-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathsampleRawPacket.c
More file actions
204 lines (143 loc) · 4.97 KB
/
Copy pathsampleRawPacket.c
File metadata and controls
204 lines (143 loc) · 4.97 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <unistd.h>
typedef struct{
uint8_t version_ihl;
uint8_t dscp_ecn;
uint16_t total_length;
uint16_t identification;
uint16_t flags_fragment_offset;
uint8_t ttl;
uint8_t protocol;
uint16_t checksum;
uint32_t source_ip;
uint32_t dest_ip;
} ipv4header;
typedef struct{
uint16_t source_port;
uint16_t dest_port;
uint16_t length;
uint16_t checksum;
} udpheader;
typedef struct{
uint8_t type;
uint8_t code;
uint16_t checksum;
uint32_t rest;
} icmp_header;
typedef struct{
ipv4header ip;
udpheader udp;
uint8_t data[32];
} measurement_packet;
typedef struct{
ipv4header ip;
udpheader udp;
uint8_t data[472];
} load_packet;
typedef struct{
measurement_packet beg[30];
load_packet mid[60];
measurement_packet end[30];
} rpt;
void calculate_checksum(uint16_t* ptr, int num_bytes, uint16_t* checksum_field);
void calculate_checksum(uint16_t* ptr, int num_bytes, uint16_t* checksum_field){
uint32_t sum = 0;
while(num_bytes > 1){
sum += *(ptr++);
num_bytes-=2;
}
if(num_bytes > 0){
sum+= *((uint8_t*) ptr);
}
while(sum>>16){
sum = (sum & 0xffff) + (sum>>16);
}
*checksum_field = ~sum;
}
int main(){
int s = socket(PF_INET, SOCK_RAW, IPPROTO_RAW);
if(s == -1){
printf("Error on creating socket.\n");
return 0;
}
struct sockaddr_in endpoint;
endpoint.sin_family = AF_INET;
endpoint.sin_port = htons(0);
endpoint.sin_addr.s_addr = htonl(0x08080808);
memset(endpoint.sin_zero, 0, sizeof(unsigned char)*8);
int c = connect(s, (struct sockaddr*) &endpoint, sizeof(endpoint));
if(c == -1){
printf("Error on connecting.\n");
return 0;
}
rpt sample;
uint16_t id = 0;
for(int i = 0; i<30; i++){
sample.beg[i].ip.version_ihl = 0x45;
sample.beg[i].ip.dscp_ecn = 0x00;
sample.beg[i].ip.total_length = htons((uint16_t) sizeof(measurement_packet));
sample.beg[i].ip.identification = htons(id++);
sample.beg[i].ip.flags_fragment_offset = htons(0x0000);
sample.beg[i].ip.ttl = (uint8_t) i+1;
sample.beg[i].ip.protocol = 0x11;
sample.beg[i].ip.source_ip = 0;
sample.beg[i].ip.dest_ip = htonl(0x08080808);
sample.beg[i].ip.checksum = 0;
calculate_checksum((uint16_t*) &(sample.beg[i].ip), 20, &(sample.beg[i].ip.checksum));
sample.beg[i].udp.source_port = htons(6969);
sample.beg[i].udp.dest_port = 0;
sample.beg[i].udp.length = htons((uint16_t) (sizeof(measurement_packet) - sizeof(ipv4header)));
sample.beg[i].udp.checksum = 0;
}
for(int i = 0; i<60; i++){
sample.mid[i].ip.version_ihl = 0x45;
sample.mid[i].ip.dscp_ecn = 0x00;
sample.mid[i].ip.total_length = htons((uint16_t) sizeof(load_packet));
sample.mid[i].ip.identification = htons(id++);
sample.mid[i].ip.flags_fragment_offset = htons(0x0000);
sample.mid[i].ip.ttl = 255;
sample.mid[i].ip.protocol = 0x11;
sample.mid[i].ip.source_ip = 0;
sample.mid[i].ip.dest_ip = htonl(0x08080808);
sample.mid[i].ip.checksum = 0;
calculate_checksum((uint16_t*) &(sample.mid[i].ip), 20, &(sample.mid[i].ip.checksum));
sample.mid[i].udp.source_port = htons(6969);
sample.mid[i].udp.dest_port = 0;
sample.mid[i].udp.length = htons((uint16_t) (sizeof(load_packet) - sizeof(ipv4header)));
sample.mid[i].udp.checksum = 0;
}
for(int i = 30; i>0; i--){
sample.end[30-i].ip.version_ihl = 0x45;
sample.end[30-i].ip.dscp_ecn = 0x00;
sample.end[30-i].ip.total_length = htons((uint16_t) sizeof(measurement_packet));
sample.end[30-i].ip.identification = htons(id++);
sample.end[30-i].ip.flags_fragment_offset = htons(0x0000);
sample.end[30-i].ip.ttl = (uint8_t) i;
sample.end[30-i].ip.protocol = 0x11;
sample.end[30-i].ip.source_ip = 0;
sample.end[30-i].ip.dest_ip = htonl(0x08080808);
sample.end[30-i].ip.checksum = 0;
calculate_checksum((uint16_t*) &(sample.end[30-i].ip), 20, &(sample.end[30-i].ip.checksum));
sample.end[30-i].udp.source_port = htons(6969);
sample.end[30-i].udp.dest_port = 0;
sample.end[30-i].udp.length = htons((uint16_t) (sizeof(measurement_packet) - sizeof(ipv4header)));
sample.end[30-i].udp.checksum = 0;
}
int ss = send(s, &sample.beg[0], sizeof(sample.beg[0]), 0);
ss = send(s, &sample.beg[1], sizeof(sample.beg[1]), 0);
if(ss == -1){
printf("Error on sending.\n");
perror("");
return 0;
}
return 0;
}