New question #249394 on rohc:
https://answers.launchpad.net/rohc/+question/249394
Hi, I were using the following code for compressing UDP RAW socket packets
using ROHC library, but I got the error as the packet does not matches the
fromat..
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<netinet/ip_icmp.h>
#include<netinet/udp.h>
#include<netinet/tcp.h>
#include<netinet/ip.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<rohc.h>
#include<rohc_comp.h>
#include<rohc_decomp.h>
#define BUFFER_SIZE 2048
void ProcessPacket(unsigned char* , int);
void print_ip_header(unsigned char* , int);
void print_tcp_packet(unsigned char* , int);
int print_udp_packet(unsigned char * , int);
void print_icmp_packet(unsigned char* , int);
void PrintData (unsigned char* , int);
static int gen_random_num(const struct rohc_comp *const comp,void *const
user_context);
int sock_raw;
FILE *logfile;
int tcp=0,udp=0,icmp=0,others=0,igmp=0,total=0,i,j;
struct sockaddr_in source,dest;
int main()
{
int saddr_size , data_size;
struct sockaddr saddr;
struct in_addr in;
unsigned char *buffer = (unsigned char *)malloc(65536);
logfile=fopen("log.txt","w");
if(logfile==NULL) printf("Unable to create file.");
printf("Starting...\n");
//Create a raw socket that shall sniff
sock_raw = socket(AF_INET , SOCK_RAW , IPPROTO_UDP);
if(sock_raw < 0)
{
printf("Socket Error\n");
return 1;
}
while(1)
{
saddr_size = sizeof saddr;
data_size = recvfrom(sock_raw , buffer , 65536 , 0 , &saddr ,
&saddr_size);
if(data_size <0 )
{
printf("Recvfrom error , failed to get packets\n");
return 1;
}
ProcessPacket(buffer , data_size);
}
close(sock_raw);
printf("Finished");
return 0;
}
void ProcessPacket(unsigned char* buffer, int size)
{
//Get the IP Header part of this packet
struct iphdr *iph = (struct iphdr*)buffer;
++total;
switch (iph->protocol)
{
case 1:
++icmp;
break;
case 2:
++igmp;
break;
case 6:
++tcp;
print_tcp_packet(buffer , size);
break;
case 17:
++udp;
print_udp_packet(buffer , size);
break;
default:
++others;
break;
}
printf("TCP : %d UDP : %d ICMP : %d IGMP : %d Others : %d Total :
%d\r",tcp,udp,icmp,igmp,others,total);
}
void print_ip_header(unsigned char* Buffer, int Size)
{
unsigned short iphdrlen;
struct iphdr *iph = (struct iphdr *)Buffer;
iphdrlen =iph->ihl*4;
iph->protocol = (unsigned int)17;
memset(&source, 0, sizeof(source));
source.sin_addr.s_addr = iph->saddr;
memset(&dest, 0, sizeof(dest));
dest.sin_addr.s_addr = iph->daddr;
fprintf(logfile,"\n");
fprintf(logfile,"IP Header\n");
fprintf(logfile," |-IP Version : %d\n",(unsigned int)iph->version);
fprintf(logfile," |-IP Header Length : %d DWORDS or %d
Bytes\n",(unsigned int)iph->ihl,((unsigned int)(iph->ihl))*4);
fprintf(logfile," |-Type Of Service : %d\n",(unsigned int)iph->tos);
fprintf(logfile," |-IP Total Length : %d Bytes(Size of
Packet)\n",ntohs(iph->tot_len));
fprintf(logfile," |-Identification : %d\n",ntohs(iph->id));
fprintf(logfile," |-TTL : %d\n",(unsigned int)iph->ttl);
fprintf(logfile," |-Protocol : %d\n",(unsigned int)iph->protocol);
fprintf(logfile," |-Checksum : %d\n",ntohs(iph->check));
fprintf(logfile," |-Source IP : %s\n",inet_ntoa(source.sin_addr));
fprintf(logfile," |-Destination IP : %s\n",inet_ntoa(dest.sin_addr));
}
void print_tcp_packet(unsigned char* Buffer, int Size)
{
unsigned short iphdrlen;
struct iphdr *iph = (struct iphdr *)Buffer;
iphdrlen = iph->ihl*4;
iph->protocol = 17;
struct tcphdr *tcph=(struct tcphdr*)(Buffer + iphdrlen);
fprintf(logfile,"\n\n***********************TCP
Packet*************************\n");
print_ip_header(Buffer,Size);
fprintf(logfile,"\n");
fprintf(logfile,"TCP Header\n");
fprintf(logfile," |-Source Port : %u\n",ntohs(tcph->source));
fprintf(logfile," |-Destination Port : %u\n",ntohs(tcph->dest));
fprintf(logfile," |-Sequence Number : %u\n",ntohl(tcph->seq));
fprintf(logfile," |-Acknowledge Number : %u\n",ntohl(tcph->ack_seq));
fprintf(logfile," |-Header Length : %d DWORDS or %d BYTES\n"
,(unsigned int)tcph->doff,(unsigned int)tcph->doff*4);
fprintf(logfile," |-Urgent Flag : %d\n",(unsigned int)tcph->urg);
fprintf(logfile," |-Acknowledgement Flag : %d\n",(unsigned int)tcph->ack);
fprintf(logfile," |-Push Flag : %d\n",(unsigned int)tcph->psh);
fprintf(logfile," |-Reset Flag : %d\n",(unsigned int)tcph->rst);
fprintf(logfile," |-Synchronise Flag : %d\n",(unsigned int)tcph->syn);
fprintf(logfile," |-Finish Flag : %d\n",(unsigned int)tcph->fin);
fprintf(logfile," |-Window : %d\n",ntohs(tcph->window));
fprintf(logfile," |-Checksum : %d\n",ntohs(tcph->check));
fprintf(logfile," |-Urgent Pointer : %d\n",tcph->urg_ptr);
fprintf(logfile,"\n");
fprintf(logfile," DATA Dump
");
fprintf(logfile,"\n");
fprintf(logfile,"IP Header\n");
PrintData(Buffer,iphdrlen);
fprintf(logfile,"TCP Header\n");
PrintData(Buffer+iphdrlen,tcph->doff*4);
fprintf(logfile,"Data Payload\n");
PrintData(Buffer + iphdrlen + tcph->doff*4 , (Size -
tcph->doff*4-iph->ihl*4) );
fprintf(logfile,"\n###########################################################");
}
int print_udp_packet(unsigned char *Buffer , int Size)
{
unsigned short iphdrlen;
unsigned int ip_packet_len, rohc_packet_len;
unsigned char rohc_packet[BUFFER_SIZE], op_packet[BUFFER_SIZE];
int ret;
struct iphdr *iph = (struct iphdr *)Buffer;
iphdrlen = iph->ihl*4;
struct udphdr *udph = (struct udphdr*)(Buffer + iphdrlen);
struct rohc_comp *compressor;
struct rohc_decomp *decompressor;
fprintf(logfile,"\n\n***********************UDP
Packet*************************\n");
print_ip_header(Buffer,Size);
fprintf(logfile,"\nUDP Header\n");
fprintf(logfile," |-Source Port : %d\n" , ntohs(udph->source));
fprintf(logfile," |-Destination Port : %d\n" , ntohs(udph->dest));
fprintf(logfile," |-UDP Length : %d\n" , ntohs(udph->len));
fprintf(logfile," |-UDP Checksum : %d\n" , ntohs(udph->check));
fprintf(logfile,"\n");
fprintf(logfile,"IP Header\n");
PrintData(Buffer , iphdrlen);
fprintf(logfile,"UDP Header\n");
PrintData(Buffer+iphdrlen , sizeof udph);
fprintf(logfile,"Data Payload\n");
PrintData(Buffer + iphdrlen + sizeof udph ,( Size - sizeof udph - iph->ihl
* 4 ));
fprintf(logfile,"\n###########################################################");
printf("\n Creating ROHC compressor......\n\n");
compressor = rohc_alloc_compressor(15,0,0,0);
if(compressor == NULL)
{
fprintf(stderr,"\n Failed creating compressor!!\n");
rohc_free_compressor(compressor);
}
if(!rohc_comp_set_random_cb(compressor, gen_random_num,
NULL))
{
fprintf(stderr, "\n Failed to
set the compressor callback random numbers!!\n");
rohc_free_compressor(compressor);
}
rohc_activate_profile(compressor, ROHC_PROFILE_IP);
rohc_activate_profile(compressor, ROHC_PROFILE_UDP);
printf("\n Compressing the UDP/IP packet...\n\n");
ip_packet_len = Size - sizeof udph - iph->ihl * 4;
ret=rohc_compress2(compressor,Buffer,ip_packet_len,rohc_packet,
BUFFER_SIZE, &rohc_packet_len);
if(ret!=ROHC_OK)
{
fprintf(stderr, "Compression of IP packet failed\n");
rohc_free_compressor(compressor);
return 1;
}
printf("\n ROHC packet after compression:\n");
for(i = 0; i < ((unsigned int) rohc_packet_len); i++)
{
printf("0x%02x ", rohc_packet[i]);
if(i != 0 && ((i + 1) % 8) == 0)
{
printf("\n");
}
}
if(i != 0 && (i % 8) != 0)
{
printf("\n");
}
printf("\n Creating ROHC Decompressor.....");
decompressor=rohc_alloc_decompressor(compressor);
if(decompressor == NULL)
{
fprintf(stderr,"\n Failed creating decompressor!!\n");
rohc_free_decompressor(decompressor);
}
if(!rohc_decomp_set_traces_cb(decompressor, NULL))
{
fprintf(stderr,"\n Failed to set callback traces for
decompressor!!");
rohc_free_decompressor(decompressor);
}
printf("\n Decompressing the UDP/IP packet....\n");
ret=rohc_decompress(decompressor,rohc_packet,rohc_packet_len,op_packet,BUFFER_SIZE);
if(ret <= 0)
{
fprintf(stderr, "Decompression failed\n");
rohc_free_decompressor(decompressor);
}
printf("\n IP packet after Decompression:\n\n");
for(i = 0; i < ((unsigned int) ret); i++)
{
printf("0x%02x ", op_packet[i]);
if(i != 0 && ((i + 1) % 8) == 0)
{
printf("\n");
}
}
if(i != 0 && (i % 8) != 0)
{
printf("\n");
}
printf("\n Destroy the Compressor and Decompressor");
rohc_free_compressor(compressor);
rohc_free_decompressor(decompressor);
return 0;
}
static int gen_random_num(const struct rohc_comp *const comp,void *const
user_context)
{
return rand();
}
void print_icmp_packet(unsigned char* Buffer , int Size)
{
unsigned short iphdrlen;
struct iphdr *iph = (struct iphdr *)Buffer;
iphdrlen = iph->ihl*4;
struct icmphdr *icmph = (struct icmphdr *)(Buffer + iphdrlen);
fprintf(logfile,"\n\n***********************ICMP
Packet*************************\n");
print_ip_header(Buffer , Size);
fprintf(logfile,"\n");
fprintf(logfile,"ICMP Header\n");
fprintf(logfile," |-Type : %d",(unsigned int)(icmph->type));
if((unsigned int)(icmph->type) == 11)
fprintf(logfile," (TTL Expired)\n");
else if((unsigned int)(icmph->type) == ICMP_ECHOREPLY)
fprintf(logfile," (ICMP Echo Reply)\n");
fprintf(logfile," |-Code : %d\n",(unsigned int)(icmph->code));
fprintf(logfile," |-Checksum : %d\n",ntohs(icmph->checksum));
fprintf(logfile,"\n");
fprintf(logfile,"IP Header\n");
PrintData(Buffer,iphdrlen);
fprintf(logfile,"UDP Header\n");
PrintData(Buffer + iphdrlen , sizeof icmph);
fprintf(logfile,"Data Payload\n");
PrintData(Buffer + iphdrlen + sizeof icmph , (Size - sizeof icmph -
iph->ihl * 4));
fprintf(logfile,"\n###########################################################");
}
void PrintData (unsigned char* data , int Size)
{
for(i=0 ; i < Size ; i++)
{
if( i!=0 && i%16==0)
{
fprintf(logfile," ");
for(j=i-16 ; j<i ; j++)
{
if(data[j]>=32 && data[j]<=128)
fprintf(logfile,"%c",(unsigned char)data[j]);
else fprintf(logfile,".");
}
fprintf(logfile,"\n");
}
if(i%16==0) fprintf(logfile," ");
fprintf(logfile," %02X",(unsigned int)data[i]);
if( i==Size-1)
{
for(j=0;j<15-i%16;j++) fprintf(logfile," ");
fprintf(logfile," ");
for(j=i-i%16 ; j<=i ; j++)
{
if(data[j]>=32 && data[j]<=128) fprintf(logfile,"%c",(unsigned
char)data[j]);
else fprintf(logfile,".");
}
fprintf(logfile,"\n");
}
}
}
Creating ROHC compressor......
please define a callback for compressor traces
[rohc_comp.c:1102 rohc_comp_set_wlsb_window_width()] width of W-LSB sliding
window set to 4
[rohc_comp.c:1159 rohc_comp_set_periodic_refreshes()] IR timeout for context
periodic refreshes set to 1700
[rohc_comp.c:1161 rohc_comp_set_periodic_refreshes()] FO timeout for context
periodic refreshes set to 700
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 1234 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 36780 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 33238 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 5020 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 5002 added to the UDP port
list for RTP traffic
[rohc_comp.c:2955 c_create_contexts()] create enough room for 16 contexts
(MAX_CID = 15)
Compressing the UDP/IP packet...
[rohc_traces_internal.c:68 rohc_dump_packet()] uncompressed data, max 100 bytes
(100 bytes):
[rohc_traces_internal.c:77 rohc_dump_packet()] 45 00 00 84 07 7a 00 00 80 11
17 91 0a b0 10 af
[rohc_traces_internal.c:77 rohc_dump_packet()] ff ff ff ff 44 5c 44 5c 00 70
80 4b 7b 22 68 6f
[rohc_traces_internal.c:77 rohc_dump_packet()] 73 74 5f 69 6e 74 22 3a 20 31
34 32 30 31 33 32
[rohc_traces_internal.c:77 rohc_dump_packet()] 32 37 30 2c 20 22 76 65 72 73
69 6f 6e 22 3a 20
[rohc_traces_internal.c:77 rohc_dump_packet()] 5b 31 2c 20 38 5d 2c 20 22 64
69 73 70 6c 61 79
[rohc_traces_internal.c:77 rohc_dump_packet()] 6e 61 6d 65 22 3a 20 22 22 2c
20 22 70 6f 72 74
[rohc_traces_internal.c:97 rohc_dump_packet()] 22 3a 20 31
[rohc_comp.c:609 rohc_compress2()] size of uncompressed packet = 108 bytes
[rohc_comp.c:640 rohc_compress2()] try to find the best profile for packet with
transport protocol 0
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'RTP /
Compressor' (0x0001)
[rohc_comp.c:2707 c_get_profile_from_packet()] skip profile 'UDP / Compressor'
(0x0002) because it does not match packet
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'UDP-Lite
/ Compressor' (0x0008)
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'ESP /
Compressor' (0x0003)
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'IP /
Compressor' (0x0004)
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile
'Uncompressed / Compressor' (0x0000)
[rohc_comp.c:645 rohc_compress2()] no profile found for packet, giving up
Compression of IP packet failed
[rohc_comp.c:328 rohc_free_compressor()] free compressor
TCP : 0 UDP : 1 ICMP : 0 IGMP : 0 Others : 0 Total : 1
Creating ROHC compressor......
[rohc_comp.c:1102 rohc_comp_set_wlsb_window_width()] width of W-LSB sliding
window set to 4
[rohc_comp.c:1159 rohc_comp_set_periodic_refreshes()] IR timeout for context
periodic refreshes set to 1700
[rohc_comp.c:1161 rohc_comp_set_periodic_refreshes()] FO timeout for context
periodic refreshes set to 700
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 1234 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 36780 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 33238 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 5020 added to the UDP port
list for RTP traffic
[rohc_comp.c:1585 rohc_comp_add_rtp_port()] port 5002 added to the UDP port
list for RTP traffic
[rohc_comp.c:2955 c_create_contexts()] create enough room for 16 contexts
(MAX_CID = 15)
Compressing the UDP/IP packet...
[rohc_traces_internal.c:68 rohc_dump_packet()] uncompressed data, max 100 bytes
(100 bytes):
[rohc_traces_internal.c:77 rohc_dump_packet()] 45 00 00 84 07 7b 00 00 80 11
fa e0 0a b0 10 af
[rohc_traces_internal.c:77 rohc_dump_packet()] 0a b0 11 ff 44 5c 44 5c 00 70
63 9c 7b 22 68 6f
[rohc_traces_internal.c:77 rohc_dump_packet()] 73 74 5f 69 6e 74 22 3a 20 31
34 32 30 31 33 32
[rohc_traces_internal.c:77 rohc_dump_packet()] 32 37 30 2c 20 22 76 65 72 73
69 6f 6e 22 3a 20
[rohc_traces_internal.c:77 rohc_dump_packet()] 5b 31 2c 20 38 5d 2c 20 22 64
69 73 70 6c 61 79
[rohc_traces_internal.c:77 rohc_dump_packet()] 6e 61 6d 65 22 3a 20 22 22 2c
20 22 70 6f 72 74
[rohc_traces_internal.c:97 rohc_dump_packet()] 22 3a 20 31
[rohc_comp.c:609 rohc_compress2()] size of uncompressed packet = 108 bytes
[rohc_comp.c:640 rohc_compress2()] try to find the best profile for packet with
transport protocol 0
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'RTP /
Compressor' (0x0001)
[rohc_comp.c:2707 c_get_profile_from_packet()] skip profile 'UDP / Compressor'
(0x0002) because it does not match packet
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'UDP-Lite
/ Compressor' (0x0008)
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'ESP /
Compressor' (0x0003)
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile 'IP /
Compressor' (0x0004)
[rohc_comp.c:2692 c_get_profile_from_packet()] skip disabled profile
'Uncompressed / Compressor' (0x0000)
[rohc_comp.c:645 rohc_compress2()] no profile found for packet, giving up
Compression of IP packet failed
[rohc_comp.c:328 rohc_free_compressor()] free compressor
TCP : 0 UDP : 2 ICMP : 0 IGMP : 0 Others : 0 Total : 2
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