forked from antirez/hping
/
script.c
1360 lines (1255 loc) · 36.4 KB
/
script.c
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/* Hping's TCL scripting support
* Copyright (C) 2003 Salvatore Sanfilippo
* All Rights Reserved */
/* URGENT TODO:
*
* link header size in recv_handlers, -1 means autodetection. */
/* $Id: script.c,v 1.20 2004/05/29 06:48:13 antirez Exp $ */
#ifdef USE_TCL
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tcl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <sched.h>
#include <sys/ioctl.h>
#include <net/bpf.h>
#include <pcap.h> //pcap.h *must* be included AFTER net/bpf.h for osx
#include "release.h"
#include "hping2.h"
#include "ars.h"
#include "interface.h"
#include "apdutils.h"
#include "sbignum.h"
#define HPING_IF_MAX 8
/* ----------------------- hping recv handlers code ------------------------- */
struct recv_handler {
Tcl_Interp *rh_interp; /* If not null has [hpingevent] handler. */
Tcl_Obj *rh_handlerscript; /* the [hpingevent] handler script. */
char rh_ifname[HPING_IFNAME_LEN];
int rh_linkhdrsize; /* -1 means autodetection */
pcap_t *rh_pcapfp;
char rh_pcap_errbuf[PCAP_ERRBUF_SIZE];
};
struct recv_handler recv_handlers[HPING_IFACE_MAX];
/* Recv handlers intialization */
static void HpingRecvInit(struct recv_handler *ra, int len)
{
memset(ra, 0, sizeof(*ra)*len);
}
static void HpingRecvCloseHandler(struct recv_handler *ra)
{
ra->rh_ifname[0] = '\0';
if (ra->rh_interp != NULL) {
Tcl_DeleteFileHandler(pcap_fileno(ra->rh_pcapfp));
Tcl_DecrRefCount(ra->rh_handlerscript);
}
pcap_close(ra->rh_pcapfp);
ra->rh_interp = NULL;
}
static struct recv_handler *HpingRecvGetHandler(struct recv_handler *ra, int len, char *ifname, Tcl_Interp *interp)
{
int i;
#if (!defined OSTYPE_LINUX) && (!defined __sun__)
int on = 1;
#endif
for (i = 0; i < len; i++) {
if (!ra[i].rh_ifname[0])
break;
if (!strcmp(ra[i].rh_ifname, ifname))
return ra+i;
}
/* Not found, need to open it */
if (i == len) {
/* XXX: with hping setfilter this is broken */
/* All the slots are full, make space at the end */
HpingRecvCloseHandler(ra+(len-1));
i--;
}
/* Open a new handler */
ra[i].rh_pcapfp = pcap_open_live(ifname, 99999, 0, 1, ra[i].rh_pcap_errbuf);
if (ra[i].rh_pcapfp == NULL)
return NULL;
#if (!defined OSTYPE_LINUX) && (!defined __sun__)
/* Return the packets to userspace as fast as possible */
if (ioctl(pcap_fileno(ra[i].rh_pcapfp), BIOCIMMEDIATE, &on) == -1) {
/* XXX non-critical error */
}
#endif
strlcpy(ra[i].rh_ifname, ifname, HPING_IFNAME_LEN);
ra[i].rh_interp = NULL;
ra[i].rh_linkhdrsize = dltype_to_lhs(pcap_datalink(ra[i].rh_pcapfp));
return ra+i;
}
/* ----------------------------- Sub commands ------------------------------- */
/* hping resolve hostname */
static int HpingResolveCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct sockaddr_in saddr;
char *hostname;
Tcl_Obj *result;
result = Tcl_GetObjResult(interp);
if (objc != 3 && objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "?-ptr? hostname");
return TCL_ERROR;
}
if (objc == 4) {
char *ptropt, *ipaddr;
struct in_addr ina;
struct hostent *he;
ptropt = Tcl_GetStringFromObj(objv[2], NULL);
if (strcmp(ptropt, "-ptr")) {
Tcl_SetStringObj(result, "The only valid option for resolve is -ptr", -1);
return TCL_ERROR;
}
ipaddr = Tcl_GetStringFromObj(objv[3], NULL);
if (inet_aton(ipaddr, &ina) == 0) {
Tcl_SetStringObj(result, "Invalid IP address: ", -1);
Tcl_AppendStringsToObj(result, ipaddr, NULL);
return TCL_ERROR;
}
he = gethostbyaddr((const char*)&ina.s_addr, sizeof(ina.s_addr), AF_INET);
if (he == NULL)
Tcl_SetStringObj(result, ipaddr, -1);
else
Tcl_SetStringObj(result, he->h_name, -1);
return TCL_OK;
}
hostname = Tcl_GetStringFromObj(objv[2], NULL);
if (resolve_addr((struct sockaddr*)&saddr, hostname) != -1) {
Tcl_SetStringObj(result, inet_ntoa(saddr.sin_addr), -1);
return TCL_OK;
} else {
Tcl_SetStringObj(result, "Unable to resolve: ", -1);
Tcl_AppendStringsToObj(result, hostname, NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/* raw socket is shared between different functions, but note
* that it gets open only once needed. This makes possible
* to run hping scripts doing unprivileged work without root
* access. */
static int rawsocket = -1;
/* hping send ?-nocompile? pktdescr */
static int HpingSendCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct ars_packet p;
int nocompile = 0;
Tcl_Obj *result;
char *packetdescr, *noc;
if (objc != 3 && objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "?-nocompile? packet");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
if (objc == 4) {
noc = Tcl_GetStringFromObj(objv[2], NULL);
if (strcmp(noc, "-nocompile")) {
Tcl_SetStringObj(result, "Invalid option", -1);
return TCL_ERROR;
}
nocompile = 1;
objv++;
}
ars_init(&p);
packetdescr = Tcl_GetStringFromObj(objv[2], NULL);
if (rawsocket == -1) {
rawsocket = ars_open_rawsocket(&p);
if (rawsocket == -ARS_ERROR) {
Tcl_SetStringObj(result, "Error opening raw socket: ", -1);
Tcl_AppendStringsToObj(result, strerror(errno), NULL);
ars_destroy(&p);
return TCL_ERROR;
}
}
if (ars_d_build(&p, packetdescr) != -ARS_OK) {
Tcl_SetStringObj(result, "Packet building error: '", -1);
Tcl_AppendStringsToObj(result, p.p_error,"' in packet ", packetdescr, NULL);
ars_destroy(&p);
return TCL_ERROR;
}
if (!nocompile) {
if (ars_compile(&p) != -ARS_OK) {
Tcl_SetStringObj(result, "Packet compilation error: ", -1);
Tcl_AppendStringsToObj(result, p.p_error, NULL);
ars_destroy(&p);
return TCL_ERROR;
}
}
if (ars_send(rawsocket, &p, NULL, 0) != -ARS_OK) {
Tcl_SetStringObj(result, "Sending packet: ", -1);
Tcl_AppendStringsToObj(result, strerror(errno), NULL);
ars_destroy(&p);
return TCL_ERROR;
}
ars_destroy(&p);
return TCL_OK;
}
/* hping sendraw pktdata */
static int HpingSendRawCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
int error;
Tcl_Obj *result;
struct sockaddr_in sa;
char *pkt;
int pktlen;
struct ars_iphdr *ip;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "data");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
/* Get packet data */
pkt = Tcl_GetStringFromObj(objv[2], &pktlen);
/* Check if the packet is too short */
if (pktlen < sizeof(struct ars_iphdr)) {
Tcl_SetStringObj(result, "Packet shorter than IPv4 header", -1);
return TCL_ERROR;
}
ip = (struct ars_iphdr*) pkt;
/* Get the destination IP from the packet itself */
sa.sin_family = AF_INET;
memcpy(&sa.sin_addr.s_addr, &ip->daddr, 4);
/* Open the rawsocket if needed */
if (rawsocket == -1) {
rawsocket = ars_open_rawsocket(NULL);
if (rawsocket == -ARS_ERROR) {
Tcl_SetStringObj(result, "Error opening raw socket: ", -1);
Tcl_AppendStringsToObj(result, strerror(errno), NULL);
return TCL_ERROR;
}
}
/* ready to send */
error = sendto(rawsocket, pkt, pktlen, 0, (struct sockaddr*)&sa, sizeof(sa));
if (error == -1) {
Tcl_SetStringObj(result, "sendto(2): ", -1);
Tcl_AppendStringsToObj(result, strerror(errno), NULL);
return TCL_ERROR;
}
return TCL_OK;
}
#define APD_MAX_LEN (65536*2+4096)
char *GetPacketDescription(char *data, int len, int hexdata)
{
unsigned char *p = (unsigned char*) data;
struct ars_packet pkt;
char *d = malloc(APD_MAX_LEN);
char *ret;
ars_init(&pkt);
if (hexdata) {
ars_set_option(&pkt, ARS_OPT_RAPD_HEXDATA);
}
if (ars_split_packet(p, len, 0, &pkt) != -ARS_OK) {
/* FIXME: handle this error properly */
}
if (ars_d_from_ars(d, APD_MAX_LEN, &pkt) != -ARS_OK) {
/* FIXME: handle this error properly */
}
ars_destroy(&pkt);
ret = strdup(d);
free(d);
return ret;
}
/* Read a packet with a given timeout.
* The function returns -1 on error, non zero on a successful
* read, and 0 when no error occurred but the read must be
* reiterated (possibly before timeout expired).
*
* A zero timeout is valid, and means returns a packet if
* it is already in the buffer. A negative timeout of -1
* means to wait forever. */
int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *); /* pcap-int.h */
static int HpingReadPacket(struct recv_handler *ra, char *pkt, int pktlen, int timeout)
{
struct timeval tv;
int retval, fd = pcap_fileno(ra->rh_pcapfp);
struct pcap_pkthdr hdr;
const unsigned char *d;
fd_set fs;
if (timeout >= 0) {
tv.tv_sec = timeout/1000;
tv.tv_usec = (timeout%1000)*1000;
}
FD_ZERO(&fs);
FD_SET(fd, &fs);
if (timeout >= 0)
retval = select(fd+1, &fs, NULL, NULL, &tv);
else
retval = select(fd+1, &fs, NULL, NULL, NULL);
if (retval == -1) {
if (errno == EINTR)
return 0;
return -1;
} else if (retval == 0) {
return 0;
}
d = pcap_next(ra->rh_pcapfp, &hdr);
if (d == NULL)
return 0;
if (hdr.caplen > pktlen)
hdr.caplen = pktlen;
memcpy(pkt, d, hdr.caplen);
return hdr.caplen;
}
static int HpingRecvPackets(struct recv_handler *ra, Tcl_Interp *interp, Tcl_Obj *o, int timeout, int maxpackets, int rapd, int hexdata)
{
time_t startms = milliseconds();
char _pkt[65535+255];
char *pkt = _pkt;
int lhs = ra->rh_linkhdrsize;
while(1) {
time_t elapsed;
int len;
len = HpingReadPacket(ra, pkt, 65535+255, timeout);
if (len > 0) {
Tcl_Obj *element;
/* Skip the link header */
pkt += lhs;
len -= lhs;
/* Create the entry */
if (rapd) {
char *apd;
apd = GetPacketDescription(pkt, len, hexdata);
if (!apd)
return 1;
element = Tcl_NewStringObj(apd, -1);
free(apd);
} else {
element = Tcl_NewStringObj(pkt, len);
}
Tcl_ListObjAppendElement(interp, o, element);
/* Check if we reached the packets limit */
if (maxpackets) {
maxpackets--;
if (maxpackets == 0)
return 0;
}
}
if (timeout == 0 && len != 0)
continue;
if (timeout >= 0) {
elapsed = milliseconds() - startms;
if (elapsed > timeout)
break;
}
}
return 0;
}
/* hping (recv|recvraw) ifname ?timeout? ?maxpackets?
* A zero timeout means to return only packets already in queue
* A negative timeout means to wait forever
* A zero maxpackets means infinite packets limit.
*
* For default timeout is -1, maxpackets is 0 */
static int __HpingRecvCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[], int rapd, int hexdata)
{
Tcl_Obj *result;
struct recv_handler *ra;
char *ifname;
int timeout = -1; /* specified in ms */
int maxpackets = 1;
if (objc != 3 && objc != 4 && objc != 5) {
Tcl_WrongNumArgs(interp, 2, objv, "ifname ?timeout? ?maxpackets?");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
ifname = Tcl_GetStringFromObj(objv[2], NULL);
if (objc >= 4)
Tcl_GetIntFromObj(interp, objv[3], &timeout);
if (objc == 5)
Tcl_GetIntFromObj(interp, objv[4], &maxpackets);
/* FIXME: check if maxpacket == 0 AND timeout == -1. In such
* a case the function will never return. */
ra = HpingRecvGetHandler(recv_handlers, HPING_IFACE_MAX, ifname, interp);
if (ra == NULL) {
Tcl_SetStringObj(result, "Unable to open the interface", -1);
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
if (HpingRecvPackets(ra, interp, result, timeout, maxpackets, rapd, hexdata))
return TCL_ERROR;
return TCL_OK;
}
/* The two wrappers for the __HpingRecvRawCmd() */
static int HpingRecvRawCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
return __HpingRecvCmd(clientData, interp, objc, objv, 0, 0);
}
static int HpingRecvCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
char *firstarg;
int hexdata = 0;
if (objc >= 3) {
firstarg = Tcl_GetStringFromObj(objv[2], NULL);
if (!strcmp(firstarg, "-hexdata")) {
hexdata = 1;
objc--;
objv++;
}
}
return __HpingRecvCmd(clientData, interp, objc, objv, 1, hexdata);
}
/* hping getinterfaces */
static int HpingGetInterfacesCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct hpingif ifaces[HPING_IFACE_MAX];
int found, i;
Tcl_Obj *result;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 2, objv, "");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
found = hping_get_interfaces(ifaces, HPING_IFACE_MAX);
if (found == -1) {
Tcl_SetStringObj(result, "Listing interfaces: ", -1);
Tcl_AppendStringsToObj(result, strerror(errno), NULL);
return TCL_ERROR;
}
for (i = 0; i < found; i++) {
struct in_addr ia;
char mtu[32];
int j, flags = 0;
snprintf(mtu, 32, "%d", ifaces[i].hif_mtu);
Tcl_AppendStringsToObj(result, "{",
ifaces[i].hif_name, " ",
mtu, " ", NULL);
Tcl_AppendStringsToObj(result, "{", NULL);
for (j = 0; j < ifaces[i].hif_naddr; j++) {
ia.s_addr = ifaces[i].hif_addr[j];
Tcl_AppendStringsToObj(result, inet_ntoa(ia), NULL);
if ((j+1) < ifaces[i].hif_naddr)
Tcl_AppendStringsToObj(result, " ", NULL);
}
Tcl_AppendStringsToObj(result, "}", NULL);
if (ifaces[i].hif_broadcast) {
Tcl_AppendStringsToObj(result, " {", NULL);
for (j = 0; j < ifaces[i].hif_naddr; j++) {
ia.s_addr = ifaces[i].hif_baddr[j];
Tcl_AppendStringsToObj(result, inet_ntoa(ia), NULL);
if ((j+1) < ifaces[i].hif_naddr)
Tcl_AppendStringsToObj(result, " ", NULL);
}
Tcl_AppendStringsToObj(result, "} {", NULL);
} else {
Tcl_AppendStringsToObj(result, " {} {", NULL);
}
if (ifaces[i].hif_loopback) {
Tcl_AppendStringsToObj(result, flags ? " " : "", "LOOPBACK", NULL);
flags++;
}
if (ifaces[i].hif_ptp) {
Tcl_AppendStringsToObj(result, flags ? " " : "", "POINTOPOINT", NULL);
flags++;
}
if (ifaces[i].hif_promisc) {
Tcl_AppendStringsToObj(result, flags ? " " : "", "PROMISC", NULL);
flags++;
}
if (ifaces[i].hif_broadcast) {
Tcl_AppendStringsToObj(result, flags ? " " : "", "BROADCAST", NULL);
flags++;
}
if (ifaces[i].hif_nolink) {
Tcl_AppendStringsToObj(result, flags ? " " : "", "NOLINK", NULL);
flags++;
}
Tcl_AppendStringsToObj(result, "}} ", NULL);
}
return TCL_OK;
}
/* hping outifaddr destaddr */
static int HpingGetOutIfAddrCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct sockaddr_in dest, ifaddr;
Tcl_Obj *result;
char *deststr;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "destaddr");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
deststr = Tcl_GetStringFromObj(objv[2], NULL);
if (resolve_addr((struct sockaddr*)&dest, deststr) == -1) {
Tcl_SetStringObj(result, "Unable to resolve: ", -1);
Tcl_AppendStringsToObj(result, deststr, NULL);
return TCL_ERROR;
}
if (get_output_if(&dest, &ifaddr) == -1) {
Tcl_SetStringObj(result, "Can't get output interface: ", -1);
Tcl_AppendStringsToObj(result, strerror(errno), NULL);
return TCL_ERROR;
}
Tcl_SetStringObj(result, inet_ntoa(ifaddr.sin_addr), -1);
return TCL_OK;
}
/* hping getfield layer field ?skip? packet */
static int HpingGetFieldCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
char *layer, *field, *value, *packet;
int skip = 0;
Tcl_Obj *result;
if (objc != 5 && objc != 6) {
Tcl_WrongNumArgs(interp, 2, objv, "layer field ?skip? packet");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
layer = Tcl_GetStringFromObj(objv[2], NULL);
field = Tcl_GetStringFromObj(objv[3], NULL);
if (objc == 6) {
Tcl_GetIntFromObj(interp, objv[4], &skip);
packet = Tcl_GetStringFromObj(objv[5], NULL);
} else {
packet = Tcl_GetStringFromObj(objv[4], NULL);
}
value = ars_d_field_get(packet, layer, field, skip);
if (value) {
Tcl_SetStringObj(result, value, -1);
free(value);
}
return TCL_OK;
}
/* hping hasfield layer field ?skip? packet */
static int HpingHasFieldCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
char *layer, *field, *packet;
int skip = 0;
Tcl_Obj *result;
if (objc != 5 && objc != 6) {
Tcl_WrongNumArgs(interp, 2, objv, "layer field ?skip? packet");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
layer = Tcl_GetStringFromObj(objv[2], NULL);
field = Tcl_GetStringFromObj(objv[3], NULL);
if (objc == 6) {
Tcl_GetIntFromObj(interp, objv[4], &skip);
packet = Tcl_GetStringFromObj(objv[5], NULL);
} else {
packet = Tcl_GetStringFromObj(objv[4], NULL);
}
if (ars_d_field_off(packet, layer, field, skip, NULL, NULL, NULL))
Tcl_SetIntObj(result, 1);
else
Tcl_SetIntObj(result, 0);
return TCL_OK;
}
/* hping setfield layer field value ?skip? packet */
static int HpingSetFieldCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
char *layer, *field, *value, *packet;
int skip = 0, vstart, vend;
Tcl_Obj *result;
if (objc != 6 && objc != 7) {
Tcl_WrongNumArgs(interp, 2, objv, "layer field value ?skip? packet");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
layer = Tcl_GetStringFromObj(objv[2], NULL);
field = Tcl_GetStringFromObj(objv[3], NULL);
value = Tcl_GetStringFromObj(objv[4], NULL);
if (objc == 7) {
Tcl_GetIntFromObj(interp, objv[5], &skip);
packet = Tcl_GetStringFromObj(objv[6], NULL);
} else {
packet = Tcl_GetStringFromObj(objv[5], NULL);
}
if (!ars_d_field_off(packet, layer, field, skip, NULL, &vstart, &vend)){
Tcl_AppendStringsToObj(result, "no such field ", layer, " ", field, NULL);
return TCL_ERROR;
}
Tcl_AppendToObj(result, packet, vstart);
Tcl_AppendObjToObj(result, objv[4]);
Tcl_AppendStringsToObj(result, packet+vend+1, NULL);
return TCL_OK;
}
/* hping delfield layer field ?skip? packet */
static int HpingDelFieldCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
char *layer, *field, *packet;
int skip = 0, fstart, vend;
Tcl_Obj *result;
if (objc != 5 && objc != 6) {
Tcl_WrongNumArgs(interp, 2, objv, "layer field ?skip? packet");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
layer = Tcl_GetStringFromObj(objv[2], NULL);
field = Tcl_GetStringFromObj(objv[3], NULL);
if (objc == 6) {
Tcl_GetIntFromObj(interp, objv[4], &skip);
packet = Tcl_GetStringFromObj(objv[5], NULL);
} else {
packet = Tcl_GetStringFromObj(objv[4], NULL);
}
if (!ars_d_field_off(packet, layer, field, skip, &fstart, NULL, &vend)){
if (objc == 6)
Tcl_AppendObjToObj(result, objv[5]);
else
Tcl_AppendObjToObj(result, objv[4]);
return TCL_OK;
}
if (packet[fstart-1] == ',' &&
(packet[vend+1] == ')' || packet[vend+1] == ',')) {
fstart--;
}
Tcl_AppendToObj(result, packet, fstart);
if (packet[fstart-1] == '(' && packet[vend+1] == ',')
packet++;
Tcl_AppendStringsToObj(result, packet+vend+1, NULL);
return TCL_OK;
}
/* hping checksum string */
static int HpingChecksumCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
Tcl_Obj *result;
u_int16_t cksum;
char *data;
int len;
result = Tcl_GetObjResult(interp);
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "string");
return TCL_ERROR;
}
data = Tcl_GetStringFromObj(objv[2], &len);
cksum = ars_cksum(data, len);
Tcl_SetIntObj(result, cksum);
return TCL_OK;
}
/* hping setfilter ifname filter */
static int HpingSetFilterCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct recv_handler *ra;
struct bpf_program bpfp;
char *ifname, *filter;
Tcl_Obj *result;
result = Tcl_GetObjResult(interp);
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "ifname filter");
return TCL_ERROR;
}
ifname = Tcl_GetStringFromObj(objv[2], NULL);
filter = Tcl_GetStringFromObj(objv[3], NULL);
/* Get the interface pcap handler */
ra = HpingRecvGetHandler(recv_handlers, HPING_IFACE_MAX, ifname, interp);
if (ra == NULL) {
Tcl_SetStringObj(result, "Unable to open the interface setting the pcap filter", -1);
return TCL_ERROR;
}
/* Compile and set the filter */
if (pcap_compile(ra->rh_pcapfp, &bpfp, filter, 0, 0) == -1) {
Tcl_AppendStringsToObj(result, "Error compiling the pcap filter: '", pcap_geterr(ra->rh_pcapfp), "'", NULL);
return TCL_ERROR;
}
if (pcap_setfilter(ra->rh_pcapfp, &bpfp) == -1) {
Tcl_AppendStringsToObj(result, "Error setting the pcap filter: '", pcap_geterr(ra->rh_pcapfp), "'", NULL);
pcap_freecode(&bpfp);
return TCL_ERROR;
}
pcap_freecode(&bpfp);
return TCL_OK;
}
/* event handler for the [hping event] command. */
void HpingEventHandler(void *clientData, int mask)
{
struct recv_handler *ra = clientData;
if (Tcl_EvalObjEx(ra->rh_interp, ra->rh_handlerscript, TCL_EVAL_GLOBAL|TCL_EVAL_DIRECT) != TCL_OK) {
Tcl_BackgroundError(ra->rh_interp);
}
}
/* hping event ifname ?script? */
static int HpingEventCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct recv_handler *ra;
char *ifname;
Tcl_Obj *result;
int scriptlen;
result = Tcl_GetObjResult(interp);
if (objc != 3 && objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "ifname ?script?");
return TCL_ERROR;
}
ifname = Tcl_GetStringFromObj(objv[2], NULL);
/* Get the interface pcap handler */
ra = HpingRecvGetHandler(recv_handlers, HPING_IFACE_MAX, ifname, interp);
if (ra == NULL) {
Tcl_SetStringObj(result, "Unable to open the interface setting the pcap filter", -1);
return TCL_ERROR;
}
/* If the script argument is missing, return the script
* currently set if any */
if(objc == 3) {
if(ra->rh_interp != NULL)
Tcl_SetObjResult(interp, ra->rh_handlerscript);
return TCL_OK;
}
/* Set the script in the target interface */
if (ra->rh_interp != NULL)
Tcl_DecrRefCount(ra->rh_handlerscript);
/* CHeck if the script is empty, if so clear the handler */
Tcl_GetStringFromObj(objv[3], &scriptlen);
if (scriptlen != 0) {
ra->rh_handlerscript = objv[3];
Tcl_IncrRefCount(objv[3]);
ra->rh_interp = interp;
/* Register the handler for this file descriptor */
Tcl_CreateFileHandler(pcap_fileno(ra->rh_pcapfp), TCL_READABLE,
HpingEventHandler, (void*)ra);
} else {
ra->rh_interp = NULL;
}
return TCL_OK;
}
/* --------------------------------- Misc ----------------------------------- */
#if 0
/* hping setfilter ifname filter */
static int HpingSoftrealtimeCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
struct sched_param sp;
int min, max, virtual_priority;
struct Tcl_Obj *result;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "priority (in the range 0-99)");
return TCL_ERROR;
}
result = Tcl_GetObjResult(interp);
Tcl_GetIntFromObj(interp, objv[2], &virtual_priority);
if (virtual_priority < 0 || virtual_priority > 99) {
Tcl_SetStringObj(result, "priority must be in the range 0-99", -1);
return TCL_ERROR;
}
min = sched_get_priority_min(SCHED_RR);
max = sched_get_priority_max(SCHED_RR);
/* Map the virutal priority to the range supported in this OS */
{
float vmul = (max-min)+1;
vmul /= 100;
sp.sched_priority = min + (int)(virtual_priority*vmul);
}
/* sched_setscheduler() may fail, but we just ignore the error */
sched_setscheduler(0, SCHED_RR, &sp);
return TCL_OK;
}
#endif
/* ---------------------- hping command implementation ---------------------- */
struct subcmd {
char *name;
int (*proc)(ClientData cd, Tcl_Interp *i, int, Tcl_Obj *CONST objv[]);
} subcmds[] = {
{ "resolve", HpingResolveCmd },
{ "send", HpingSendCmd },
{ "sendraw", HpingSendRawCmd },
{ "recv", HpingRecvCmd },
{ "recvraw", HpingRecvRawCmd },
{ "setfilter", HpingSetFilterCmd },
{ "iflist", HpingGetInterfacesCmd },
{ "outifa", HpingGetOutIfAddrCmd },
{ "getfield", HpingGetFieldCmd },
{ "hasfield", HpingHasFieldCmd },
{ "setfield", HpingSetFieldCmd },
{ "delfield", HpingDelFieldCmd },
{ "checksum", HpingChecksumCmd },
{ "event", HpingEventCmd },
#if 0
{ "softrealtime", HpingSoftrealtimeCmd },
#endif
{ NULL, NULL },
};
static int HpingObjCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
int i = 0;
char *scmd;
Tcl_Obj *result;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
return TCL_ERROR;
}
scmd = Tcl_GetStringFromObj(objv[1], NULL);
while(subcmds[i].name) {
if (!strcmp(scmd, subcmds[i].name))
return subcmds[i].proc(clientData, interp, objc, objv);
i++;
}
result = Tcl_GetObjResult(interp);
Tcl_SetStringObj(result, "Bad option ", -1);
Tcl_AppendStringsToObj(result, "\"", scmd, "\"", " must be: ", NULL);
i = 0;
while(subcmds[i].name) {
Tcl_AppendStringsToObj(result, subcmds[i].name, NULL);
if (subcmds[i+1].name)
Tcl_AppendStringsToObj(result, ", ", NULL);
i++;
}
return TCL_ERROR;
}
/* -------------------- multiprecision math commands ------------------------ */
#if 0
/* XXX: actually this binding is pretty naive, we are not using
* a Tcl dual-port rappresentation for bignums, instead we convert from/to
* string rappresentation, wasting the almost decent performences
* of the sbignum library (and even worse, because to/from string conversion
* is not optimized). Btw, for now this seems enough, there will be
* time to improve on this in the future if needed, without to break the API. */
static int BigBasicObjCmd(ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *CONST objv[])
{
Tcl_Obj *result;
mpz_t res, t;
char *s = NULL, *cmd;
cmd = Tcl_GetStringFromObj(objv[0], NULL);
objc--;
objv++;
result = Tcl_GetObjResult(interp);
mpz_init(res);
mpz_init(t);
mpz_setzero(res);
if (cmd[0] == '*' || cmd[0] == '/') {
if (mpz_set_ui(res, 1) != SBN_OK)
goto err;
}
if ((cmd[0] == '/' || cmd[0] == '%') && objc) {
s = Tcl_GetStringFromObj(objv[0], NULL);
if (mpz_set_str(res, s, 0) != SBN_OK)
goto err;
objc--;
objv++;
}
while(objc--) {
s = Tcl_GetStringFromObj(objv[0], NULL);
if (mpz_set_str(t, s, 0) != SBN_OK)
goto err;
switch(cmd[0]) {
case '+':
if (mpz_add(res, res, t) != SBN_OK)
goto err;
break;
case '-':
if (mpz_sub(res, res, t) != SBN_OK)
goto err;
break;
case '*':
if (mpz_mul(res, res, t) != SBN_OK)
goto err;
break;
case '/':
if (mpz_tdiv_q(res, res, t) != SBN_OK)
goto err;
break;
case '%':
if (mpz_mod(res, res, t) != SBN_OK)
goto err;
break;
}
objv++;
}
if ((s = mpz_get_str(NULL, 10, res)) == NULL)
goto err;
Tcl_SetStringObj(result, s, -1);
free(s);
mpz_clear(res);
mpz_clear(t);
return TCL_OK;
err:
mpz_clear(res);
mpz_clear(t);
Tcl_AppendStringsToObj(result, "Not a valid big number: ", s, NULL);
return TCL_ERROR;
}
#endif
/* -------------------------- Mpz object implementation --------------------- */
static void Tcl_SetMpzObj(Tcl_Obj *objPtr, mpz_ptr val);
//static Tcl_Obj *Tcl_NewMpzObj(void);
static void FreeMpzInternalRep(Tcl_Obj *objPtr);
static void DupMpzInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);
static void UpdateStringOfMpz(Tcl_Obj *objPtr);
static int SetMpzFromAny(struct Tcl_Interp* interp, Tcl_Obj *objPtr);
struct Tcl_ObjType tclMpzType = {
"mpz",
FreeMpzInternalRep,
DupMpzInternalRep,
UpdateStringOfMpz,
SetMpzFromAny
};
/* This function set objPtr as an mpz object with value
* 'val'. If 'val' == NULL, the mpz object is set to zero. */
void Tcl_SetMpzObj(Tcl_Obj *objPtr, mpz_ptr val)
{
Tcl_ObjType *typePtr;
mpz_ptr mpzPtr;
/* It's not a good idea to set a shared object... */
if (Tcl_IsShared(objPtr)) {
panic("Tcl_SetMpzObj called with shared object");
}
/* Free the old object private data and invalidate the string
* representation. */
typePtr = objPtr->typePtr;
if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
(*typePtr->freeIntRepProc)(objPtr);
}
Tcl_InvalidateStringRep(objPtr);
/* Allocate and initialize a new bignum */
mpzPtr = (mpz_ptr) ckalloc(sizeof(struct struct_sbnz));
mpz_init(mpzPtr);
if (val && mpz_set(mpzPtr, val) != SBN_OK) {
panic("Out of memory in Tcl_SetMpzObj");
}
/* Set it as object private data, and type */
objPtr->typePtr = &tclMpzType;
objPtr->internalRep.otherValuePtr = (void*) mpzPtr;
}
/* Return an mpz from the object. If the object is not of type mpz
* an attempt to convert it to mpz is done. On failure (the string
* representation of the object can't be converted on a bignum)