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analyser.c
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analyser.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <arpa/inet.h>
#include "analyser.h"
#include "proto_headers.h"
#define UPDATE_DST 1
#define UPDATE_SRC 2
#define UPDATE_PRO 4
#define UPDATE_INFO 8
static void free_analytree(struct pkt_analytree *analytree)
{
if (analytree == NULL)
return ;
free_analytree(analytree->child);
analytree->child = NULL;
free_analytree(analytree->next);
analytree->next = NULL;
free(analytree);
}
static int icmpv4_dump(struct pkt_summary *summ, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int size)
{
struct pkt_analytree *atree;
struct pkt_analytree *child;
struct npt_icmpv4_hdr *hdr;
uint8_t type;
uint8_t code;
uint16_t checksum;
uint16_t ident;
uint16_t seq_num;
char *pchar;
int ret;
ret = 0;
hdr = (struct npt_icmpv4_hdr *)data;
type = hdr->icmp_type;
code = hdr->icmp_code;
checksum = ntohs(hdr->icmp_sum);
ident = ntohs(hdr->hun.echo.id);
seq_num = ntohs(hdr->hun.echo.seq);
if (type == ICMP_ECHO)
pchar = "Echo (ping) request";
else if (type == ICMP_ECHOREPLY)
pchar = "Echo (ping) reply";
else
pchar = "";
if (size < NPT_ICMPV4_ECHO_H)
goto err;
ANALY_TREE_ADD_PROTO(err, atree, "ICMP protocol");
ANALY_TREE_ADD_FST_COMM(err, atree, child, "Type: %u (%s)", type, pchar);
ANALY_TREE_ADD_COMM(err, child, "Code: %u", code);
if (type == ICMP_ECHOREPLY || type == ICMP_ECHO) {
ANALY_TREE_ADD_COMM(err, child, "Checksum: %u", checksum);
ANALY_TREE_ADD_COMM(err, child, "Identifier: %u", ident);
ANALY_TREE_ADD_COMM(err, child, "Sequence number: %u", seq_num);
} else {
ANALY_TREE_ADD_COMM(err, child, "Checksum: %u", checksum);
}
snprintf(summ->proto, STR_PROTO_LEN, "ICMP");
snprintf(summ->info, STR_INFO_LEN, "%s", pchar);
ret = UPDATE_PRO | UPDATE_INFO;
*analytree = atree;
return ret;
err:
free_analytree(atree);
*analytree = NULL;
return -1;
}
static int tcp_dump(struct pkt_summary *summ, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int size)
{
struct pkt_analytree *atree;
struct pkt_analytree *child;
struct npt_tcp_hdr *hdr;
uint16_t sport; /* source port */
uint16_t dport; /* destination port */
uint32_t seq;
uint32_t ack;
uint16_t hdr_len;
uint8_t tcp_flags;
uint16_t win; /* window */
uint16_t sum; /* checksum */
uint16_t urp; /* urgent pointer */
int ret;
ret = 0;
hdr = (struct npt_tcp_hdr *)data;
sport = ntohs(hdr->th_sport);
dport = ntohs(hdr->th_dport);
seq = ntohl(hdr->th_seq);
ack = ntohl(hdr->th_ack);
hdr_len = hdr->th_off;
tcp_flags = hdr->th_flags;
win = ntohs(hdr->th_win);
sum = ntohs(hdr->th_sum);
urp = ntohs(hdr->th_urp);
if (size < NPT_TCP_H)
goto err;
ANALY_TREE_ADD_PROTO(err, atree, "TCP protocol");
ANALY_TREE_ADD_FST_COMM(err, atree, child, "Source port: %u", sport);
ANALY_TREE_ADD_COMM(err, child, "Destination port: %u", dport);
ANALY_TREE_ADD_COMM(err, child, "seq: %u", seq);
ANALY_TREE_ADD_COMM(err, child, "ack: %u", ack);
ANALY_TREE_ADD_COMM(err, child, "hdr length: %u", hdr_len);
ANALY_TREE_ADD_COMM(err, child, "flag: 0x%u", tcp_flags);
ANALY_TREE_ADD_COMM(err, child, "win: %u", win);
ANALY_TREE_ADD_COMM(err, child, "sum: %u", sum);
ANALY_TREE_ADD_COMM(err, child, "urp: %u", urp);
snprintf(summ->proto, STR_PROTO_LEN, "TCP");
ret = UPDATE_PRO;
*analytree = atree;
return ret;
err:
free_analytree(atree);
*analytree = NULL;
return -1;
}
static int udp_dump(struct pkt_summary *summ, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int size)
{
struct pkt_analytree *atree;
struct pkt_analytree *child;
struct npt_udp_hdr *hdr;
uint16_t sport; /* source port */
uint16_t dport; /* destination port */
uint16_t ulen; /* length */
uint16_t sum; /* checksum */
int ret;
ret = 0;
hdr = (struct npt_udp_hdr *)data;
sport = ntohs(hdr->uh_sport);
dport = ntohs(hdr->uh_dport);
ulen = ntohs(hdr->uh_ulen);
sum = ntohs(hdr->uh_sum);
if (size < NPT_UDP_H)
goto err;
ANALY_TREE_ADD_PROTO(err, atree, "UDP protocol");
ANALY_TREE_ADD_FST_COMM(err, atree, child, "Source port: %u", sport);
ANALY_TREE_ADD_COMM(err, child, "Destination port: %u", dport);
ANALY_TREE_ADD_COMM(err, child, "udp length: %u", ulen);
ANALY_TREE_ADD_COMM(err, child, "check sum : 0x%x", sum);
snprintf(summ->proto, STR_PROTO_LEN, "UDP");
ret = UPDATE_PRO;
*analytree = atree;
return ret;
err:
free_analytree(atree);
*analytree = NULL;
return -1;
}
static int arp_dump(struct pkt_summary *summ, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int size)
{
struct pkt_analytree *atree;
struct pkt_analytree *child;
struct npt_arp_hdr *hdr;
uint16_t hrd; /* format of hardware address */
uint16_t pro; /* format of protocol address */
uint8_t hln; /* length of hardware address */
uint8_t pln; /* length of protocol address */
uint16_t op; /* operation type */
char *htype;
char *optype;
int ret;
ret = 0;
hdr = (struct npt_arp_hdr *)data;
if (size < NPT_ARP_H)
goto err;
hrd = ntohs(hdr->ar_hrd);
pro = ntohs(hdr->ar_pro);
hln = hdr->ar_hln;
pln = hdr->ar_pln;
op = ntohs(hdr->ar_op);
switch (hrd) {
case ARPHRD_NETROM:
htype = "from KA9Q: NET/ROM pseudo";
break;
case ARPHRD_ETHER:
htype = "Ethernet 10Mbps";
break;
case ARPHRD_EETHER:
htype = "Experimental Ethernet";
break;
case ARPHRD_AX25:
htype = "AX.25 Level 2";
break;
case ARPHRD_PRONET:
htype = "PROnet token ring";
break;
case ARPHRD_CHAOS:
htype = "Chaosnet";
break;
case ARPHRD_IEEE802:
htype = "IEEE 802.2 Ethernet/TR/TB";
break;
case ARPHRD_ARCNET:
htype = "ARCnet";
break;
case ARPHRD_APPLETLK:
htype = "APPLEtalk";
break;
case ARPHRD_LANSTAR:
htype = "Lanstar";
break;
case ARPHRD_DLCI:
htype = "Frame Relay DLCI";
break;
case ARPHRD_ATM:
htype = "ATM";
break;
case ARPHRD_METRICOM:
htype = "Metricom STRIP (new IANA id)";
break;
case ARPHRD_IPSEC:
htype = "IPsec tunnel";
break;
}
switch (op) {
case ARPOP_REQUEST:
optype = "req to resolve address";
break;
case ARPOP_REPLY:
optype = "resp to previous request";
break;
case ARPOP_REVREQUEST:
optype = "req protocol address given hardware";
break;
case ARPOP_REVREPLY:
optype = "resp giving protocol address";
break;
case ARPOP_INVREQUEST:
optype = "req to identify peer";
break;
case ARPOP_INVREPLY:
optype = "resp identifying peer";
break;
}
ANALY_TREE_ADD_PROTO(err, atree, "ARP protocol");
ANALY_TREE_ADD_FST_COMM(err, atree, child, "Hardware type: %s", htype);
ANALY_TREE_ADD_COMM(err, child, "Protocol type: 0x%x", pro);
ANALY_TREE_ADD_COMM(err, child, "Hardware address length: %u", hln);
ANALY_TREE_ADD_COMM(err, child, "Protocol address length: %u", pln);
if (pln == 4 && hln == 6 && pro == ETHERTYPE_IP && hrd == ARPHRD_ETHER) {
ANALY_TREE_ADD_COMM(err, child, "Operation Type : %s", optype);
ANALY_TREE_ADD_COMM(err, child, "Sender MAC address:"
" %.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
data[NPT_ARP_H + 0], data[NPT_ARP_H + 1], data[NPT_ARP_H + 2],
data[NPT_ARP_H + 3], data[NPT_ARP_H + 4], data[NPT_ARP_H + 5]);
ANALY_TREE_ADD_COMM(err, child, "Sender IP address: %u.%u.%u.%u",
data[NPT_ARP_H + 6], data[NPT_ARP_H + 7],
data[NPT_ARP_H + 8], data[NPT_ARP_H + 9]);
ANALY_TREE_ADD_COMM(err, child, "Target MAC address:"
" %.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
data[NPT_ARP_H + 10], data[NPT_ARP_H + 11], data[NPT_ARP_H + 12],
data[NPT_ARP_H + 13], data[NPT_ARP_H + 14], data[NPT_ARP_H + 15]);
ANALY_TREE_ADD_COMM(err, child, "Target IP address: %u.%u.%u.%u",
data[NPT_ARP_H + 16], data[NPT_ARP_H + 17],
data[NPT_ARP_H + 18], data[NPT_ARP_H + 19]);
snprintf(summ->info, STR_INFO_LEN, "Who has %u.%u.%u.%u? Tell %u.%u.%u.%u",
data[NPT_ARP_H + 16], data[NPT_ARP_H + 17],
data[NPT_ARP_H + 18], data[NPT_ARP_H + 19],
data[NPT_ARP_H + 6], data[NPT_ARP_H + 7],
data[NPT_ARP_H + 8], data[NPT_ARP_H + 9]);
ret = UPDATE_INFO;
} else {
ANALY_TREE_ADD_COMM(err, child, "Operation Type : %s", optype);
}
snprintf(summ->proto, STR_PROTO_LEN, "ARP");
ret = ret | UPDATE_PRO;
*analytree = atree;
return ret;
err:
free_analytree(atree);
*analytree = NULL;
return -1;
}
static int ipv4_dump(struct pkt_summary *summ, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int size)
{
uint8_t proto;
uint8_t ip_head_len;
uint8_t ip_ver;
uint16_t ip_len;
struct pkt_analytree *atree;
struct pkt_analytree *child;
struct npt_ipv4_hdr *hdr;
int ret;
ret = 0;
hdr = (struct npt_ipv4_hdr *)data;
ip_ver = hdr->ip_v;
ip_head_len = (hdr->ip_hl) * 4;
ip_len = ntohs(hdr->ip_len);
proto = hdr->ip_p;
if (size < ip_head_len)
goto err;
if (ip_ver != 4)
goto err;
ANALY_TREE_ADD_PROTO(err, atree, "IP protocol");
ANALY_TREE_ADD_FST_COMM(err, atree, child, "Source IP: %u.%u.%u.%u",
hdr->ip_src[0], hdr->ip_src[1], hdr->ip_src[2], hdr->ip_src[3]);
ANALY_TREE_ADD_COMM(err, child, "Destination IP: %u.%u.%u.%u",
hdr->ip_dst[0], hdr->ip_dst[1], hdr->ip_dst[2], hdr->ip_dst[3]);
ANALY_TREE_ADD_COMM(err, child, "ip head length: %u", ip_head_len);
ANALY_TREE_ADD_COMM(err, child, "ip length: %u", ip_len);
ANALY_TREE_ADD_COMM(err, child, "ip version: %u", ip_ver);
ANALY_TREE_ADD_COMM(err, child, "proto : 0x%x", proto);
ret = -1;
switch(proto) {
case IP_PROTO_UDP:
ret = udp_dump(summ, &(atree->next), data + NPT_IPV4_H, size - NPT_IPV4_H);
break;
case IP_PROTO_TCP:
ret = tcp_dump(summ, &(atree->next), data + NPT_IPV4_H, size - NPT_IPV4_H);
break;
case IP_PROTO_ICMPV4:
ret = icmpv4_dump(summ, &(atree->next), data + NPT_IPV4_H, size - NPT_IPV4_H);
break;
}
if (ret < 0 || ((ret & UPDATE_DST) != UPDATE_DST))
snprintf(summ->dst, STR_DST_LEN, "%u.%u.%u.%u",
hdr->ip_dst[0], hdr->ip_dst[1], hdr->ip_dst[2], hdr->ip_dst[3]);
if (ret < 0 || ((ret & UPDATE_SRC) != UPDATE_SRC))
snprintf(summ->src, STR_SRC_LEN, "%u.%u.%u.%u",
hdr->ip_src[0], hdr->ip_src[1], hdr->ip_src[2], hdr->ip_src[3]);
if (ret < 0 || ((ret & UPDATE_INFO) != UPDATE_INFO)) {
if (hdr->ip_dst[0] == 0xff && hdr->ip_dst[1] == 0xff &&
hdr->ip_dst[2] == 0xff && hdr->ip_dst[3] == 0xff) {
snprintf(summ->info, STR_INFO_LEN, "%s broadcast", summ->src);
} else {
snprintf(summ->info, STR_INFO_LEN, "%s -> %s", summ->src, summ->dst);
}
}
if (ret < 0 || ((ret & UPDATE_PRO) != UPDATE_PRO))
snprintf(summ->proto, STR_PROTO_LEN, "IP");
ret = UPDATE_DST | UPDATE_SRC | UPDATE_INFO | UPDATE_PRO;
*analytree = atree;
return ret;
err:
free_analytree(atree);
*analytree = NULL;
return -1;
}
static int ethernet_dump(struct pkt_summary *summ, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int size)
{
uint16_t proto;
struct pkt_analytree *atree;
struct pkt_analytree *child;
struct npt_ethernet_hdr *hdr;
int ret;
ret = 0;
if (size < NPT_ETH_H)
goto err;
hdr = (struct npt_ethernet_hdr *)data;
proto = ntohs(hdr->ether_type);
ANALY_TREE_ADD_PROTO(err, atree, "ethernet protocol");
ANALY_TREE_ADD_FST_COMM(err, atree, child,
"Source MAC: %.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
hdr->ether_shost[0], hdr->ether_shost[1],
hdr->ether_shost[2], hdr->ether_shost[3],
hdr->ether_shost[4], hdr->ether_shost[5]
);
ANALY_TREE_ADD_COMM(err, child,
"Destination MAC: %.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
hdr->ether_dhost[0], hdr->ether_dhost[1],
hdr->ether_dhost[2], hdr->ether_dhost[3],
hdr->ether_dhost[4], hdr->ether_dhost[5]
);
ANALY_TREE_ADD_COMM(err, child, "type : 0x%x", proto);
ret = -1;
switch(proto) {
case ETHERTYPE_IP:
ret = ipv4_dump(summ, &(atree->next), data + NPT_ETH_H, size - NPT_ETH_H);
break;
case ETHERTYPE_ARP:
ret = arp_dump(summ, &(atree->next), data + NPT_ETH_H, size - NPT_ETH_H);
break;
}
if (ret < 0 || ((ret & UPDATE_DST) != UPDATE_DST)) {
if (hdr->ether_dhost[0] == 0xff && hdr->ether_dhost[1] == 0xff &&
hdr->ether_dhost[2] == 0xff && hdr->ether_dhost[3] == 0xff &&
hdr->ether_dhost[4] == 0xff && hdr->ether_dhost[5] == 0xff) {
snprintf(summ->dst, STR_DST_LEN, "Broadcast");
} else {
snprintf(summ->dst, STR_DST_LEN, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
hdr->ether_dhost[0], hdr->ether_dhost[1],
hdr->ether_dhost[2], hdr->ether_dhost[3],
hdr->ether_dhost[4], hdr->ether_dhost[5]);
}
}
if (ret < 0 || ((ret & UPDATE_SRC) != UPDATE_SRC))
snprintf(summ->src, STR_SRC_LEN, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
hdr->ether_shost[0], hdr->ether_shost[1],
hdr->ether_shost[2], hdr->ether_shost[3],
hdr->ether_shost[4], hdr->ether_shost[5]);
if (ret < 0 || ((ret & UPDATE_PRO) != UPDATE_PRO))
snprintf(summ->proto, STR_PROTO_LEN, "ETHERNET");
if (ret < 0 || ((ret & UPDATE_INFO) != UPDATE_INFO)) {
if (hdr->ether_dhost[0] == 0xff && hdr->ether_dhost[1] == 0xff &&
hdr->ether_dhost[2] == 0xff && hdr->ether_dhost[3] == 0xff &&
hdr->ether_dhost[4] == 0xff && hdr->ether_dhost[5] == 0xff) {
snprintf(summ->info, STR_INFO_LEN, "%s broadcast", summ->src);
} else {
snprintf(summ->info, STR_INFO_LEN, "%s -> %s",
summ->src, summ->dst);
}
}
ret = UPDATE_DST | UPDATE_SRC | UPDATE_INFO | UPDATE_PRO;
*analytree = atree;
return ret;
err:
free_analytree(atree);
*analytree = NULL;
return -1;
}
int pkt_analyse(struct pkt_summary **summary, struct pkt_analytree **analytree,
const unsigned char *data, unsigned int caplen, unsigned int len)
{
struct pkt_summary *summ;
struct pkt_analytree *atree;
int ret;
if ((summ = malloc(sizeof(*summ))) == NULL) {
fprintf(stderr, "malloc err %s\n", __FUNCTION__);
*analytree = NULL;
return -1;
}
bzero(summ, sizeof(*summ));
summ->len = len;
summ->caplen = caplen;
ret = ethernet_dump(summ, &atree, data, caplen);
if (ret > 0)
ret = 0;
*summary = summ;
*analytree = atree;
return ret;
}