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/*
* netsniff-ng - the packet sniffing beast
* Subject to the GPL, version 2.
*/
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/ethernet.h>
#include "trafgen_l2.h"
#include "trafgen_l3.h"
#include "trafgen_l4.h"
#include "trafgen_proto.h"
#include "trafgen_dump.h"
#define DUMP(fmt, ...) fprintf((ctx)->file, fmt, ##__VA_ARGS__)
#define PKT_START() DUMP("{\n")
#define PKT_END() DUMP("}\n")
#define HDR_START(h) DUMP(" %s(", h)
#define HDR_END(h) DUMP(" ),\n")
#define FIELD_START(fmt, ...) DUMP(fmt",\n", ##__VA_ARGS__)
#define FIELD_END(fmt, ...) DUMP(" "fmt"\n", ##__VA_ARGS__)
#define FIELD(fmt, ...) DUMP(" "fmt",\n", ##__VA_ARGS__)
struct dump_ctx {
FILE *file;
};
static int proto_dump_eth(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
uint8_t *mac;
HDR_START("eth");
mac = proto_hdr_field_get_bytes(hdr, ETH_DST_ADDR);
FIELD_START("da=%02x:%02x:%02x:%02x:%02x:%02x",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
mac = proto_hdr_field_get_bytes(hdr, ETH_SRC_ADDR);
FIELD("sa=%02x:%02x:%02x:%02x:%02x:%02x",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
FIELD_END("type=0x%x", proto_hdr_field_get_u16(hdr, ETH_TYPE));
HDR_END();
return 0;
}
static int proto_dump_vlan(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
HDR_START("vlan");
FIELD_START("id=%d", proto_hdr_field_get_u16(hdr, VLAN_VID));
FIELD("pcp=%d", proto_hdr_field_get_u16(hdr, VLAN_PCP));
FIELD("dei=%d", proto_hdr_field_get_u16(hdr, VLAN_DEI));
FIELD_END("tpid=0x%x", proto_hdr_field_get_u16(hdr, VLAN_TPID));
HDR_END();
return 0;
}
static int proto_dump_arp(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
char ip_str[INET_ADDRSTRLEN];
uint16_t oper;
uint8_t *mac;
uint32_t ip;
HDR_START("arp");
mac = proto_hdr_field_get_bytes(hdr, ARP_SHA);
FIELD_START("smac=%02x:%02x:%02x:%02x:%02x:%02x",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
ip = proto_hdr_field_get_be32(hdr, ARP_SPA);
inet_ntop(AF_INET, &ip, ip_str, sizeof(ip_str));
FIELD("sip=%s", ip_str);
mac = proto_hdr_field_get_bytes(hdr, ARP_THA);
FIELD("tmac=%02x:%02x:%02x:%02x:%02x:%02x",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
ip = proto_hdr_field_get_be32(hdr, ARP_TPA);
inet_ntop(AF_INET, &ip, ip_str, sizeof(ip_str));
FIELD("tip=%s", ip_str);
oper = proto_hdr_field_get_u16(hdr, ARP_OPER);
if (oper == ARPOP_REQUEST)
FIELD_END("op=request");
else if (oper == ARPOP_REPLY)
FIELD_END("op=reply");
else
FIELD_END("op=0x%x", oper);
HDR_END();
return 0;
}
static int proto_dump_ip4(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
char ip_sa_str[INET_ADDRSTRLEN];
char ip_da_str[INET_ADDRSTRLEN];
uint32_t ip;
ip = proto_hdr_field_get_be32(hdr, IP4_SADDR);
inet_ntop(AF_INET, &ip, ip_sa_str, sizeof(ip_sa_str));
ip = proto_hdr_field_get_be32(hdr, IP4_DADDR);
inet_ntop(AF_INET, &ip, ip_da_str, sizeof(ip_da_str));
HDR_START("ip4");
FIELD_START("ver=0x%x", proto_hdr_field_get_u8(hdr, IP4_VER));
FIELD("ihl=0x%x", proto_hdr_field_get_u8(hdr, IP4_IHL));
FIELD("dscp=0x%x", proto_hdr_field_get_u8(hdr, IP4_DSCP));
FIELD("ecn=0x%x", proto_hdr_field_get_u8(hdr, IP4_ECN));
FIELD("tos=0x%x", proto_hdr_field_get_u8(hdr, IP4_TOS));
FIELD("len=%d", proto_hdr_field_get_u16(hdr, IP4_LEN));
FIELD("id=0x%x", proto_hdr_field_get_u16(hdr, IP4_ID));
FIELD("flags=0x%x", proto_hdr_field_get_u16(hdr, IP4_FLAGS));
if (proto_hdr_field_get_u16(hdr, IP4_MF))
FIELD("mf");
if (proto_hdr_field_get_u16(hdr, IP4_DF))
FIELD("df");
FIELD("frag=0x%x", proto_hdr_field_get_u16(hdr, IP4_FRAG_OFFS));
FIELD("ttl=%d", proto_hdr_field_get_u8(hdr, IP4_TTL));
FIELD("proto=0x%x", proto_hdr_field_get_u8(hdr, IP4_PROTO));
FIELD("csum=0x%x", proto_hdr_field_get_u16(hdr, IP4_CSUM));
FIELD("sa=%s", ip_sa_str);
FIELD_END("da=%s", ip_da_str);
HDR_END();
return 0;
}
static int proto_dump_udp(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
HDR_START("udp");
FIELD_START("dp=%d", proto_hdr_field_get_u16(hdr, UDP_SPORT));
FIELD("sp=%d", proto_hdr_field_get_u16(hdr, UDP_DPORT));
FIELD("len=%d", proto_hdr_field_get_u16(hdr, UDP_LEN));
FIELD_END("csum=0x%x", proto_hdr_field_get_u16(hdr, UDP_CSUM));
HDR_END();
return 0;
}
static int proto_dump_tcp(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
HDR_START("tcp");
FIELD_START("dp=%d", proto_hdr_field_get_u16(hdr, TCP_SPORT));
FIELD("sp=%d", proto_hdr_field_get_u16(hdr, TCP_DPORT));
FIELD("seq=0x%x", proto_hdr_field_get_u32(hdr, TCP_SEQ));
FIELD("ackseq=0x%x", proto_hdr_field_get_u32(hdr, TCP_ACK_SEQ));
FIELD("hlen=%d", proto_hdr_field_get_u16(hdr, TCP_DOFF));
if (proto_hdr_field_get_u16(hdr, TCP_CWR))
FIELD("cwr");
if (proto_hdr_field_get_u16(hdr, TCP_ECE))
FIELD("ecn");
if (proto_hdr_field_get_u16(hdr, TCP_URG))
FIELD("urg");
if (proto_hdr_field_get_u16(hdr, TCP_ACK))
FIELD("ack");
if (proto_hdr_field_get_u16(hdr, TCP_PSH))
FIELD("psh");
if (proto_hdr_field_get_u16(hdr, TCP_RST))
FIELD("rst");
if (proto_hdr_field_get_u16(hdr, TCP_SYN))
FIELD("syn");
if (proto_hdr_field_get_u16(hdr, TCP_FIN))
FIELD("fin");
FIELD("win=%d", proto_hdr_field_get_u16(hdr, TCP_WINDOW));
FIELD("csum=0x%x", proto_hdr_field_get_u16(hdr, TCP_CSUM));
FIELD_END("urgptr=0x%x", proto_hdr_field_get_u16(hdr, TCP_URG_PTR));
HDR_END();
return 0;
}
static int proto_dump_hdr(struct dump_ctx *ctx, struct proto_hdr *hdr)
{
switch (hdr->ops->id) {
case PROTO_ETH:
return proto_dump_eth(ctx, hdr);
case PROTO_VLAN:
return proto_dump_vlan(ctx, hdr);
case PROTO_ARP:
return proto_dump_arp(ctx, hdr);
case PROTO_IP4:
return proto_dump_ip4(ctx, hdr);
case PROTO_UDP:
return proto_dump_udp(ctx, hdr);
case PROTO_TCP:
return proto_dump_tcp(ctx, hdr);
default:
return -1;
}
}
int packet_dump_fd(struct packet *pkt, int fd)
{
struct proto_hdr *hdr;
enum proto_id pid;
struct dump_ctx _ctx;
struct dump_ctx *ctx = &_ctx;
size_t dump_len = 0;
uint32_t i;
_ctx.file = fdopen(fd, "w");
if (!_ctx.file)
return -1;
/* handle case if there is already proto headers */
if (pkt->headers_count == 0) {
hdr = proto_packet_apply(PROTO_ETH, pkt);
while ((pid = proto_hdr_get_next_proto(hdr)) != __PROTO_MAX) {
if (hdr->pkt_offset + hdr->len >= pkt->len)
break;
hdr = proto_packet_apply(pid, pkt);
}
}
PKT_START();
for (i = 0; i < pkt->headers_count; i++) {
hdr = pkt->headers[i];
if (proto_dump_hdr(ctx, hdr))
break;
dump_len += hdr->len;
}
/* print rest as a bytes */
if (dump_len < pkt->len) {
int j = 1;
DUMP(" ");
for (i = dump_len; i < pkt->len; ++i, ++j) {
if (j % 15 == 0)
DUMP("\n ");
DUMP("0x%02x,", pkt->payload[i]);
}
DUMP("\n");
}
PKT_END();
fflush(ctx->file);
return 0;
}
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