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-rw-r--r--sys/netinet/accf_http.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/sys/netinet/accf_http.c b/sys/netinet/accf_http.c
new file mode 100644
index 0000000..a9a8fb0
--- /dev/null
+++ b/sys/netinet/accf_http.c
@@ -0,0 +1,346 @@
+/*
+ * Copyright (c) 2000 Paycounter, Inc.
+ * Author: Alfred Perlstein <alfred@paycounter.com>, <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/kernel.h>
+#include <sys/sysctl.h>
+#include <sys/socketvar.h>
+#include <sys/mbuf.h>
+
+/* check for GET/HEAD */
+static void sohashttpget(struct socket *so, void *arg, int waitflag);
+/* check for HTTP/1.0 or HTTP/1.1 */
+static void soparsehttpvers(struct socket *so, void *arg, int waitflag);
+/* check for end of HTTP/1.x request */
+static void soishttpconnected(struct socket *so, void *arg, int waitflag);
+/* strcmp on an mbuf chain */
+static int mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, char *cmp);
+/* strncmp on an mbuf chain */
+static int mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset,
+ int max, char *cmp);
+/* socketbuffer is full */
+static int sbfull(struct sockbuf *sb);
+
+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 int parse_http_version = 1;
+
+SYSCTL_NODE(_net_inet_accf, OID_AUTO, http, CTLFLAG_RW, 0,
+"HTTP accept filter");
+SYSCTL_INT(_net_inet_accf_http, OID_AUTO, parsehttpversion, CTLFLAG_RW,
+&parse_http_version, 1,
+"Parse http version so that non 1.x requests work");
+
+#ifdef ACCF_HTTP_DEBUG
+#define DPRINT(fmt, args...) \
+ do { \
+ printf("%s:%d: " fmt "\n", __func__, __LINE__ , ##args); \
+ } while (0)
+#else
+#define DPRINT(fmt, args...)
+#endif
+
+static int
+sbfull(struct sockbuf *sb)
+{
+
+ DPRINT("sbfull, cc(%ld) >= hiwat(%ld): %d, mbcnt(%ld) >= mbmax(%ld): %d",
+ sb->sb_cc, sb->sb_hiwat, sb->sb_cc >= sb->sb_hiwat,
+ sb->sb_mbcnt, sb->sb_mbmax, sb->sb_mbcnt >= sb->sb_mbmax);
+ return(sb->sb_cc >= sb->sb_hiwat || sb->sb_mbcnt >= sb->sb_mbmax);
+}
+
+/*
+ * start at mbuf m, (must provide npkt if exists)
+ * starting at offset in m compare characters in mbuf chain for 'cmp'
+ */
+static int
+mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, char *cmp)
+{
+ struct mbuf *n;
+
+ for (;m != NULL; m = n) {
+ n = npkt;
+ if (npkt)
+ npkt = npkt->m_nextpkt;
+ for (; m; m = m->m_next) {
+ for (; offset < m->m_len; offset++, cmp++) {
+ if (*cmp == '\0') {
+ return (1);
+ } else if (*cmp != *(mtod(m, char *) + offset)) {
+ return (0);
+ }
+ }
+ offset = 0;
+ }
+ }
+ return (0);
+}
+
+/*
+ * start at mbuf m, (must provide npkt if exists)
+ * starting at offset in m compare characters in mbuf chain for 'cmp'
+ * stop at 'max' characters
+ */
+static int
+mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, int max, char *cmp)
+{
+ struct mbuf *n;
+
+ for (;m != NULL; m = n) {
+ n = npkt;
+ if (npkt)
+ npkt = npkt->m_nextpkt;
+ for (; m; m = m->m_next) {
+ for (; offset < m->m_len; offset++, cmp++, max--) {
+ if (max == 0 || *cmp == '\0') {
+ return (1);
+ } else if (*cmp != *(mtod(m, char *) + offset)) {
+ return (0);
+ }
+ }
+ offset = 0;
+ }
+ }
+ return (0);
+}
+
+#define STRSETUP(sptr, slen, str) \
+ do { \
+ sptr = str; \
+ slen = sizeof(str) - 1; \
+ } while(0)
+
+static void
+sohashttpget(struct socket *so, void *arg, int waitflag)
+{
+
+ if ((so->so_state & SS_CANTRCVMORE) == 0 && !sbfull(&so->so_rcv)) {
+ struct mbuf *m;
+ char *cmp;
+ int cmplen, cc;
+
+ m = so->so_rcv.sb_mb;
+ cc = so->so_rcv.sb_cc - 1;
+ if (cc < 1)
+ return;
+ switch (*mtod(m, char *)) {
+ case 'G':
+ STRSETUP(cmp, cmplen, "ET ");
+ break;
+ case 'H':
+ STRSETUP(cmp, cmplen, "EAD ");
+ break;
+ default:
+ goto fallout;
+ }
+ if (cc < cmplen) {
+ if (mbufstrncmp(m, m->m_nextpkt, 1, cc, cmp) == 1) {
+ DPRINT("short cc (%d) but mbufstrncmp ok", cc);
+ return;
+ } else {
+ DPRINT("short cc (%d) mbufstrncmp failed", cc);
+ goto fallout;
+ }
+ }
+ if (mbufstrcmp(m, m->m_nextpkt, 1, cmp) == 1) {
+ DPRINT("mbufstrcmp ok");
+ if (parse_http_version == 0)
+ soishttpconnected(so, arg, waitflag);
+ else
+ soparsehttpvers(so, arg, waitflag);
+ return;
+ }
+ DPRINT("mbufstrcmp bad");
+ }
+
+fallout:
+ DPRINT("fallout");
+ so->so_upcall = NULL;
+ so->so_rcv.sb_flags &= ~SB_UPCALL;
+ soisconnected(so);
+ return;
+}
+
+static void
+soparsehttpvers(struct socket *so, void *arg, int waitflag)
+{
+ struct mbuf *m, *n;
+ int i, cc, spaces, inspaces;
+
+ if ((so->so_state & SS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
+ goto fallout;
+
+ m = so->so_rcv.sb_mb;
+ cc = so->so_rcv.sb_cc;
+ inspaces = spaces = 0;
+ for (m = so->so_rcv.sb_mb; m; m = n) {
+ n = m->m_nextpkt;
+ for (; m; m = m->m_next) {
+ for (i = 0; i < m->m_len; i++, cc--) {
+ switch (*(mtod(m, char *) + i)) {
+ case ' ':
+ if (!inspaces) {
+ spaces++;
+ inspaces = 1;
+ }
+ break;
+ case '\r':
+ case '\n':
+ DPRINT("newline");
+ goto fallout;
+ default:
+ if (spaces == 2) {
+ /* make sure we have enough data left */
+ if (cc < sizeof("HTTP/1.0") - 1) {
+ if (mbufstrncmp(m, n, i, cc, "HTTP/1.") == 1) {
+ DPRINT("mbufstrncmp ok");
+ goto readmore;
+ } else {
+ DPRINT("mbufstrncmp bad");
+ goto fallout;
+ }
+ } else if (mbufstrcmp(m, n, i, "HTTP/1.0") == 1 ||
+ mbufstrcmp(m, n, i, "HTTP/1.1") == 1) {
+ DPRINT("mbufstrcmp ok");
+ soishttpconnected(so, arg, waitflag);
+ return;
+ } else {
+ DPRINT("mbufstrcmp bad");
+ goto fallout;
+ }
+ }
+ inspaces = 0;
+ break;
+ }
+ }
+ }
+ }
+readmore:
+ DPRINT("readmore");
+ /*
+ * if we hit here we haven't hit something
+ * we don't understand or a newline, so try again
+ */
+ so->so_upcall = soparsehttpvers;
+ so->so_rcv.sb_flags |= SB_UPCALL;
+ return;
+
+fallout:
+ DPRINT("fallout");
+ so->so_upcall = NULL;
+ so->so_rcv.sb_flags &= ~SB_UPCALL;
+ soisconnected(so);
+ return;
+}
+
+
+#define NCHRS 3
+
+static void
+soishttpconnected(struct socket *so, void *arg, int waitflag)
+{
+ char a, b, c;
+ struct mbuf *m, *n;
+ int ccleft, copied;
+
+ DPRINT("start");
+ if ((so->so_state & SS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
+ goto gotit;
+
+ /*
+ * Walk the socketbuffer and copy the last NCHRS (3) into a, b, and c
+ * copied - how much we've copied so far
+ * ccleft - how many bytes remaining in the socketbuffer
+ * just loop over the mbufs subtracting from 'ccleft' until we only
+ * have NCHRS left
+ */
+ copied = 0;
+ ccleft = so->so_rcv.sb_cc;
+ if (ccleft < NCHRS)
+ goto readmore;
+ a = b = c = '\0';
+ for (m = so->so_rcv.sb_mb; m; m = n) {
+ n = m->m_nextpkt;
+ for (; m; m = m->m_next) {
+ ccleft -= m->m_len;
+ if (ccleft <= NCHRS) {
+ char *src;
+ int tocopy;
+
+ tocopy = (NCHRS - ccleft) - copied;
+ src = mtod(m, char *) + (m->m_len - tocopy);
+
+ while (tocopy--) {
+ switch (copied++) {
+ case 0:
+ a = *src++;
+ break;
+ case 1:
+ b = *src++;
+ break;
+ case 2:
+ c = *src++;
+ break;
+ }
+ }
+ }
+ }
+ }
+ if (c == '\n' && (b == '\n' || (b == '\r' && a == '\n'))) {
+ /* we have all request headers */
+ goto gotit;
+ }
+
+readmore:
+ so->so_upcall = soishttpconnected;
+ so->so_rcv.sb_flags |= SB_UPCALL;
+ return;
+
+gotit:
+ so->so_upcall = NULL;
+ so->so_rcv.sb_flags &= ~SB_UPCALL;
+ soisconnected(so);
+ return;
+}
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