAlloc(linebuf_heap);
|
|
t->refcount = 0;
|
|
return (t);
|
|
|
|
}
|
|
|
|
static void
|
|
linebuf_free(buf_line_t * p)
|
|
{
|
|
BlockHeapFree(linebuf_heap, p);
|
|
}
|
|
|
|
/*
|
|
* linebuf_new_line
|
|
*
|
|
* Create a new line, and link it to the given linebuf.
|
|
* It will be initially empty.
|
|
*/
|
|
static buf_line_t *
|
|
linebuf_new_line(buf_head_t * bufhead)
|
|
{
|
|
buf_line_t *bufline;
|
|
dlink_node *node;
|
|
|
|
bufline = linebuf_allocate();
|
|
if(bufline == NULL)
|
|
return NULL;
|
|
++bufline_count;
|
|
|
|
|
|
node = make_dlink_node();
|
|
|
|
bufline->len = 0;
|
|
bufline->terminated = 0;
|
|
bufline->flushing = 0;
|
|
bufline->raw = 0;
|
|
|
|
/* Stick it at the end of the buf list */
|
|
dlinkAddTail(bufline, node, &bufhead->list);
|
|
bufline->refcount++;
|
|
|
|
/* And finally, update the allocated size */
|
|
bufhead->alloclen++;
|
|
bufhead->numlines++;
|
|
|
|
return bufline;
|
|
}
|
|
|
|
|
|
/*
|
|
* linebuf_done_line
|
|
*
|
|
* We've finished with the given line, so deallocate it
|
|
*/
|
|
static void
|
|
linebuf_done_line(buf_head_t * bufhead, buf_line_t * bufline, dlink_node * node)
|
|
{
|
|
/* Remove it from the linked list */
|
|
dlinkDestroy(node, &bufhead->list);
|
|
|
|
/* Update the allocated size */
|
|
bufhead->alloclen--;
|
|
bufhead->len -= bufline->len;
|
|
s_assert(bufhead->len >= 0);
|
|
bufhead->numlines--;
|
|
|
|
bufline->refcount--;
|
|
s_assert(bufline->refcount >= 0);
|
|
|
|
if(bufline->refcount == 0)
|
|
{
|
|
/* and finally, deallocate the buf */
|
|
--bufline_count;
|
|
s_assert(bufline_count >= 0);
|
|
linebuf_free(bufline);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* skip to end of line or the crlfs, return the number of bytes ..
|
|
*/
|
|
static inline int
|
|
linebuf_skip_crlf(char *ch, int len)
|
|
{
|
|
int orig_len = len;
|
|
|
|
/* First, skip until the first non-CRLF */
|
|
for (; len; len--, ch++)
|
|
{
|
|
if(*ch == '\r')
|
|
break;
|
|
else if(*ch == '\n')
|
|
break;
|
|
}
|
|
|
|
/* Then, skip until the last CRLF */
|
|
for (; len; len--, ch++)
|
|
{
|
|
if((*ch != '\r') && (*ch != '\n'))
|
|
break;
|
|
}
|
|
s_assert(orig_len > len);
|
|
return (orig_len - len);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* linebuf_newbuf
|
|
*
|
|
* Initialise the new buffer
|
|
*/
|
|
void
|
|
linebuf_newbuf(buf_head_t * bufhead)
|
|
{
|
|
/* not much to do right now :) */
|
|
memset(bufhead, 0, sizeof(buf_head_t));
|
|
}
|
|
|
|
/*
|
|
* client_flush_input
|
|
*
|
|
* inputs - pointer to client
|
|
* output - none
|
|
* side effects - all input line bufs are flushed
|
|
*/
|
|
void
|
|
client_flush_input(struct Client *client_p)
|
|
{
|
|
/* This way, it can be called for remote client as well */
|
|
|
|
if(client_p->localClient == NULL)
|
|
return;
|
|
|
|
linebuf_donebuf(&client_p->localClient->buf_recvq);
|
|
}
|
|
|
|
|
|
/*
|
|
* linebuf_donebuf
|
|
*
|
|
* Flush all the lines associated with this buffer
|
|
*/
|
|
void
|
|
linebuf_donebuf(buf_head_t * bufhead)
|
|
{
|
|
while (bufhead->list.head != NULL)
|
|
{
|
|
linebuf_done_line(bufhead,
|
|
(buf_line_t *) bufhead->list.head->data, bufhead->list.head);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* linebuf_copy_line
|
|
*
|
|
* Okay..this functions comments made absolutely no sense.
|
|
*
|
|
* Basically what we do is this. Find the first chunk of text
|
|
* and then scan for a CRLF. If we didn't find it, but we didn't
|
|
* overflow our buffer..we wait for some more data.
|
|
* If we found a CRLF, we replace them with a \0 character.
|
|
* If we overflowed, we copy the most our buffer can handle, terminate
|
|
* it with a \0 and return.
|
|
*
|
|
* The return value is the amount of data we consumed. This could
|
|
* be different than the size of the linebuffer, as when we discard
|
|
* the overflow, we don't want to process it again.
|
|
*
|
|
* This still sucks in my opinion, but it seems to work.
|
|
*
|
|
* -Aaron
|
|
*/
|
|
static int
|
|
linebuf_copy_line(buf_head_t * bufhead, buf_line_t * bufline, char *data, int len)
|
|
{
|
|
int cpylen = 0; /* how many bytes we've copied */
|
|
char *ch = data; /* Pointer to where we are in the read data */
|
|
char *bufch = bufline->buf + bufline->len;
|
|
int clen = 0; /* how many bytes we've processed,
|
|
and don't ever want to see again.. */
|
|
|
|
/* If its full or terminated, ignore it */
|
|
|
|
bufline->raw = 0;
|
|
s_assert(bufline->len < BUF_DATA_SIZE);
|
|
if(bufline->terminated == 1)
|
|
return 0;
|
|
|
|
clen = cpylen = linebuf_skip_crlf(ch, len);
|
|
if(clen == -1)
|
|
return -1;
|
|
|
|
/* This is the ~overflow case..This doesn't happen often.. */
|
|
if(cpylen > (BUF_DATA_SIZE - bufline->len - 1))
|
|
{
|
|
memcpy(bufch, ch, (BUF_DATA_SIZE - bufline->len - 1));
|
|
bufline->buf[BUF_DATA_SIZE - 1] = '\0';
|
|
bufch = bufline->buf + BUF_DATA_SIZE - 2;
|
|
while (cpylen && (*bufch == '\r' || *bufch == '\n'))
|
|
{
|
|
*bufch = '\0';
|
|
cpylen--;
|
|
bufch--;
|
|
}
|
|
bufline->terminated = 1;
|
|
bufline->len = BUF_DATA_SIZE - 1;
|
|
bufhead->len += BUF_DATA_SIZE - 1;
|
|
return clen;
|
|
}
|
|
|
|
memcpy(bufch, ch, cpylen);
|
|
bufch += cpylen;
|
|
*bufch = '\0';
|
|
bufch--;
|
|
|
|
if(*bufch != '\r' && *bufch != '\n')
|
|
{
|
|
/* No linefeed, bail for the next time */
|
|
bufhead->len += cpylen;
|
|
bufline->len += cpylen;
|
|
bufline->terminated = 0;
|
|
return clen;
|
|
}
|
|
|
|
/* Yank the CRLF off this, replace with a \0 */
|
|
while (cpylen && (*bufch == '\r' || *bufch == '\n'))
|
|
{
|
|
*bufch = '\0';
|
|
cpylen--;
|
|
bufch--;
|
|
}
|
|
|
|
bufline->terminated = 1;
|
|
bufhead->len += cpylen;
|
|
bufline->len += cpylen;
|
|
return clen;
|
|
}
|
|
|
|
/*
|
|
* linebuf_copy_raw
|
|
*
|
|
* Copy as much data as possible directly into a linebuf,
|
|
* splitting at \r\n, but without altering any data.
|
|
*
|
|
*/
|
|
static int
|
|
linebuf_copy_raw(buf_head_t * bufhead, buf_line_t * bufline, char *data, int len)
|
|
{
|
|
int cpylen = 0; /* how many bytes we've copied */
|
|
char *ch = data; /* Pointer to where we are in the read data */
|
|
char *bufch = bufline->buf + bufline->len;
|
|
int clen = 0; /* how many bytes we've processed,
|
|
and don't ever want to see again.. */
|
|
|
|
/* If its full or terminated, ignore it */
|
|
|
|
bufline->raw = 1;
|
|
s_assert(bufline->len < BUF_DATA_SIZE);
|
|
if(bufline->terminated == 1)
|
|
return 0;
|
|
|
|
clen = cpylen = linebuf_skip_crlf(ch, len);
|
|
if(clen == -1)
|
|
return -1;
|
|
|
|
/* This is the overflow case..This doesn't happen often.. */
|
|
if(cpylen > (BUF_DATA_SIZE - bufline->len - 1))
|
|
{
|
|
clen = BUF_DATA_SIZE - bufline->len - 1;
|
|
memcpy(bufch, ch, clen);
|
|
bufline->buf[BUF_DATA_SIZE - 1] = '\0';
|
|
bufch = bufline->buf + BUF_DATA_SIZE - 2;
|
|
bufline->terminated = 1;
|
|
bufline->len = BUF_DATA_SIZE - 1;
|
|
bufhead->len += BUF_DATA_SIZE - 1;
|
|
return clen;
|
|
}
|
|
|
|
memcpy(bufch, ch, cpylen);
|
|
bufch += cpylen;
|
|
*bufch = '\0';
|
|
bufch--;
|
|
|
|
if(*bufch != '\r' && *bufch != '\n')
|
|
{
|
|
/* No linefeed, bail for the next time */
|
|
bufhead->len += cpylen;
|
|
bufline->len += cpylen;
|
|
bufline->terminated = 0;
|
|
return clen;
|
|
}
|
|
|
|
bufline->terminated = 1;
|
|
bufhead->len += cpylen;
|
|
bufline->len += cpylen;
|
|
return clen;
|
|
}
|
|
|
|
|
|
/*
|
|
* linebuf_parse
|
|
*
|
|
* Take a given buffer and break out as many buffers as we can.
|
|
* If we find a CRLF, we terminate that buffer and create a new one.
|
|
* If we don't find a CRLF whilst parsing a buffer, we don't mark it
|
|
* 'finished', so the next loop through we can continue appending ..
|
|
*
|
|
* A few notes here, which you'll need to understand before continuing.
|
|
*
|
|
* - right now I'm only dealing with single sized buffers. Later on,
|
|
* I might consider chaining buffers together to get longer "lines"
|
|
* but seriously, I don't see the advantage right now.
|
|
*
|
|
* - This *is* designed to turn into a reference-counter-protected setup
|
|
* to dodge copious copies.
|
|
*/
|
|
int
|
|
linebuf_parse(buf_head_t * bufhead, char *data, int len, int raw)
|
|
{
|
|
buf_line_t *bufline;
|
|
int cpylen;
|
|
int linecnt = 0;
|
|
|
|
/* First, if we have a partial buffer, try to squeze data into it */
|
|
if(bufhead->list.tail != NULL)
|
|
{
|
|
/* Check we're doing the partial buffer thing */
|
|
bufline = bufhead->list.tail->data;
|
|
s_assert(!bufline->flushing);
|
|
/* just try, the worst it could do is *reject* us .. */
|
|
if(!raw)
|
|
cpylen = linebuf_copy_line(bufhead, bufline, data, len);
|
|
else
|
|
cpylen = linebuf_copy_raw(bufhead, bufline, data, len);
|
|
|
|
if(cpylen == -1)
|
|
return -1;
|
|
|
|
linecnt++;
|
|
/* If we've copied the same as what we've got, quit now */
|
|
if(cpylen == len)
|
|
return linecnt; /* all the data done so soon? */
|
|
|
|
/* Skip the data and update len .. */
|
|
len -= cpylen;
|
|
s_assert(len >= 0);
|
|
data += cpylen;
|
|
}
|
|
|
|
/* Next, the loop */
|
|
while (len > 0)
|
|
{
|
|
/* We obviously need a new buffer, so .. */
|
|
bufline = linebuf_new_line(bufhead);
|
|
|
|
/* And parse */
|
|
if(!raw)
|
|
cpylen = linebuf_copy_line(bufhead, bufline, data, len);
|
|
else
|
|
cpylen = linebuf_copy_raw(bufhead, bufline, data, len);
|
|
|
|
if(cpylen == -1)
|
|
return -1;
|
|
|
|
len -= cpylen;
|
|
s_assert(len >= 0);
|
|
data += cpylen;
|
|
linecnt++;
|
|
}
|
|
return linecnt;
|
|
}
|
|
|
|
|
|
/*
|
|
* linebuf_get
|
|
*
|
|
* get the next buffer from our line. For the time being it will copy
|
|
* data into the given buffer and free the underlying linebuf.
|
|
*/
|
|
int
|
|
linebuf_get(buf_head_t * bufhead, char *buf, int buflen, int partial, int raw)
|
|
{
|
|
buf_line_t *bufline;
|
|
int cpylen;
|
|
char *start, *ch;
|
|
|
|
/* make sure we have a line */
|
|
if(bufhead->list.head == NULL)
|
|
return 0; /* Obviously not.. hrm. */
|
|
|
|
bufline = bufhead->list.head->data;
|
|
|
|
/* make sure that the buffer was actually *terminated */
|
|
if(!(partial || bufline->terminated))
|
|
return 0; /* Wait for more data! */
|
|
|
|
/* make sure we've got the space, including the NULL */
|
|
cpylen = bufline->len;
|
|
s_assert(cpylen + 1 <= buflen);
|
|
|
|
/* Copy it */
|
|
start = bufline->buf;
|
|
|
|
/* if we left extraneous '\r\n' characters in the string,
|
|
* and we don't want to read the raw data, clean up the string.
|
|
*/
|
|
if(bufline->raw && !raw)
|
|
{
|
|
/* skip leading EOL characters */
|
|
while (cpylen && (*start == '\r' || *start == '\n'))
|
|
{
|
|
start++;
|
|
cpylen--;
|
|
}
|
|
/* skip trailing EOL characters */
|
|
ch = &start[cpylen - 1];
|
|
while (cpylen && (*ch == '\r' || *ch == '\n'))
|
|
{
|
|
ch--;
|
|
cpylen--;
|
|
}
|
|
}
|
|
memcpy(buf, start, cpylen + 1);
|
|
|
|
/* convert CR/LF to NULL */
|
|
if(bufline->raw && !raw)
|
|
buf[cpylen] = '\0';
|
|
|
|
s_assert(cpylen >= 0);
|
|
|
|
/* Deallocate the line */
|
|
linebuf_done_line(bufhead, bufline, bufhead->list.head);
|
|
|
|
/* return how much we copied */
|
|
return cpylen;
|
|
}
|
|
|
|
/*
|
|
* linebuf_attach
|
|
*
|
|
* attach the lines in a buf_head_t to another buf_head_t
|
|
* without copying the data (using refcounts).
|
|
*/
|
|
void
|
|
linebuf_attach(buf_head_t * bufhead, buf_head_t * new)
|
|
{
|
|
dlink_node *ptr;
|
|
buf_line_t *line;
|
|
|
|
DLINK_FOREACH(ptr, new->list.head)
|
|
{
|
|
line = ptr->data;
|
|
dlinkAddTailAlloc(line, &bufhead->list);
|
|
|
|
/* Update the allocated size */
|
|
bufhead->alloclen++;
|
|
bufhead->len += line->len;
|
|
bufhead->numlines++;
|
|
|
|
line->refcount++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* linebuf_putmsg
|
|
*
|
|
* Similar to linebuf_put, but designed for use by send.c.
|
|
*
|
|
* prefixfmt is used as a format for the varargs, and is inserted first.
|
|
* Then format/va_args is appended to the buffer.
|
|
*/
|
|
void
|
|
linebuf_putmsg(buf_head_t * bufhead, const char *format, va_list * va_args,
|
|
const char *prefixfmt, ...)
|
|
{
|
|
buf_line_t *bufline;
|
|
int len = 0;
|
|
va_list prefix_args;
|
|
|
|
/* make sure the previous line is terminated */
|
|
#ifndef NDEBUG
|
|
if(bufhead->list.tail)
|
|
{
|
|
bufline = bufhead->list.tail->data;
|
|
s_assert(bufline->terminated);
|
|
}
|
|
#endif
|
|
/* Create a new line */
|
|
bufline = linebuf_new_line(bufhead);
|
|
|
|
if(prefixfmt != NULL)
|
|
{
|
|
va_start(prefix_args, prefixfmt);
|
|
len = ircvsnprintf(bufline->buf, BUF_DATA_SIZE, prefixfmt, prefix_args);
|
|
va_end(prefix_args);
|
|
}
|
|
|
|
if(va_args != NULL)
|
|
{
|
|
len += ircvsnprintf((bufline->buf + len), (BUF_DATA_SIZE - len), format, *va_args);
|
|
}
|
|
|
|
bufline->terminated = 1;
|
|
|
|
/* Truncate the data if required */
|
|
if(len > 510)
|
|
{
|
|
len = 510;
|
|
bufline->buf[len++] = '\r';
|
|
bufline->buf[len++] = '\n';
|
|
}
|
|
else if(len == 0)
|
|
{
|
|
bufline->buf[len++] = '\r';
|
|
bufline->buf[len++] = '\n';
|
|
bufline->buf[len] = '\0';
|
|
}
|
|
else
|
|
{
|
|
/* Chop trailing CRLF's .. */
|
|
while ((bufline->buf[len] == '\r')
|
|
|| (bufline->buf[len] == '\n') || (bufline->buf[len] == '\0'))
|
|
{
|
|
len--;
|
|
}
|
|
|
|
bufline->buf[++len] = '\r';
|
|
bufline->buf[++len] = '\n';
|
|
bufline->buf[++len] = '\0';
|
|
}
|
|
|
|
bufline->len = len;
|
|
bufhead->len += len;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* linebuf_flush
|
|
*
|
|
* Flush data to the buffer. It tries to write as much data as possible
|
|
* to the given socket. Any return values are passed straight through.
|
|
* If there is no data in the socket, EWOULDBLOCK is set as an errno
|
|
* rather than returning 0 (which would map to an EOF..)
|
|
*
|
|
* Notes: XXX We *should* have a clue here when a non-full buffer is arrived.
|
|
* and tag it so that we don't re-schedule another write until
|
|
* we have a CRLF.
|
|
*/
|
|
|
|
int
|
|
linebuf_flush(int fd, buf_head_t * bufhead)
|
|
{
|
|
buf_line_t *bufline;
|
|
int retval;
|
|
/* Check we actually have a first buffer */
|
|
if(bufhead->list.head == NULL)
|
|
{
|
|
/* nope, so we return none .. */
|
|
errno = EWOULDBLOCK;
|
|
return -1;
|
|
}
|
|
|
|
bufline = bufhead->list.head->data;
|
|
|
|
/* And that its actually full .. */
|
|
if(!bufline->terminated)
|
|
{
|
|
errno = EWOULDBLOCK;
|
|
return -1;
|
|
}
|
|
|
|
/* Check we're flushing the first buffer */
|
|
if(!bufline->flushing)
|
|
{
|
|
bufline->flushing = 1;
|
|
bufhead->writeofs = 0;
|
|
}
|
|
|
|
/* Now, try writing data */
|
|
retval = send(fd, bufline->buf + bufhead->writeofs, bufline->len - bufhead->writeofs, 0);
|
|
|
|
if(retval <= 0)
|
|
return retval;
|
|
|
|
/* we've got data, so update the write offset */
|
|
bufhead->writeofs += retval;
|
|
|
|
/* if we've written everything *and* the CRLF, deallocate and update
|
|
bufhead */
|
|
if(bufhead->writeofs == bufline->len)
|
|
{
|
|
bufhead->writeofs = 0;
|
|
s_assert(bufhead->len >= 0);
|
|
linebuf_done_line(bufhead, bufline, bufhead->list.head);
|
|
}
|
|
|
|
/* Return line length */
|
|
return retval;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* count linebufs for stats z
|
|
*/
|
|
|
|
void
|
|
count_linebuf_memory(size_t * count, size_t * linebuf_memory_used)
|
|
{
|
|
BlockHeapUsage(linebuf_heap, count, NULL, linebuf_memory_used);
|
|
}
|