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📄 accf_data.c(1.95 KB)
📄 accf_dns.c(3.37 KB)
📄 accf_http.c(8.35 KB)
📁 cc
📄 dccp.h(2.48 KB)
📄 icmp6.h(26.97 KB)
📄 icmp_var.h(3.78 KB)
📄 if_ether.c(41.26 KB)
📄 if_ether.h(4.62 KB)
📄 igmp.c(98.93 KB)
📄 igmp.h(5.36 KB)
📄 igmp_var.h(8.69 KB)
📄 in.c(43.68 KB)
📄 in.h(25.81 KB)
📄 in_cksum.c(4.09 KB)
📄 in_debug.c(3.48 KB)
📄 in_fib.c(8.62 KB)
📄 in_fib.h(2.59 KB)
📄 in_fib_algo.c(18.68 KB)
📄 in_gif.c(11.76 KB)
📄 in_jail.c(10.31 KB)
📄 in_kdtrace.c(5.61 KB)
📄 in_kdtrace.h(3.31 KB)
📄 in_mcast.c(79.22 KB)
📄 in_pcb.c(90.89 KB)
📄 in_pcb.h(34.46 KB)
📄 in_pcbgroup.c(17.28 KB)
📄 in_prot.c(2.35 KB)
📄 in_proto.c(9.36 KB)
📄 in_rmx.c(4.99 KB)
📄 in_rss.c(11.27 KB)
📄 in_rss.h(2.42 KB)
📄 in_systm.h(2.57 KB)
📄 in_var.h(15.4 KB)
📄 ip.h(7.37 KB)
📄 ip6.h(8.93 KB)
📄 ip_carp.c(53.25 KB)
📄 ip_carp.h(6.79 KB)
📄 ip_divert.c(21.74 KB)
📄 ip_divert.h(2.32 KB)
📄 ip_dummynet.h(8.94 KB)
📄 ip_ecn.c(5.83 KB)
📄 ip_ecn.h(2.1 KB)
📄 ip_encap.c(10.59 KB)
📄 ip_encap.h(3.13 KB)
📄 ip_fastfwd.c(13.79 KB)
📄 ip_fw.h(34.29 KB)
📄 ip_gre.c(15.28 KB)
📄 ip_icmp.c(31.15 KB)
📄 ip_icmp.h(8.52 KB)
📄 ip_id.c(9.78 KB)
📄 ip_input.c(37.16 KB)
📄 ip_mroute.c(75.86 KB)
📄 ip_mroute.h(13.66 KB)
📄 ip_options.c(19.9 KB)
📄 ip_options.h(2.61 KB)
📄 ip_output.c(40.67 KB)
📄 ip_reass.c(22.42 KB)
📄 ip_var.h(11.48 KB)
📁 khelp
📁 libalias
📁 netdump
📄 pim.h(4.25 KB)
📄 pim_var.h(3.14 KB)
📄 raw_ip.c(28.58 KB)
📄 sctp.h(22.97 KB)
📄 sctp_asconf.c(100.05 KB)
📄 sctp_asconf.h(3.31 KB)
📄 sctp_auth.c(50.44 KB)
📄 sctp_auth.h(8.52 KB)
📄 sctp_bsd_addr.c(13.89 KB)
📄 sctp_bsd_addr.h(2.45 KB)
📄 sctp_cc_functions.c(68.75 KB)
📄 sctp_constants.h(34.12 KB)
📄 sctp_crc32.c(4.5 KB)
📄 sctp_crc32.h(2.07 KB)
📄 sctp_header.h(17.48 KB)
📄 sctp_indata.c(175.36 KB)
📄 sctp_indata.h(4.18 KB)
📄 sctp_input.c(183.57 KB)
📄 sctp_input.h(2.43 KB)
📄 sctp_kdtrace.c(7.51 KB)
📄 sctp_kdtrace.h(3.6 KB)
📄 sctp_lock_bsd.h(15.64 KB)
📄 sctp_module.c(5.16 KB)
📄 sctp_os.h(2.73 KB)
📄 sctp_os_bsd.h(15.04 KB)
📄 sctp_output.c(362.89 KB)
📄 sctp_output.h(6.38 KB)
📄 sctp_pcb.c(198.87 KB)
📄 sctp_pcb.h(19.31 KB)
📄 sctp_peeloff.c(5.74 KB)
📄 sctp_peeloff.h(2.05 KB)
📄 sctp_ss_functions.c(30.72 KB)
📄 sctp_structs.h(38.29 KB)
📄 sctp_syscalls.c(13.94 KB)
📄 sctp_sysctl.c(37.45 KB)
📄 sctp_sysctl.h(22.9 KB)
📄 sctp_timer.c(47.92 KB)
📄 sctp_timer.h(3.07 KB)
📄 sctp_uio.h(38.07 KB)
📄 sctp_usrreq.c(216.08 KB)
📄 sctp_var.h(12.21 KB)
📄 sctputil.c(212.13 KB)
📄 sctputil.h(11.69 KB)
📄 siftr.c(45.2 KB)
📄 tcp.h(18.3 KB)
📄 tcp_debug.c(5.9 KB)
📄 tcp_debug.h(2.65 KB)
📄 tcp_fastopen.c(37.98 KB)
📄 tcp_fastopen.h(3.7 KB)
📄 tcp_fsm.h(4.25 KB)
📄 tcp_hostcache.c(21.43 KB)
📄 tcp_hostcache.h(2.92 KB)
📄 tcp_hpts.c(57.55 KB)
📄 tcp_hpts.h(9.89 KB)
📄 tcp_input.c(115.95 KB)
📄 tcp_log_buf.c(76.37 KB)
📄 tcp_log_buf.h(14.88 KB)
📄 tcp_lro.c(36.38 KB)
📄 tcp_lro.h(4.43 KB)
📄 tcp_offload.c(5.48 KB)
📄 tcp_offload.h(2.09 KB)
📄 tcp_output.c(60.16 KB)
📄 tcp_pcap.c(12.67 KB)
📄 tcp_pcap.h(1.76 KB)
📄 tcp_ratelimit.c(43.8 KB)
📄 tcp_ratelimit.h(5.07 KB)
📄 tcp_reass.c(30.75 KB)
📄 tcp_sack.c(26.74 KB)
📄 tcp_seq.h(3.57 KB)
📁 tcp_stacks
📄 tcp_stats.c(8.47 KB)
📄 tcp_subr.c(92.74 KB)
📄 tcp_syncache.c(73 KB)
📄 tcp_syncache.h(5.16 KB)
📄 tcp_timer.c(31.04 KB)
📄 tcp_timer.h(9.29 KB)
📄 tcp_timewait.c(19.06 KB)
📄 tcp_usrreq.c(71.35 KB)
📄 tcp_var.h(43.48 KB)
📄 tcpip.h(2.29 KB)
📄 toecore.c(13.51 KB)
📄 toecore.h(5.13 KB)
📄 udp.h(2.49 KB)
📄 udp_usrreq.c(44.57 KB)
📄 udp_var.h(6.48 KB)
📄 udplite.h(1.91 KB)

Editing: accf_http.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#define ACCEPT_FILTER_MOD

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/socketvar.h>

/* check for GET/HEAD */
static int sohashttpget(struct socket *so, void *arg, int waitflag);
/* check for HTTP/1.0 or HTTP/1.1 */
static int soparsehttpvers(struct socket *so, void *arg, int waitflag);
/* check for end of HTTP/1.x request */
static int 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);

ACCEPT_FILTER_DEFINE(accf_http, "httpready", sohashttpget, NULL, NULL, 1);

static int parse_http_version = 1;

static SYSCTL_NODE(_net_inet_accf, OID_AUTO, http,
    CTLFLAG_RW | CTLFLAG_MPSAFE, 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 (sbused(sb) >= 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);
			}
			if (*cmp == '\0')
				return (1);
			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);
			}
			if (max == 0 || *cmp == '\0')
				return (1);
			offset = 0;
		}
	}
	return (0);
}

#define STRSETUP(sptr, slen, str)					\
	do {								\
		sptr = str;						\
		slen = sizeof(str) - 1;					\
	} while(0)

static int
sohashttpget(struct socket *so, void *arg, int waitflag)
{

if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 &&
	    !sbfull(&so->so_rcv)) {
		struct mbuf *m;
		char *cmp;
		int	cmplen, cc;

m = so->so_rcv.sb_mb;
		cc = sbavail(&so->so_rcv) - 1;
		if (cc < 1)
			return (SU_OK);
		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 (SU_OK);
			} 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)
				return (soishttpconnected(so, arg, waitflag));
			else
				return (soparsehttpvers(so, arg, waitflag));
		}
		DPRINT("mbufstrcmp bad");
	}

fallout:
	DPRINT("fallout");
	return (SU_ISCONNECTED);
}

static int
soparsehttpvers(struct socket *so, void *arg, int waitflag)
{
	struct mbuf *m, *n;
	int	i, cc, spaces, inspaces;

if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) != 0 || sbfull(&so->so_rcv))
		goto fallout;

m = so->so_rcv.sb_mb;
	cc = sbavail(&so->so_rcv);
	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 ' ':
					/* tabs? '\t' */
					if (!inspaces) {
						spaces++;
						inspaces = 1;
					}
					break;
				case '\r':
				case '\n':
					DPRINT("newline");
					goto fallout;
				default:
					if (spaces != 2) {
						inspaces = 0;
						break;
					}

/*
					 * if we don't have enough characters
					 * left (cc < sizeof("HTTP/1.0") - 1)
					 * then see if the remaining ones
					 * are a request we can parse.
					 */
					if (cc < sizeof("HTTP/1.0") - 1) {
						if (mbufstrncmp(m, n, i, cc,
							"HTTP/1.") == 1) {
							DPRINT("ok");
							goto readmore;
						} else {
							DPRINT("bad");
							goto fallout;
						}
					} else if (
					    mbufstrcmp(m, n, i, "HTTP/1.0") ||
					    mbufstrcmp(m, n, i, "HTTP/1.1")) {
						DPRINT("ok");
						return (soishttpconnected(so,
						    arg, waitflag));
					} else {
						DPRINT("bad");
						goto fallout;
					}
				}
			}
		}
	}
readmore:
	DPRINT("readmore");
	/*
	 * if we hit here we haven't hit something
	 * we don't understand or a newline, so try again
	 */
	soupcall_set(so, SO_RCV, soparsehttpvers, arg);
	return (SU_OK);

fallout:
	DPRINT("fallout");
	return (SU_ISCONNECTED);
}

#define NCHRS 3

static int
soishttpconnected(struct socket *so, void *arg, int waitflag)
{
	char a, b, c;
	struct mbuf *m, *n;
	int ccleft, copied;

DPRINT("start");
	if ((so->so_rcv.sb_state & SBS_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 = sbavail(&so->so_rcv);
	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:
	soupcall_set(so, SO_RCV, soishttpconnected, arg);
	return (SU_OK);

gotit:
	return (SU_ISCONNECTED);
}

003 File Manager

Editing: accf_http.c

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