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-rw-r--r--sys/netinet/accf_http.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/sys/netinet/accf_http.c b/sys/netinet/accf_http.c
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+++ b/sys/netinet/accf_http.c
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+/*-
+ * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#define ACCEPT_FILTER_MOD
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/unistd.h>
+#include <sys/file.h>
+#include <sys/fcntl.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/stat.h>
+#include <sys/mbuf.h>
+#include <sys/resource.h>
+#include <sys/sysent.h>
+#include <sys/resourcevar.h>
+
+/*
+ * XXX: doesn't work with 0.9 requests, make a seperate filter
+ * based on this one if you want to decode those.
+ */
+
+/* check for GET */
+static void sohashttpget(struct socket *so, void *arg, int waitflag);
+/* check for end of HTTP request */
+static void soishttpconnected(struct socket *so, void *arg, int waitflag);
+static char sbindex(struct mbuf **mp, int *begin, int end);
+
+static struct accept_filter accf_http_filter = {
+ "httpready",
+ sohashttpget,
+ NULL,
+ NULL
+};
+
+static moduledata_t accf_http_mod = {
+ "accf_http",
+ accept_filt_generic_mod_event,
+ &accf_http_filter
+};
+
+DECLARE_MODULE(accf_http, accf_http_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
+
+
+static char
+sbindex(struct mbuf **mp, int *begin, int end)
+{
+ struct mbuf *m = *mp;
+ int diff = end - *begin + 1;
+
+ while (m->m_len < diff) {
+ *begin += m->m_len;
+ diff -= m->m_len;
+ if (m->m_next) {
+ m = m->m_next;
+ } else if (m->m_nextpkt) {
+ m = m->m_nextpkt;
+ } else {
+ /* only happens if end > data in socket buffer */
+ panic("sbindex: not enough data");
+ }
+ }
+ *mp = m;
+ return *(mtod(m, char *) + diff - 1);
+}
+
+static void
+sohashttpget(struct socket *so, void *arg, int waitflag)
+{
+
+ if ((so->so_state & SS_CANTRCVMORE) == 0) {
+ struct mbuf *m;
+
+ if (so->so_rcv.sb_cc < 6)
+ return;
+ m = so->so_rcv.sb_mb;
+ if (bcmp(mtod(m, char *), "GET ", 4) == 0) {
+ soishttpconnected(so, arg, waitflag);
+ return;
+ }
+ }
+
+ so->so_upcall = NULL;
+ so->so_rcv.sb_flags &= ~SB_UPCALL;
+ soisconnected(so);
+ return;
+}
+
+static void
+soishttpconnected(struct socket *so, void *arg, int waitflag)
+{
+ char a, b, c;
+ struct mbuf *y, *z;
+
+ if ((so->so_state & SS_CANTRCVMORE) == 0) {
+ /* seek to end and keep track of next to last mbuf */
+ y = so->so_rcv.sb_mb;
+ while (y->m_nextpkt)
+ y = y->m_nextpkt;
+ z = y;
+ while (y->m_next) {
+ z = y;
+ y = y->m_next;
+ }
+
+ if (z->m_len + y->m_len > 2) {
+ int index = y->m_len - 1;
+
+ c = *(mtod(y, char *) + index--);
+ switch (index) {
+ case -1:
+ y = z;
+ index = y->m_len - 1;
+ b = *(mtod(y, char *) + index--);
+ break;
+ case 0:
+ b = *(mtod(y, char *) + index--);
+ y = z;
+ index = y->m_len - 1;
+ break;
+ default:
+ b = *(mtod(y, char *) + index--);
+ break;
+ }
+ a = *(mtod(y, char *) + index--);
+ } else {
+ int begin = 0;
+ int end = so->so_rcv.sb_cc - 3;
+
+ y = so->so_rcv.sb_mb;
+ a = sbindex(&y, &begin, end++);
+ b = sbindex(&y, &begin, end++);
+ c = sbindex(&y, &begin, end++);
+ }
+
+ if (c == '\n' && (b == '\n' || (b == '\r' && a == '\n'))) {
+ /* we have all request headers */
+ goto done;
+ } else {
+ /* still need more data */
+ so->so_upcall = soishttpconnected;
+ so->so_rcv.sb_flags |= SB_UPCALL;
+ return;
+ }
+ }
+
+done:
+ so->so_upcall = NULL;
+ so->so_rcv.sb_flags &= ~SB_UPCALL;
+ soisconnected(so);
+ return;
+}
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