-
Notifications
You must be signed in to change notification settings - Fork 0
/
worker.c
176 lines (144 loc) · 4.2 KB
/
worker.c
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
#ifndef REQUEST_C
#define REQUEST_C
#include <openssl/sha.h>
#include "api.h"
#include "lsp.pb-c.h"
void send_join_request(lsp_client* client, const char* dest, int port) {
char* join_msg = "j";
DEBUG("send_join_request: dest %s, port %d", dest, port);
client = lsp_client_create(dest, port);
if (client == NULL) {
DEBUG("send_join_request: can't create client");
}
lsp_client_write(client, join_msg, strlen(join_msg));
}
char* pass_increment(char* p, int len) {
char temp[len];
int i = len-1;
strcpy(temp,p);
// char *newstring = (char*)malloc(2);
char *newstring = (char*)malloc(len);
while(i>=0) {
if(temp[i]=='z') {
temp[i] = 'a';
i = i-1;
}
else {
temp[i]=temp[i]+1;
strcpy(newstring, temp);
return newstring;
}
}
}
int shaTest(char* input, int len, char* pass) {
int i = 0;
//note: must use unsigned char
unsigned char temp[SHA_DIGEST_LENGTH];
char buf[SHA_DIGEST_LENGTH*2];
memset(buf, 0x0, SHA_DIGEST_LENGTH*2);
memset(temp, 0x0, SHA_DIGEST_LENGTH);
SHA1((unsigned char *)input, len, temp);
for (i=0; i < SHA_DIGEST_LENGTH; i++) {
sprintf((char*)&(buf[i*2]), "%02x", temp[i]);
}
return strcmp(buf,pass)==0;
}
char* handle_crack_request(char* crack_req) {
char* hash, * lower, * upper;
char* delim = " ";
char* ret = NULL;
int i;
int len;
char* cur;
char* cur_prev;
DEBUG("handle_crack_request: %s", crack_req);
strtok(crack_req, delim);
hash = strtok(NULL, delim);
lower = strtok(NULL, delim);
upper = strtok(NULL, delim);
len = strlen(lower);
DEBUG("handle_crack_request: hash %s, lower %s, upper %s, len %d",
hash, lower, upper, len);
cur = (char*)malloc(len);
if (cur == NULL) {
DEBUG("handle_crack_request: malloc cur fail");
}
strcpy(cur, lower);
for(;;) {
DEBUG("handle_crack_request: sha1 on %s", cur);
if (shaTest(cur, len, hash)) {
ret = (char*)malloc(len + 2);
sprintf(ret, "f ", 2);
memcpy(ret + 2, cur, len);
DEBUG("handle_crack_request: found password %s", cur);
DEBUG("handle_crack_request: send %s", ret);
return ret;
}
DEBUG("handle_crack_request: compare %s %s", cur, upper);
if (strcmp(cur, upper) == 0) {
break;
}
cur_prev = cur;
cur = pass_increment(cur_prev, len);
free(cur_prev);
}
// "x": password not found
ret = (char*)malloc(2);
memset(ret, 0, 2);
sprintf(ret, "x", 1);
return ret;
}
void usage() {
PRINTF("usage: ./worker dest:port");
}
int main(int argc, char* argv[]) {
lsp_client* wk_client;
char* server_ip;
char* server_port_str;
int server_port;
int i;
char* hash;
char* lower;
char* upper;
char* delim = ":";
char buffer[1024];
char* ret;
int bytes_read;
char* join_msg = "j";
// 0. argv check
if (argc != 2) {
usage();
return -1;
}
// 1. join req
server_ip = strtok(argv[1], delim);
server_port_str = strtok(NULL, delim);
server_port = atoi(server_port_str);
// send_join_request(wk_client, server_ip, server_port);
DEBUG("send_join_request: dest %s, port %d", server_ip, server_port);
wk_client = lsp_client_create(server_ip, server_port);
if (wk_client == NULL) {
DEBUG("send_join_request: can't create client");
}
lsp_client_write(wk_client, join_msg, strlen(join_msg));
// 2. do work loop
for (;;) {
memset(buffer, 0, sizeof(buffer));
bytes_read = lsp_client_read(wk_client, buffer);
DEBUG("worker: recv %s", buffer);
if (bytes_read == 0)
continue;
if (bytes_read < 0)
break;
if (buffer[0] != 'c') {
DEBUG("worker: not crack req. recv %s", buffer);
continue;
}
DEBUG("work: begin to crack");
ret = handle_crack_request(buffer);
lsp_client_write(wk_client, ret, strlen(ret));
free(ret);
}
return 0;
}
#endif