/* * ircd-ratbox: A slightly useful ircd. * linebuf.c: Maintains linebuffers. * * Copyright (C) 2001-2002 Adrian Chadd * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 * USA * * $Id: linebuf.c 26092 2008-09-19 15:13:52Z androsyn $ */ #include #include #include static rb_bh *rb_linebuf_heap; static int bufline_count = 0; #ifndef LINEBUF_HEAP_SIZE #define LINEBUF_HEAP_SIZE 2048 #endif /* * rb_linebuf_init * * Initialise the linebuf mechanism */ void rb_linebuf_init(size_t heap_size) { rb_linebuf_heap = rb_bh_create(sizeof(buf_line_t), heap_size, "librb_linebuf_heap"); } static buf_line_t * rb_linebuf_allocate(void) { buf_line_t *t; t = rb_bh_alloc(rb_linebuf_heap); return (t); } static void rb_linebuf_free(buf_line_t * p) { rb_bh_free(rb_linebuf_heap, p); } /* * rb_linebuf_new_line * * Create a new line, and link it to the given linebuf. * It will be initially empty. */ static buf_line_t * rb_linebuf_new_line(buf_head_t * bufhead) { buf_line_t *bufline; rb_dlink_node *node; bufline = rb_linebuf_allocate(); if(bufline == NULL) return NULL; ++bufline_count; node = rb_make_rb_dlink_node(); /* Stick it at the end of the buf list */ rb_dlinkAddTail(bufline, node, &bufhead->list); bufline->refcount++; /* And finally, update the allocated size */ bufhead->alloclen++; bufhead->numlines++; return bufline; } /* * rb_linebuf_done_line * * We've finished with the given line, so deallocate it */ static void rb_linebuf_done_line(buf_head_t * bufhead, buf_line_t * bufline, rb_dlink_node *node) { /* Remove it from the linked list */ rb_dlinkDestroy(node, &bufhead->list); /* Update the allocated size */ bufhead->alloclen--; bufhead->len -= bufline->len; lrb_assert(bufhead->len >= 0); bufhead->numlines--; bufline->refcount--; lrb_assert(bufline->refcount >= 0); if(bufline->refcount == 0) { /* and finally, deallocate the buf */ --bufline_count; lrb_assert(bufline_count >= 0); rb_linebuf_free(bufline); } } /* * skip to end of line or the crlfs, return the number of bytes .. */ static inline int rb_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; } lrb_assert(orig_len > len); return (orig_len - len); } /* * rb_linebuf_newbuf * * Initialise the new buffer */ void rb_linebuf_newbuf(buf_head_t * bufhead) { /* not much to do right now :) */ memset(bufhead, 0, sizeof(buf_head_t)); } /* * rb_linebuf_donebuf * * Flush all the lines associated with this buffer */ void rb_linebuf_donebuf(buf_head_t * bufhead) { while(bufhead->list.head != NULL) { rb_linebuf_done_line(bufhead, (buf_line_t *) bufhead->list.head->data, bufhead->list.head); } } /* * rb_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 rb_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; lrb_assert(bufline->len < BUF_DATA_SIZE); if(bufline->terminated == 1) return 0; clen = cpylen = rb_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)) { cpylen = BUF_DATA_SIZE - bufline->len - 1; memcpy(bufch, ch, cpylen); 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; } /* * rb_linebuf_copy_raw * * Copy as much data as possible directly into a linebuf, * splitting at \r\n, but without altering any data. * */ static int rb_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; lrb_assert(bufline->len < BUF_DATA_SIZE); if(bufline->terminated == 1) return 0; clen = cpylen = rb_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; } /* * rb_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 rb_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; /* just try, the worst it could do is *reject* us .. */ if(!raw) cpylen = rb_linebuf_copy_line(bufhead, bufline, data, len); else cpylen = rb_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; lrb_assert(len >= 0); data += cpylen; } /* Next, the loop */ while(len > 0) { /* We obviously need a new buffer, so .. */ bufline = rb_linebuf_new_line(bufhead); /* And parse */ if(!raw) cpylen = rb_linebuf_copy_line(bufhead, bufline, data, len); else cpylen = rb_linebuf_copy_raw(bufhead, bufline, data, len); if(cpylen == -1) return -1; len -= cpylen; lrb_assert(len >= 0); data += cpylen; linecnt++; } return linecnt; } /* * rb_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 rb_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! */ if(buflen < bufline->len) cpylen = buflen - 1; else cpylen = bufline->len; /* 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); /* convert CR/LF to NULL */ if(!raw) buf[cpylen] = '\0'; lrb_assert(cpylen >= 0); /* Deallocate the line */ rb_linebuf_done_line(bufhead, bufline, bufhead->list.head); /* return how much we copied */ return cpylen; } /* * rb_linebuf_attach * * attach the lines in a buf_head_t to another buf_head_t * without copying the data (using refcounts). */ void rb_linebuf_attach(buf_head_t * bufhead, buf_head_t * new) { rb_dlink_node *ptr; buf_line_t *line; RB_DLINK_FOREACH(ptr, new->list.head) { line = ptr->data; rb_dlinkAddTailAlloc(line, &bufhead->list); /* Update the allocated size */ bufhead->alloclen++; bufhead->len += line->len; bufhead->numlines++; line->refcount++; } } /* * rb_linebuf_putmsg * * Similar to rb_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 rb_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; lrb_assert(bufline->terminated); } #endif /* Create a new line */ bufline = rb_linebuf_new_line(bufhead); if(prefixfmt != NULL) { va_start(prefix_args, prefixfmt); len = rb_vsnprintf(bufline->buf, BUF_DATA_SIZE, prefixfmt, prefix_args); va_end(prefix_args); } if(va_args != NULL) { len += rb_vsnprintf((bufline->buf + len), (BUF_DATA_SIZE - len), format, *va_args); } bufline->terminated = 1; /* Truncate the data if required */ if(rb_unlikely(len > 510)) { len = 510; bufline->buf[len++] = '\r'; bufline->buf[len++] = '\n'; } else if(rb_unlikely(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; } void rb_linebuf_putbuf(buf_head_t * bufhead, const char *buffer) { buf_line_t *bufline; int len = 0; /* make sure the previous line is terminated */ #ifndef NDEBUG if(bufhead->list.tail) { bufline = bufhead->list.tail->data; lrb_assert(bufline->terminated); } #endif /* Create a new line */ bufline = rb_linebuf_new_line(bufhead); if(rb_unlikely(buffer != NULL)) len = rb_strlcpy(bufline->buf, buffer, BUF_DATA_SIZE); bufline->terminated = 1; /* Truncate the data if required */ if(rb_unlikely(len > 510)) { len = 510; bufline->buf[len++] = '\r'; bufline->buf[len++] = '\n'; } else if(rb_unlikely(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; } void rb_linebuf_put(buf_head_t * bufhead, const char *format, ...) { buf_line_t *bufline; int len = 0; va_list args; /* make sure the previous line is terminated */ #ifndef NDEBUG if(bufhead->list.tail) { bufline = bufhead->list.tail->data; lrb_assert(bufline->terminated); } #endif /* Create a new line */ bufline = rb_linebuf_new_line(bufhead); if(rb_unlikely(format != NULL)) { va_start(args, format); len = rb_vsnprintf(bufline->buf, BUF_DATA_SIZE, format, args); va_end(args); } bufline->terminated = 1; /* Truncate the data if required */ if(rb_unlikely(len > 510)) { len = 510; bufline->buf[len++] = '\r'; bufline->buf[len++] = '\n'; } else if(rb_unlikely(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; } /* * rb_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 rb_linebuf_flush(rb_fde_t *F, buf_head_t * bufhead) { buf_line_t *bufline; int retval; /* * autoconf checks for this..but really just want to use it if we have a * native version even if libircd provides a fake version... */ #ifdef HAVE_WRITEV if(!rb_fd_ssl(F)) { rb_dlink_node *ptr; int x = 0, y; int xret; static struct rb_iovec vec[RB_UIO_MAXIOV]; memset(vec, 0, sizeof(vec)); /* Check we actually have a first buffer */ if(bufhead->list.head == NULL) { /* nope, so we return none .. */ errno = EWOULDBLOCK; return -1; } ptr = bufhead->list.head; bufline = ptr->data; if(!bufline->terminated) { errno = EWOULDBLOCK; return -1; } vec[x].iov_base = bufline->buf + bufhead->writeofs; vec[x++].iov_len = bufline->len - bufhead->writeofs; ptr = ptr->next; do { if(ptr == NULL) break; bufline = ptr->data; if(!bufline->terminated) break; vec[x].iov_base = bufline->buf; vec[x].iov_len = bufline->len; ptr = ptr->next; } while(++x < RB_UIO_MAXIOV); if(x == 0) { errno = EWOULDBLOCK; return -1; } xret = retval = rb_writev(F, vec, x); if(retval <= 0) return retval; ptr = bufhead->list.head; for(y = 0; y < x; y++) { bufline = ptr->data; if(xret >= bufline->len - bufhead->writeofs) { xret -= bufline->len - bufhead->writeofs; ptr = ptr->next; rb_linebuf_done_line(bufhead, bufline, bufhead->list.head); bufhead->writeofs = 0; } else { bufhead->writeofs += xret; break; } } return retval; } #endif /* this is the non-writev case */ /* 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; } /* Now, try writing data */ retval = rb_write(F, bufline->buf + bufhead->writeofs, bufline->len - bufhead->writeofs); 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; lrb_assert(bufhead->len >= 0); rb_linebuf_done_line(bufhead, bufline, bufhead->list.head); } /* Return line length */ return retval; } /* * count linebufs for stats z */ void rb_count_rb_linebuf_memory(size_t *count, size_t *rb_linebuf_memory_used) { rb_bh_usage(rb_linebuf_heap, count, NULL, rb_linebuf_memory_used, NULL); }