diff options
Diffstat (limited to 'sys/netinet/accf_http.c')
-rw-r--r-- | sys/netinet/accf_http.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/sys/netinet/accf_http.c b/sys/netinet/accf_http.c new file mode 100644 index 0000000..09a4e9f --- /dev/null +++ b/sys/netinet/accf_http.c @@ -0,0 +1,183 @@ +/*- + * 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; +} |