78a6b08618
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
353 lines
8.5 KiB
C
353 lines
8.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2000 Paycounter, Inc.
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* Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define ACCEPT_FILTER_MOD
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/socketvar.h>
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/* check for GET/HEAD */
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static int sohashttpget(struct socket *so, void *arg, int waitflag);
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/* check for HTTP/1.0 or HTTP/1.1 */
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static int soparsehttpvers(struct socket *so, void *arg, int waitflag);
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/* check for end of HTTP/1.x request */
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static int soishttpconnected(struct socket *so, void *arg, int waitflag);
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/* strcmp on an mbuf chain */
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static int mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, char *cmp);
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/* strncmp on an mbuf chain */
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static int mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset,
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int max, char *cmp);
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/* socketbuffer is full */
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static int sbfull(struct sockbuf *sb);
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static struct accept_filter accf_http_filter = {
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"httpready",
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sohashttpget,
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NULL,
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NULL
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};
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static moduledata_t accf_http_mod = {
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"accf_http",
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accept_filt_generic_mod_event,
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&accf_http_filter
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};
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DECLARE_MODULE(accf_http, accf_http_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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static int parse_http_version = 1;
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static SYSCTL_NODE(_net_inet_accf, OID_AUTO, http, CTLFLAG_RW, 0,
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"HTTP accept filter");
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SYSCTL_INT(_net_inet_accf_http, OID_AUTO, parsehttpversion, CTLFLAG_RW,
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&parse_http_version, 1,
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"Parse http version so that non 1.x requests work");
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#ifdef ACCF_HTTP_DEBUG
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#define DPRINT(fmt, args...) \
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do { \
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printf("%s:%d: " fmt "\n", __func__, __LINE__, ##args); \
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} while (0)
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#else
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#define DPRINT(fmt, args...)
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#endif
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static int
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sbfull(struct sockbuf *sb)
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{
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DPRINT("sbfull, cc(%ld) >= hiwat(%ld): %d, "
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"mbcnt(%ld) >= mbmax(%ld): %d",
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sb->sb_cc, sb->sb_hiwat, sb->sb_cc >= sb->sb_hiwat,
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sb->sb_mbcnt, sb->sb_mbmax, sb->sb_mbcnt >= sb->sb_mbmax);
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return (sbused(sb) >= sb->sb_hiwat || sb->sb_mbcnt >= sb->sb_mbmax);
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}
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/*
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* start at mbuf m, (must provide npkt if exists)
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* starting at offset in m compare characters in mbuf chain for 'cmp'
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*/
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static int
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mbufstrcmp(struct mbuf *m, struct mbuf *npkt, int offset, char *cmp)
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{
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struct mbuf *n;
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for (; m != NULL; m = n) {
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n = npkt;
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if (npkt)
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npkt = npkt->m_nextpkt;
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for (; m; m = m->m_next) {
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for (; offset < m->m_len; offset++, cmp++) {
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if (*cmp == '\0')
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return (1);
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else if (*cmp != *(mtod(m, char *) + offset))
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return (0);
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}
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if (*cmp == '\0')
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return (1);
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offset = 0;
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}
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}
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return (0);
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}
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/*
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* start at mbuf m, (must provide npkt if exists)
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* starting at offset in m compare characters in mbuf chain for 'cmp'
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* stop at 'max' characters
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*/
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static int
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mbufstrncmp(struct mbuf *m, struct mbuf *npkt, int offset, int max, char *cmp)
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{
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struct mbuf *n;
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for (; m != NULL; m = n) {
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n = npkt;
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if (npkt)
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npkt = npkt->m_nextpkt;
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for (; m; m = m->m_next) {
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for (; offset < m->m_len; offset++, cmp++, max--) {
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if (max == 0 || *cmp == '\0')
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return (1);
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else if (*cmp != *(mtod(m, char *) + offset))
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return (0);
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}
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if (max == 0 || *cmp == '\0')
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return (1);
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offset = 0;
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}
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}
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return (0);
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}
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#define STRSETUP(sptr, slen, str) \
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do { \
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sptr = str; \
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slen = sizeof(str) - 1; \
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} while(0)
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static int
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sohashttpget(struct socket *so, void *arg, int waitflag)
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{
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 &&
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!sbfull(&so->so_rcv)) {
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struct mbuf *m;
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char *cmp;
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int cmplen, cc;
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m = so->so_rcv.sb_mb;
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cc = sbavail(&so->so_rcv) - 1;
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if (cc < 1)
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return (SU_OK);
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switch (*mtod(m, char *)) {
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case 'G':
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STRSETUP(cmp, cmplen, "ET ");
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break;
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case 'H':
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STRSETUP(cmp, cmplen, "EAD ");
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break;
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default:
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goto fallout;
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}
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if (cc < cmplen) {
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if (mbufstrncmp(m, m->m_nextpkt, 1, cc, cmp) == 1) {
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DPRINT("short cc (%d) but mbufstrncmp ok", cc);
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return (SU_OK);
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} else {
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DPRINT("short cc (%d) mbufstrncmp failed", cc);
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goto fallout;
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}
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}
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if (mbufstrcmp(m, m->m_nextpkt, 1, cmp) == 1) {
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DPRINT("mbufstrcmp ok");
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if (parse_http_version == 0)
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return (soishttpconnected(so, arg, waitflag));
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else
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return (soparsehttpvers(so, arg, waitflag));
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}
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DPRINT("mbufstrcmp bad");
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}
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fallout:
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DPRINT("fallout");
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return (SU_ISCONNECTED);
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}
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static int
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soparsehttpvers(struct socket *so, void *arg, int waitflag)
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{
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struct mbuf *m, *n;
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int i, cc, spaces, inspaces;
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
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goto fallout;
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m = so->so_rcv.sb_mb;
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cc = sbavail(&so->so_rcv);
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inspaces = spaces = 0;
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for (m = so->so_rcv.sb_mb; m; m = n) {
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n = m->m_nextpkt;
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for (; m; m = m->m_next) {
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for (i = 0; i < m->m_len; i++, cc--) {
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switch (*(mtod(m, char *) + i)) {
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case ' ':
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/* tabs? '\t' */
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if (!inspaces) {
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spaces++;
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inspaces = 1;
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}
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break;
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case '\r':
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case '\n':
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DPRINT("newline");
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goto fallout;
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default:
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if (spaces != 2) {
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inspaces = 0;
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break;
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}
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/*
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* if we don't have enough characters
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* left (cc < sizeof("HTTP/1.0") - 1)
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* then see if the remaining ones
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* are a request we can parse.
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*/
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if (cc < sizeof("HTTP/1.0") - 1) {
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if (mbufstrncmp(m, n, i, cc,
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"HTTP/1.") == 1) {
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DPRINT("ok");
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goto readmore;
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} else {
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DPRINT("bad");
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goto fallout;
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}
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} else if (
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mbufstrcmp(m, n, i, "HTTP/1.0") ||
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mbufstrcmp(m, n, i, "HTTP/1.1")) {
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DPRINT("ok");
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return (soishttpconnected(so,
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arg, waitflag));
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} else {
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DPRINT("bad");
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goto fallout;
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}
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}
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}
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}
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}
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readmore:
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DPRINT("readmore");
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/*
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* if we hit here we haven't hit something
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* we don't understand or a newline, so try again
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*/
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soupcall_set(so, SO_RCV, soparsehttpvers, arg);
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return (SU_OK);
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fallout:
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DPRINT("fallout");
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return (SU_ISCONNECTED);
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}
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#define NCHRS 3
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static int
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soishttpconnected(struct socket *so, void *arg, int waitflag)
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{
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char a, b, c;
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struct mbuf *m, *n;
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int ccleft, copied;
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DPRINT("start");
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
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goto gotit;
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/*
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* Walk the socketbuffer and copy the last NCHRS (3) into a, b, and c
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* copied - how much we've copied so far
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* ccleft - how many bytes remaining in the socketbuffer
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* just loop over the mbufs subtracting from 'ccleft' until we only
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* have NCHRS left
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*/
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copied = 0;
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ccleft = sbavail(&so->so_rcv);
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if (ccleft < NCHRS)
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goto readmore;
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a = b = c = '\0';
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for (m = so->so_rcv.sb_mb; m; m = n) {
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n = m->m_nextpkt;
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for (; m; m = m->m_next) {
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ccleft -= m->m_len;
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if (ccleft <= NCHRS) {
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char *src;
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int tocopy;
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tocopy = (NCHRS - ccleft) - copied;
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src = mtod(m, char *) + (m->m_len - tocopy);
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while (tocopy--) {
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switch (copied++) {
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case 0:
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a = *src++;
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break;
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case 1:
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b = *src++;
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break;
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case 2:
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c = *src++;
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break;
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}
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}
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}
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}
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}
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if (c == '\n' && (b == '\n' || (b == '\r' && a == '\n'))) {
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/* we have all request headers */
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goto gotit;
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}
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readmore:
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soupcall_set(so, SO_RCV, soishttpconnected, arg);
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return (SU_OK);
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gotit:
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return (SU_ISCONNECTED);
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}
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