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/* rapd.c -- Reverse APD, from ARS packet to APD string description.
* Copyright (C) 2003 Salvatore Sanfilippo
* All rights reserved. */
/* $Id: rapd.c,v 1.7 2004/04/10 00:45:11 antirez Exp $ */
#include <sys/types.h>
#include <netinet/in.h>
#include <ctype.h>
#include "ars.h"
void trimlastchar(char *s)
{
int len = strlen(s);
s[len-1] = '\0';
}
int ars_d_from_ars(char *dest, size_t len, struct ars_packet *pkt)
{
int j, err;
struct adbuf buf;
if (len <= 0)
return -ARS_OK;
if (adbuf_init(&buf))
return -ARS_NOMEM;
for (j = 0; j < pkt->p_layer_nr; j++) {
__D(printf("ReverseAPD-ing layer %d\n", j);)
/* Skip NULL compilers */
if (ars_linfo[pkt->p_layer[j].l_type].li_rapd != NULL) {
/* Call the layer to string converter */
err = ars_linfo[pkt->p_layer[j].l_type].li_rapd(&buf, pkt, j);
if (err != -ARS_OK) {
adbuf_free(&buf);
return err;
}
}
}
adbuf_rtrim(&buf, 1);
strlcpy(dest, adbuf_ptr(&buf), len);
adbuf_free(&buf);
return -ARS_OK;
}
/* layer rapd methods */
int ars_rapd_ip(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_iphdr *ip = pkt->p_layer[layer].l_data;
struct ars_iphdr *defip = pkt->p_default[pkt->p_layer[layer].l_type];
adbuf_printf(dest, "ip(");
if (!defip || ip->ihl != defip->ihl)
adbuf_printf(dest, "ihl=0x%1x,", ip->ihl);
if (!defip || ip->version != defip->version)
adbuf_printf(dest, "ver=0x%1x,", ip->version);
if (!defip || ip->tos != defip->tos)
adbuf_printf(dest, "tos=0x%02x,", ip->tos);
adbuf_printf(dest, "totlen=%u,", ntohs(ip->tot_len));
if (!defip || ip->id != defip->id)
adbuf_printf(dest, "id=%u,", ntohs(ip->id));
adbuf_printf(dest, "fragoff=%u,",
(ntohs(ip->frag_off) & 0x1FFF) << 3);
if (!defip ||
(ip->frag_off & ARS_IP_MF) != (defip->frag_off & ARS_IP_MF))
adbuf_printf(dest, "mf=%d,",
(htons(ip->frag_off) & ARS_IP_MF) != 0);
if (!defip ||
(ip->frag_off & ARS_IP_DF) != (defip->frag_off & ARS_IP_DF))
adbuf_printf(dest, "df=%d,",
(htons(ip->frag_off) & ARS_IP_DF) != 0);
if (!defip ||
(ip->frag_off & ARS_IP_RF) != (defip->frag_off & ARS_IP_RF))
adbuf_printf(dest, "rf=%d,",
(htons(ip->frag_off) & ARS_IP_RF) != 0);
if (!defip || ip->ttl != defip->ttl)
adbuf_printf(dest, "ttl=%u,", ip->ttl);
/* TODO: the 'proto' field may not be added if the protocl
* that follows this layer looks as specified. */
adbuf_printf(dest, "proto=%u,", ip->protocol);
adbuf_printf(dest, "cksum=0x%04x,", ip->check);
{
unsigned char *x = (unsigned char*) &ip->saddr;
adbuf_printf(dest, "saddr=%u.%u.%u.%u,",
x[0], x[1], x[2], x[3]);
x = (unsigned char*) &ip->daddr;
adbuf_printf(dest, "daddr=%u.%u.%u.%u",
x[0], x[1], x[2], x[3]);
}
adbuf_printf(dest, ")+");
return -ARS_OK;
}
int ars_rapd_ipopt(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_ipopt ipopt;
int len = pkt->p_layer[layer].l_size;
unsigned char *optp = pkt->p_layer[layer].l_data;
int optlen, i;
/* ip options may not be naturally aligned */
memcpy(&ipopt, pkt->p_layer[layer].l_data, len);
optlen = ipopt.len;
switch(ipopt.kind) {
case ARS_IPOPT_EOL:
adbuf_printf(dest, "ip.eol()+");
break;
case ARS_IPOPT_NOP:
adbuf_printf(dest, "ip.nop()+");
break;
case ARS_IPOPT_RR:
case ARS_IPOPT_LSRR:
case ARS_IPOPT_SSRR:
{
int ptr = 4;
char *optname = "";
switch(ipopt.kind) {
case ARS_IPOPT_RR: optname="rr"; break;
case ARS_IPOPT_LSRR: optname="lsrr"; break;
case ARS_IPOPT_SSRR: optname="ssrr"; break;
}
adbuf_printf(dest, "ip.%s(ptr=%u,data=",
optname, ipopt.un.rr.ptr);
while(1) {
unsigned char *x;
if (ptr > 37 ||
ptr > (optlen-3))
break;
x = optp + ptr - 1;
adbuf_printf(dest, "%u.%u.%u.%u/",
x[0],x[1],x[2],x[3]);
ptr += 4;
}
if (ptr > 4)
adbuf_rtrim(dest, 1);
adbuf_printf(dest, ")+");
}
break;
case ARS_IPOPT_TIMESTAMP:
{
int ptr = 5;
int overflow = (ipopt.un.ts.flags & 0xF0)>>4;
int flags = ipopt.un.ts.flags & 0xF;
char *strflags;
adbuf_printf(dest, "ip.ts(ptr=%u,", ipopt.un.ts.ptr);
switch(flags) {
case ARS_IPOPT_TS_TSONLY: strflags="tsonly"; break;
case ARS_IPOPT_TS_TSANDADDR: strflags="tsandaddr"; break;
case ARS_IPOPT_TS_PRESPEC: strflags="prespec"; break;
default: strflags=NULL; break;
}
if (strflags) {
adbuf_printf(dest, "flags=%s,", strflags);
} else {
adbuf_printf(dest, "flags=%u,", flags);
}
adbuf_printf(dest, "overflow=%u,data=", overflow);
while(1) {
unsigned char *x;
__u32 ts;
if (ptr > 37 ||
ptr > (optlen-4))
break;
if (flags != ARS_IPOPT_TS_TSANDADDR &&
flags != ARS_IPOPT_TS_PRESPEC) {
memcpy(&ts, optp+ptr-1, 4);
ts = ntohl(ts);
adbuf_printf(dest, "%u/", ts);
ptr += 4;
} else {
x = optp + ptr - 1;
memcpy(&ts, x+4, 4);
adbuf_printf(dest, "%u@%u.%u.%u.%u/",
ts,x[0],x[1],x[2],x[3]);
ptr += 8;
}
}
if (ptr > 5)
adbuf_rtrim(dest, 1);
adbuf_printf(dest, ")+");
}
break;
default:
adbuf_printf(dest, "ip.unknown(hex=");
for (i = 0; i < optlen; i++) {
adbuf_printf(dest, "0x%02x", optp[i]);
}
adbuf_printf(dest, ")+");
break;
}
return -ARS_OK;
}
int ars_rapd_icmp(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_icmphdr *icmp = pkt->p_layer[layer].l_data;
adbuf_printf(dest, "icmp(");
adbuf_printf(dest, "type=%u,", icmp->type);
adbuf_printf(dest, "code=%u,", icmp->code);
if (icmp->type == ARS_ICMP_DEST_UNREACH ||
icmp->type == ARS_ICMP_TIME_EXCEEDED ||
icmp->type == ARS_ICMP_PARAMETERPROB ||
icmp->type == ARS_ICMP_SOURCE_QUENCH)
{
adbuf_printf(dest, "unused=%lu,", (unsigned long)
ntohl(icmp->un.gateway));
}
if (icmp->type == ARS_ICMP_ECHOREPLY ||
icmp->type == ARS_ICMP_ECHO ||
icmp->type == ARS_ICMP_TIMESTAMP ||
icmp->type == ARS_ICMP_TIMESTAMPREPLY ||
icmp->type == ARS_ICMP_INFO_REQUEST ||
icmp->type == ARS_ICMP_INFO_REPLY)
{
adbuf_printf(dest, "id=%u,", ntohs(icmp->un.echo.id));
adbuf_printf(dest, "seq=%u,", ntohs(icmp->un.echo.sequence));
}
if (icmp->type == ARS_ICMP_REDIRECT) {
unsigned char x[4];
memcpy(x, &icmp->un.gateway, 4);
adbuf_printf(dest, "gw=%u.%u.%u.%u,",
x[0], x[1], x[2], x[3]);
}
adbuf_rtrim(dest, 1);
adbuf_printf(dest, ")+");
return -ARS_OK;
}
int ars_rapd_udp(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_udphdr *udp = pkt->p_layer[layer].l_data;
//struct ars_udphdr *defudp = pkt->p_default[pkt->p_layer[layer].l_type];
adbuf_printf(dest, "udp(");
adbuf_printf(dest, "sport=%u,", ntohs(udp->uh_sport));
adbuf_printf(dest, "dport=%u,", ntohs(udp->uh_dport));
adbuf_printf(dest, "len=%u,", ntohs(udp->uh_ulen));
adbuf_printf(dest, "cksum=0x%04x", ntohs(udp->uh_sum));
adbuf_printf(dest, ")+");
return -ARS_OK;
}
int ars_rapd_tcp(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_tcphdr *tcp = pkt->p_layer[layer].l_data;
struct ars_tcphdr *deftcp = pkt->p_default[pkt->p_layer[layer].l_type];
adbuf_printf(dest, "tcp(");
adbuf_printf(dest, "sport=%u,", ntohs(tcp->th_sport));
adbuf_printf(dest, "dport=%u,", ntohs(tcp->th_dport));
adbuf_printf(dest, "seq=%lu,", ntohl(tcp->th_seq));
adbuf_printf(dest, "ack=%lu,", ntohl(tcp->th_ack));
if (!deftcp || tcp->th_x2 != deftcp->th_x2)
adbuf_printf(dest, "x2=0x%1x,", tcp->th_x2);
if (!deftcp || tcp->th_off != deftcp->th_off)
adbuf_printf(dest, "off=%u,", tcp->th_off);
adbuf_printf(dest, "flags=");
if (tcp->th_flags & ARS_TCP_TH_FIN) adbuf_printf(dest, "f");
if (tcp->th_flags & ARS_TCP_TH_SYN) adbuf_printf(dest, "s");
if (tcp->th_flags & ARS_TCP_TH_RST) adbuf_printf(dest, "r");
if (tcp->th_flags & ARS_TCP_TH_PUSH) adbuf_printf(dest, "p");
if (tcp->th_flags & ARS_TCP_TH_ACK) adbuf_printf(dest, "a");
if (tcp->th_flags & ARS_TCP_TH_URG) adbuf_printf(dest, "u");
if (tcp->th_flags & ARS_TCP_TH_X) adbuf_printf(dest, "x");
if (tcp->th_flags & ARS_TCP_TH_Y) adbuf_printf(dest, "y");
adbuf_printf(dest, ",");
adbuf_printf(dest, "win=%u,", ntohs(tcp->th_win));
adbuf_printf(dest, "cksum=0x%04x,", ntohs(tcp->th_sum));
if (!deftcp || tcp->th_urp != deftcp->th_urp)
adbuf_printf(dest, "urp=%u,", ntohs(tcp->th_urp));
adbuf_rtrim(dest, 1);
adbuf_printf(dest, ")+");
return -ARS_OK;
}
int ars_rapd_tcpopt(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_tcpopt tcpopt;
int len = pkt->p_layer[layer].l_size;
unsigned char *optp = pkt->p_layer[layer].l_data;
int optlen, i;
/* tcp options may not be naturally aligned */
memcpy(&tcpopt, pkt->p_layer[layer].l_data, len);
optlen = tcpopt.len;
switch(tcpopt.kind) {
case ARS_TCPOPT_EOL:
adbuf_printf(dest, "tcp.eol()+");
break;
case ARS_TCPOPT_NOP:
adbuf_printf(dest, "tcp.nop()+");
break;
case ARS_TCPOPT_MAXSEG:
adbuf_printf(dest, "tcp.mss(size=%u)+",
ntohs(tcpopt.un.mss.size));
break;
case ARS_TCPOPT_WINDOW:
adbuf_printf(dest, "tcp.wscale(shift=%u)+",
tcpopt.un.win.shift);
break;
case ARS_TCPOPT_SACK_PERM:
adbuf_printf(dest, "tcp.sackperm()+");
break;
case ARS_TCPOPT_SACK:
adbuf_printf(dest, "tcp.sack(blocks=");
{
int blocks = (optlen-2)/8;
for (i = 0; i < blocks; i++) {
u_int32_t s_orig, s_size;
memcpy(&s_orig, tcpopt.un.sack[i].origin, 4);
memcpy(&s_size, tcpopt.un.sack[i].size, 4);
adbuf_printf(dest, "%lu-%lu",
ntohl(s_orig),
ntohl(s_size));
if ((i+1) != blocks)
adbuf_addchar(dest, '/');
}
}
adbuf_printf(dest, ")+");
break;
case ARS_TCPOPT_ECHOREQUEST:
{
__u32 info;
memcpy(&info, tcpopt.un.echo.info, 4);
adbuf_printf(dest, "tcp.echoreq(info=%lu)+",
(unsigned long) ntohl(info));
}
break;
case ARS_TCPOPT_ECHOREPLY:
{
__u32 info;
memcpy(&info, tcpopt.un.echo.info, 4);
adbuf_printf(dest, "tcp.echoreply(info=%lu)+",
(unsigned long) ntohl(info));
}
break;
case ARS_TCPOPT_TIMESTAMP:
{
__u32 tsval, tsecr;
memcpy(&tsval, tcpopt.un.timestamp.tsval, 4);
memcpy(&tsecr, tcpopt.un.timestamp.tsecr, 4);
adbuf_printf(dest, "tcp.timestamp(val=%lu,ecr=%lu)+",
(unsigned long) ntohl(tsval),
(unsigned long) ntohl(tsecr));
}
break;
default:
adbuf_printf(dest, "tcp.unknown(hex=");
for (i = 0; i < optlen; i++) {
adbuf_printf(dest, "%02x", optp[i]);
}
adbuf_printf(dest, ")+");
break;
}
return -ARS_OK;
}
int ars_rapd_igrp(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_igrphdr *igrp = pkt->p_layer[layer].l_data;
adbuf_printf(dest, "igrp(");
adbuf_printf(dest, "version=%u,", igrp->version);
if (igrp->opcode == ARS_IGRP_OPCODE_UPDATE) {
adbuf_printf(dest, "opcode=update,", igrp->opcode);
} else if (igrp->opcode == ARS_IGRP_OPCODE_REQUEST) {
adbuf_printf(dest, "opcode=request,", igrp->opcode);
} else {
adbuf_printf(dest, "opcode=%u,", igrp->opcode);
}
adbuf_printf(dest, "edition=%u,", igrp->edition);
adbuf_printf(dest, "autosys=%u,", htons(igrp->autosys));
adbuf_printf(dest, "interior=%u,", htons(igrp->interior));
adbuf_printf(dest, "system=%u,", htons(igrp->system));
adbuf_printf(dest, "exterior=%u,", htons(igrp->exterior));
adbuf_printf(dest, "cksum=0x%04x", ntohs(igrp->checksum));
adbuf_printf(dest, ")+");
return -ARS_OK;
}
static u_int32_t get_net_int24(void *ptr)
{
unsigned char *x = (unsigned char*)ptr;
u_int32_t u;
u = x[0] <<16 | x[1] << 8 | x[2];
return u;
}
int ars_rapd_igrpentry(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
struct ars_igrpentry *entry = pkt->p_layer[layer].l_data;
unsigned char *x = (unsigned char*) entry->destination;
adbuf_printf(dest, "igrp.entry(");
adbuf_printf(dest, "dest=%u.%u.%u,", x[0], x[1], x[2]);
adbuf_printf(dest, "delay=%u,", get_net_int24(entry->delay));
adbuf_printf(dest, "bandwidth=%u,", get_net_int24(entry->bandwidth));
adbuf_printf(dest, "mtu=%u,", entry->mtu[0] << 8 | entry->mtu[1]);
adbuf_printf(dest, "reliability=%u,", entry->reliability);
adbuf_printf(dest, "load=%u,", entry->load);
adbuf_printf(dest, "hopcount=%u", entry->hopcount);
adbuf_printf(dest, ")+");
return -ARS_OK;
}
int ars_rapd_data(struct adbuf *dest, struct ars_packet *pkt, int layer)
{
unsigned char *data = pkt->p_layer[layer].l_data;
int dlen = pkt->p_layer[layer].l_size, i;
if (ars_test_option(pkt, ARS_OPT_RAPD_HEXDATA)) {
adbuf_printf(dest, "data(hex=");
for (i = 0; i < dlen; i++) {
adbuf_printf(dest, "%02x", data[i]);
}
adbuf_printf(dest, ")+");
} else {
adbuf_printf(dest, "data(str=");
for (i = 0; i < dlen; i++) {
/* escape non-printable chars and chars
* having special meanings in APD packets. */
if (isgraph(data[i]) &&
data[i] != '(' &&
data[i] != ')' &&
data[i] != '+' &&
data[i] != ',' &&
data[i] != '=')
adbuf_printf(dest, "%c", data[i]);
else
adbuf_printf(dest, "\\%02x", data[i]);
}
adbuf_printf(dest, ")+");
}
return 0;
}
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