adulau/ssldump
1
0
Fork 0
mirror of https://github.com/adulau/ssldump.git synced 2024-11-25 02:47:06 +00:00
Code Issues Projects Releases Packages Wiki Activity
ssldump/base/network.c
William Robinet 6686cedfdd Add support for IPv6 traffic dump
2021-04-07 17:40:16 +02:00

322 lines
8.3 KiB
C
Raw Permalink Blame History

/**
network.c
Copyright (C) 1999-2000 RTFM, Inc.
All Rights Reserved
This package is a SSLv3/TLS protocol analyzer written by Eric Rescorla
<ekr@rtfm.com> and licensed by RTFM, Inc.
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.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by Eric Rescorla for
RTFM, Inc.
4. Neither the name of RTFM, Inc. nor the name of Eric Rescorla may be
used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY ERIC RESCORLA AND RTFM, INC. ``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 REGENTS 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 SUCH DAMAGE.
$Id: network.c,v 1.10 2002/09/09 21:02:58 ekr Exp $
ekr@rtfm.com Tue Dec 29 09:52:54 1998
*/
#include <sys/types.h>
#include <r_common.h>
#include "network.h"
#ifndef _WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#include "tcppack.h"
#ifdef STDC_HEADERS
#include <string.h>
#endif
UINT4 NET_print_flags;
struct network_handler_ {
proto_mod *mod;
proto_ctx *ctx;
};
int network_handler_create(mod,handlerp)
proto_mod *mod;
n_handler **handlerp;
{
int r,_status;
n_handler *handler=0;
if(!(handler=(n_handler *)malloc(sizeof(n_handler))))
ABORT(R_NO_MEMORY);
if(mod->vtbl->create_ctx){
if((r=mod->vtbl->create_ctx(mod->handle,&handler->ctx)))
ABORT(r);
}
handler->mod=mod;
*handlerp=handler;
_status=0;
abort:
if(_status){
network_handler_destroy(mod, &handler);
}
return(_status);
}
int network_handler_destroy(mod,handlerp)
proto_mod *mod;
n_handler **handlerp;
{
n_handler *handler=0;
if(!handlerp || !*handlerp)
return(0);
handler = *handlerp;
mod->vtbl->destroy_ctx(mod->handle,&handler->ctx);
free(*handlerp);
*handlerp=0;
return(0);
}
int network_process_packet(handler,timestamp,data,length,af)
n_handler *handler;
struct timeval *timestamp;
UCHAR *data;
int length;
int af;
{
int r;
int hlen;
packet p;
u_short off;
int proto;
/*We can pretty much ignore all the options*/
memcpy(&p.ts,timestamp,sizeof(struct timeval));
p.base=data;
p._len=length;
p.data=data;
p.len=length;
p.af=af;
if(p.len < 20) {
if(!(NET_print_flags & NET_PRINT_JSON))
printf("Malformed packet, packet too small to contain IP header, skipping ...\n");
return(0);
}
memset(&p.i_addr.so_st, 0x0, sizeof(struct sockaddr_storage));
memset(&p.r_addr.so_st, 0x0, sizeof(struct sockaddr_storage));
if(af == AF_INET) {
p.l3_hdr.ip=(struct ip *)data;
memcpy(&p.i_addr.so_in.sin_addr, &p.l3_hdr.ip->ip_src, sizeof(struct in_addr));
p.i_addr.so_in.sin_family = AF_INET;
memcpy(&p.r_addr.so_in.sin_addr, &p.l3_hdr.ip->ip_dst, sizeof(struct in_addr));
p.r_addr.so_in.sin_family = AF_INET;
/*Handle, or rather mishandle, fragmentation*/
off=ntohs(p.l3_hdr.ip->ip_off);
if((off & 0x1fff) || /*Later fragment*/
(off & 0x2000)){ /*More fragments*/
/* fprintf(stderr,"Fragmented packet! rejecting\n"); */
return(0);
}
hlen=p.l3_hdr.ip->ip_hl * 4;
p.data += hlen;
p.len = ntohs(p.l3_hdr.ip->ip_len);
if(p.len > length) {
if(!(NET_print_flags & NET_PRINT_JSON))
printf("Malformed packet, size from IP header is larger than size reported by libpcap, skipping ...\n");
return(0);
}
if (p.len == 0) {
DBG((0,"ip length reported as 0, presumed to be because of 'TCP segmentation offload' (TSO)\n"));
p.len = p._len;
}
p.len -= hlen;
proto = p.l3_hdr.ip->ip_p;
} else {
p.l3_hdr.ip6=(struct ip6_hdr *)data;
memcpy(&p.i_addr.so_in6.sin6_addr, &p.l3_hdr.ip6->ip6_src, sizeof(struct in6_addr));
p.i_addr.so_in6.sin6_family = AF_INET6;
memcpy(&p.r_addr.so_in6.sin6_addr, &p.l3_hdr.ip6->ip6_dst, sizeof(struct in6_addr));
p.r_addr.so_in6.sin6_family = AF_INET6;
// Skip packets with header extensions
if(p.l3_hdr.ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) {
return 0;
}
hlen=40; // Fixed header size with no extension
p.data += hlen;
p.len = ntohs(p.l3_hdr.ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
if(p.len > length) {
if(!(NET_print_flags & NET_PRINT_JSON))
printf("Malformed packet, size from IP header is larger than size reported by libpcap, skipping ...\n");
return(0);
}
if (p.len == 0) {
DBG((0,"ip length reported as 0, presumed to be because of 'TCP segmentation offload' (TSO)\n"));
p.len = p._len;
}
proto = p.l3_hdr.ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt;
}
switch(proto){
case IPPROTO_TCP:
if((r=process_tcp_packet(handler->mod,handler->ctx,&p)))
ERETURN(r);
break;
}
return(0);
}
int packet_copy(in,out)
packet *in;
packet **out;
{
int _status;
packet *p=0;
if(!(p=(packet *)calloc(1,sizeof(packet))))
ABORT(R_NO_MEMORY);
memcpy(&p->ts,&in->ts,sizeof(struct timeval));
if(!(p->base=(UCHAR *)malloc(in->_len)))
ABORT(R_NO_MEMORY);
memcpy(p->base,in->base,p->_len=in->_len);
p->data=p->base + (in->data - in->base);
p->len=in->len;
p->ip=(struct ip *)(p->base + ((UCHAR *)in->ip - in->base));
p->tcp=(struct tcphdr *)(p->base + ((UCHAR *)in->tcp - in->base));
*out=p;
_status=0;
abort:
if(_status){
packet_destroy(p);
}
return(_status);
}
int packet_destroy(p)
packet *p;
{
if(!p)
return(0);
FREE(p->base);
FREE(p);
return(0);
}
int timestamp_diff(t1,t0,diff)
struct timeval *t1;
struct timeval *t0;
struct timeval *diff;
{
long d;
if(t0->tv_sec > t1->tv_sec)
ERETURN(R_BAD_ARGS);
/*Easy case*/
if(t0->tv_usec <= t1->tv_usec){
diff->tv_sec=t1->tv_sec - t0->tv_sec;
diff->tv_usec=t1->tv_usec - t0->tv_usec;
return(0);
}
/*Hard case*/
d=t0->tv_usec - t1->tv_usec;
if(t1->tv_sec < (t0->tv_sec + 1))
ERETURN(R_BAD_ARGS);
diff->tv_sec=t1->tv_sec - (t0->tv_sec + 1);
diff->tv_usec=1000000 - d;
return(0);
}
int lookuphostname(so_st,namep)
struct sockaddr_storage *so_st;
char **namep;
{
int r = 1;
*namep = calloc(1, NI_MAXHOST);
void *addr = NULL;
if(!(NET_print_flags & NET_PRINT_NO_RESOLVE)) {
r = getnameinfo((struct sockaddr *) so_st, sizeof(struct sockaddr_storage), *namep, NI_MAXHOST, NULL, 0, 0);
}
if(r) {
if(so_st->ss_family == AF_INET) {
addr = &((struct sockaddr_in *) so_st)->sin_addr;
} else {
addr = &((struct sockaddr_in6 *) so_st)->sin6_addr;
}
inet_ntop(so_st->ss_family, addr, *namep, INET6_ADDRSTRLEN);
}
return(0);
}
int addrtotext(so_st,namep)
struct sockaddr_storage *so_st;
char **namep;
{
*namep = calloc(1, NI_MAXHOST);
void *addr = NULL;
if(so_st->ss_family == AF_INET) {
addr = &((struct sockaddr_in *) so_st)->sin_addr;
} else {
addr = &((struct sockaddr_in6 *) so_st)->sin6_addr;
}
inet_ntop(so_st->ss_family, addr, *namep, INET6_ADDRSTRLEN);
return(0);
}
Reference in a new issue View git blame Copy permalink