2 * Copyright (c) 2000 Paycounter, Inc.
3 * Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * $FreeBSD: src/sys/netinet/accf_http.c,v 1.1.2.4 2002/05/01 08:34:37 alfred Exp $
28 * $DragonFly: src/sys/net/accf_http/accf_http.c,v 1.4 2007/04/22 01:13:13 dillon Exp $
31 #define ACCEPT_FILTER_MOD
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/sysproto.h>
36 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/unistd.h>
41 #include <sys/fcntl.h>
42 #include <sys/protosw.h>
43 #include <sys/sysctl.h>
44 #include <sys/socket.h>
45 #include <sys/socketvar.h>
48 #include <sys/resource.h>
49 #include <sys/sysent.h>
50 #include <sys/resourcevar.h>
52 /* check for GET/HEAD */
53 static void sohashttpget(struct socket
*so
, void *arg
, int waitflag
);
54 /* check for HTTP/1.0 or HTTP/1.1 */
55 static void soparsehttpvers(struct socket
*so
, void *arg
, int waitflag
);
56 /* check for end of HTTP/1.x request */
57 static void soishttpconnected(struct socket
*so
, void *arg
, int waitflag
);
58 /* strcmp on an mbuf chain */
59 static int mbufstrcmp(struct mbuf
*m
, struct mbuf
*npkt
, int offset
, char *cmp
);
60 /* strncmp on an mbuf chain */
61 static int mbufstrncmp(struct mbuf
*m
, struct mbuf
*npkt
, int offset
,
63 /* socketbuffer is full */
64 static int sbfull(struct signalsockbuf
*sb
);
66 static struct accept_filter accf_http_filter
= {
73 static moduledata_t accf_http_mod
= {
75 accept_filt_generic_mod_event
,
79 DECLARE_MODULE(accf_http
, accf_http_mod
, SI_SUB_DRIVERS
, SI_ORDER_MIDDLE
);
81 static int parse_http_version
= 1;
83 SYSCTL_NODE(_net_inet_accf
, OID_AUTO
, http
, CTLFLAG_RW
, 0,
84 "HTTP accept filter");
85 SYSCTL_INT(_net_inet_accf_http
, OID_AUTO
, parsehttpversion
, CTLFLAG_RW
,
86 &parse_http_version
, 1,
87 "Parse http version so that non 1.x requests work");
89 #ifdef ACCF_HTTP_DEBUG
90 #define DPRINT(fmt, args...) \
92 kprintf("%s:%d: " fmt "\n", __func__, __LINE__ , ##args); \
95 #define DPRINT(fmt, args...)
99 sbfull(struct signalsockbuf
*ssb
)
102 DPRINT("sbfull, cc(%ld) >= hiwat(%ld): %d, mbcnt(%ld) >= mbmax(%ld): %d",
103 ssb
->ssb_cc
, ssb
->ssb_hiwat
, ssb
->ssb_cc
>= ssb
->ssb_hiwat
,
104 ssb
->ssb_mbcnt
, ssb
->ssb_mbmax
, ssb
->ssb_mbcnt
>= ssb
->ssb_mbmax
);
105 return(ssb
->ssb_cc
>= ssb
->ssb_hiwat
||
106 ssb
->ssb_mbcnt
>= ssb
->ssb_mbmax
);
110 * start at mbuf m, (must provide npkt if exists)
111 * starting at offset in m compare characters in mbuf chain for 'cmp'
114 mbufstrcmp(struct mbuf
*m
, struct mbuf
*npkt
, int offset
, char *cmp
)
118 for (;m
!= NULL
; m
= n
) {
121 npkt
= npkt
->m_nextpkt
;
122 for (; m
; m
= m
->m_next
) {
123 for (; offset
< m
->m_len
; offset
++, cmp
++) {
126 } else if (*cmp
!= *(mtod(m
, char *) + offset
)) {
139 * start at mbuf m, (must provide npkt if exists)
140 * starting at offset in m compare characters in mbuf chain for 'cmp'
141 * stop at 'max' characters
144 mbufstrncmp(struct mbuf
*m
, struct mbuf
*npkt
, int offset
, int max
, char *cmp
)
148 for (;m
!= NULL
; m
= n
) {
151 npkt
= npkt
->m_nextpkt
;
152 for (; m
; m
= m
->m_next
) {
153 for (; offset
< m
->m_len
; offset
++, cmp
++, max
--) {
154 if (max
== 0 || *cmp
== '\0') {
156 } else if (*cmp
!= *(mtod(m
, char *) + offset
)) {
160 if (max
== 0 || *cmp
== '\0')
168 #define STRSETUP(sptr, slen, str) \
171 slen = sizeof(str) - 1; \
175 sohashttpget(struct socket
*so
, void *arg
, int waitflag
)
178 if ((so
->so_state
& SS_CANTRCVMORE
) == 0 && !sbfull(&so
->so_rcv
)) {
183 m
= so
->so_rcv
.ssb_mb
;
184 cc
= so
->so_rcv
.ssb_cc
- 1;
187 switch (*mtod(m
, char *)) {
189 STRSETUP(cmp
, cmplen
, "ET ");
192 STRSETUP(cmp
, cmplen
, "EAD ");
198 if (mbufstrncmp(m
, m
->m_nextpkt
, 1, cc
, cmp
) == 1) {
199 DPRINT("short cc (%d) but mbufstrncmp ok", cc
);
202 DPRINT("short cc (%d) mbufstrncmp failed", cc
);
206 if (mbufstrcmp(m
, m
->m_nextpkt
, 1, cmp
) == 1) {
207 DPRINT("mbufstrcmp ok");
208 if (parse_http_version
== 0)
209 soishttpconnected(so
, arg
, waitflag
);
211 soparsehttpvers(so
, arg
, waitflag
);
214 DPRINT("mbufstrcmp bad");
219 so
->so_upcall
= NULL
;
220 atomic_clear_int(&so
->so_rcv
.ssb_flags
, SSB_UPCALL
);
226 soparsehttpvers(struct socket
*so
, void *arg
, int waitflag
)
229 int i
, cc
, spaces
, inspaces
;
231 if ((so
->so_state
& SS_CANTRCVMORE
) != 0 || sbfull(&so
->so_rcv
))
234 m
= so
->so_rcv
.ssb_mb
;
235 cc
= so
->so_rcv
.ssb_cc
;
236 inspaces
= spaces
= 0;
237 for (m
= so
->so_rcv
.ssb_mb
; m
; m
= n
) {
239 for (; m
; m
= m
->m_next
) {
240 for (i
= 0; i
< m
->m_len
; i
++, cc
--) {
241 switch (*(mtod(m
, char *) + i
)) {
254 /* make sure we have enough data left */
255 if (cc
< sizeof("HTTP/1.0") - 1) {
256 if (mbufstrncmp(m
, n
, i
, cc
, "HTTP/1.") == 1) {
257 DPRINT("mbufstrncmp ok");
260 DPRINT("mbufstrncmp bad");
263 } else if (mbufstrcmp(m
, n
, i
, "HTTP/1.0") == 1 ||
264 mbufstrcmp(m
, n
, i
, "HTTP/1.1") == 1) {
265 DPRINT("mbufstrcmp ok");
266 soishttpconnected(so
, arg
, waitflag
);
269 DPRINT("mbufstrcmp bad");
282 * if we hit here we haven't hit something
283 * we don't understand or a newline, so try again
285 so
->so_upcall
= soparsehttpvers
;
286 atomic_set_int(&so
->so_rcv
.ssb_flags
, SSB_UPCALL
);
291 so
->so_upcall
= NULL
;
292 atomic_clear_int(&so
->so_rcv
.ssb_flags
, SSB_UPCALL
);
301 soishttpconnected(struct socket
*so
, void *arg
, int waitflag
)
308 if ((so
->so_state
& SS_CANTRCVMORE
) != 0 || sbfull(&so
->so_rcv
))
312 * Walk the socketbuffer and copy the last NCHRS (3) into a, b, and c
313 * copied - how much we've copied so far
314 * ccleft - how many bytes remaining in the socketbuffer
315 * just loop over the mbufs subtracting from 'ccleft' until we only
319 ccleft
= so
->so_rcv
.ssb_cc
;
323 for (m
= so
->so_rcv
.ssb_mb
; m
; m
= n
) {
325 for (; m
; m
= m
->m_next
) {
327 if (ccleft
<= NCHRS
) {
331 tocopy
= (NCHRS
- ccleft
) - copied
;
332 src
= mtod(m
, char *) + (m
->m_len
- tocopy
);
350 if (c
== '\n' && (b
== '\n' || (b
== '\r' && a
== '\n'))) {
351 /* we have all request headers */
356 so
->so_upcall
= soishttpconnected
;
357 atomic_set_int(&so
->so_rcv
.ssb_flags
, SSB_UPCALL
);
361 so
->so_upcall
= NULL
;
362 atomic_clear_int(&so
->so_rcv
.ssb_flags
, SSB_UPCALL
);