-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathproxy_server_with_cache.c
494 lines (415 loc) · 12.7 KB
/
proxy_server_with_cache.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
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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
#include "proxy_parse.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <sys/wait.h>
#include <errno.h>
#include <pthread.h>
#include <semaphore.h>
#include <time.h>
#define MAX_BYTES 4096
#define MAX_CLIENTS 400
#define MAX_SIZE 200*(1<<20)
#define MAX_ELEMENT_SIZE 10*(1<<20)
typedef struct ParsedRequest ParsedRequest;
typedef struct cache_element cache_element;
struct cache_element{
char* data;
int len;
char* url;
time_t lru_time_track;
cache_element* next;
};
cache_element* find(char* url);
int add_cache_element(char* data,int size,char* url);
void remove_cache_element();
int port_number = 8080;
int proxy_socketId;
pthread_t tid[MAX_CLIENTS];
sem_t seamaphore;
pthread_mutex_t lock;
cache_element* head;
int cache_size;
int sendErrorMessage(int socket, int status_code)
{
char str[1024];
char currentTime[50];
time_t now = time(0);
struct tm data = *gmtime(&now);
strftime(currentTime,sizeof(currentTime),"%a, %d %b %Y %H:%M:%S %Z", &data);
switch(status_code)
{
case 400: snprintf(str, sizeof(str), "HTTP/1.1 400 Bad Request\r\nContent-Length: 95\r\nConnection: keep-alive\r\nContent-Type: text/html\r\nDate: %s\r\nServer: VaibhavN/14785\r\n\r\n<HTML><HEAD><TITLE>400 Bad Request</TITLE></HEAD>\n<BODY><H1>400 Bad Rqeuest</H1>\n</BODY></HTML>", currentTime);
printf("400 Bad Request\n");
send(socket, str, strlen(str), 0);
break;
case 403: snprintf(str, sizeof(str), "HTTP/1.1 403 Forbidden\r\nContent-Length: 112\r\nContent-Type: text/html\r\nConnection: keep-alive\r\nDate: %s\r\nServer: VaibhavN/14785\r\n\r\n<HTML><HEAD><TITLE>403 Forbidden</TITLE></HEAD>\n<BODY><H1>403 Forbidden</H1><br>Permission Denied\n</BODY></HTML>", currentTime);
printf("403 Forbidden\n");
send(socket, str, strlen(str), 0);
break;
case 404: snprintf(str, sizeof(str), "HTTP/1.1 404 Not Found\r\nContent-Length: 91\r\nContent-Type: text/html\r\nConnection: keep-alive\r\nDate: %s\r\nServer: VaibhavN/14785\r\n\r\n<HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD>\n<BODY><H1>404 Not Found</H1>\n</BODY></HTML>", currentTime);
printf("404 Not Found\n");
send(socket, str, strlen(str), 0);
break;
case 500: snprintf(str, sizeof(str), "HTTP/1.1 500 Internal Server Error\r\nContent-Length: 115\r\nConnection: keep-alive\r\nContent-Type: text/html\r\nDate: %s\r\nServer: VaibhavN/14785\r\n\r\n<HTML><HEAD><TITLE>500 Internal Server Error</TITLE></HEAD>\n<BODY><H1>500 Internal Server Error</H1>\n</BODY></HTML>", currentTime);
send(socket, str, strlen(str), 0);
break;
case 501: snprintf(str, sizeof(str), "HTTP/1.1 501 Not Implemented\r\nContent-Length: 103\r\nConnection: keep-alive\r\nContent-Type: text/html\r\nDate: %s\r\nServer: VaibhavN/14785\r\n\r\n<HTML><HEAD><TITLE>404 Not Implemented</TITLE></HEAD>\n<BODY><H1>501 Not Implemented</H1>\n</BODY></HTML>", currentTime);
printf("501 Not Implemented\n");
send(socket, str, strlen(str), 0);
break;
case 505: snprintf(str, sizeof(str), "HTTP/1.1 505 HTTP Version Not Supported\r\nContent-Length: 125\r\nConnection: keep-alive\r\nContent-Type: text/html\r\nDate: %s\r\nServer: VaibhavN/14785\r\n\r\n<HTML><HEAD><TITLE>505 HTTP Version Not Supported</TITLE></HEAD>\n<BODY><H1>505 HTTP Version Not Supported</H1>\n</BODY></HTML>", currentTime);
printf("505 HTTP Version Not Supported\n");
send(socket, str, strlen(str), 0);
break;
default: return -1;
}
return 1;
}
int connectRemoteServer(char* host_addr, int port_num)
{
int remoteSocket = socket(AF_INET, SOCK_STREAM, 0);
if( remoteSocket < 0)
{
printf("Error in Creating Socket.\n");
return -1;
}
struct hostent *host = gethostbyname(host_addr);
if(host == NULL)
{
fprintf(stderr, "No such host exists.\n");
return -1;
}
struct sockaddr_in server_addr;
bzero((char*)&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port_num);
bcopy((char *)host->h_addr,(char *)&server_addr.sin_addr.s_addr,host->h_length);
if( connect(remoteSocket, (struct sockaddr*)&server_addr, (socklen_t)sizeof(server_addr)) < 0 )
{
fprintf(stderr, "Error in connecting !\n");
return -1;
}
return remoteSocket;
}
int handle_request(int clientSocket, ParsedRequest *request, char *tempReq)
{
char *buf = (char*)malloc(sizeof(char)*MAX_BYTES);
strcpy(buf, "GET ");
strcat(buf, request->path);
strcat(buf, " ");
strcat(buf, request->version);
strcat(buf, "\r\n");
size_t len = strlen(buf);
if (ParsedHeader_set(request, "Connection", "close") < 0){
printf("set header key not work\n");
}
if(ParsedHeader_get(request, "Host") == NULL)
{
if(ParsedHeader_set(request, "Host", request->host) < 0){
printf("Set \"Host\" header key not working\n");
}
}
if (ParsedRequest_unparse_headers(request, buf + len, (size_t)MAX_BYTES - len) < 0) {
printf("unparse failed\n");
}
int server_port = 80;
if(request->port != NULL)
server_port = atoi(request->port);
int remoteSocketID = connectRemoteServer(request->host, server_port);
if(remoteSocketID < 0)
return -1;
int bytes_send = send(remoteSocketID, buf, strlen(buf), 0);
bzero(buf, MAX_BYTES);
bytes_send = recv(remoteSocketID, buf, MAX_BYTES-1, 0);
char *temp_buffer = (char*)malloc(sizeof(char)*MAX_BYTES);
int temp_buffer_size = MAX_BYTES;
int temp_buffer_index = 0;
while(bytes_send > 0)
{
bytes_send = send(clientSocket, buf, bytes_send, 0);
for(int i=0;i<bytes_send/sizeof(char);i++){
temp_buffer[temp_buffer_index] = buf[i];
temp_buffer_index++;
}
temp_buffer_size += MAX_BYTES;
temp_buffer=(char*)realloc(temp_buffer,temp_buffer_size);
if(bytes_send < 0)
{
perror("Error in sending data to client socket.\n");
break;
}
bzero(buf, MAX_BYTES);
bytes_send = recv(remoteSocketID, buf, MAX_BYTES-1, 0);
}
temp_buffer[temp_buffer_index]='\0';
free(buf);
add_cache_element(temp_buffer, strlen(temp_buffer), tempReq);
printf("Done\n");
free(temp_buffer);
close(remoteSocketID);
return 0;
}
int checkHTTPversion(char *msg)
{
int version = -1;
if(strncmp(msg, "HTTP/1.1", 8) == 0)
{
version = 1;
}
else if(strncmp(msg, "HTTP/1.0", 8) == 0)
{
version = 1;
}
else
version = -1;
return version;
}
void* thread_fn(void* socketNew)
{
sem_wait(&seamaphore);
int p;
sem_getvalue(&seamaphore,&p);
printf("semaphore value:%d\n",p);
int* t= (int*)(socketNew);
int socket=*t;
int bytes_send_client,len;
char *buffer = (char*)calloc(MAX_BYTES,sizeof(char));
bzero(buffer, MAX_BYTES);
bytes_send_client = recv(socket, buffer, MAX_BYTES, 0);
while(bytes_send_client > 0)
{
len = strlen(buffer);
if(strstr(buffer, "\r\n\r\n") == NULL)
{
bytes_send_client = recv(socket, buffer + len, MAX_BYTES - len, 0);
}
else{
break;
}
}
char *tempReq = (char*)malloc(strlen(buffer)*sizeof(char)+1);
for (int i = 0; i < strlen(buffer); i++)
{
tempReq[i] = buffer[i];
}
struct cache_element* temp = find(tempReq);
if( temp != NULL){
int size=temp->len/sizeof(char);
int pos=0;
char response[MAX_BYTES];
while(pos<size){
bzero(response,MAX_BYTES);
for(int i=0;i<MAX_BYTES;i++){
response[i]=temp->data[pos];
pos++;
}
send(socket,response,MAX_BYTES,0);
}
printf("Data retrived from the Cache\n\n");
printf("%s\n\n",response);
}
else if(bytes_send_client > 0)
{
len = strlen(buffer);
ParsedRequest* request = ParsedRequest_create();
if (ParsedRequest_parse(request, buffer, len) < 0)
{
printf("Parsing failed\n");
}
else
{
bzero(buffer, MAX_BYTES);
if(!strcmp(request->method,"GET"))
{
if( request->host && request->path && (checkHTTPversion(request->version) == 1) )
{
bytes_send_client = handle_request(socket, request, tempReq);
if(bytes_send_client == -1)
{
sendErrorMessage(socket, 500);
}
}
else
sendErrorMessage(socket, 500);
}
else
{
printf("This code doesn't support any method other than GET\n");
}
}
ParsedRequest_destroy(request);
}
else if( bytes_send_client < 0)
{
perror("Error in receiving from client.\n");
}
else if(bytes_send_client == 0)
{
printf("Client disconnected!\n");
}
shutdown(socket, SHUT_RDWR);
close(socket);
free(buffer);
sem_post(&seamaphore);
sem_getvalue(&seamaphore,&p);
printf("Semaphore post value:%d\n",p);
free(tempReq);
return NULL;
}
int main(int argc, char * argv[]) {
int client_socketId, client_len;
struct sockaddr_in server_addr, client_addr;
sem_init(&seamaphore,0,MAX_CLIENTS);
pthread_mutex_init(&lock,NULL);
if(argc == 2)
{
port_number = atoi(argv[1]);
}
else
{
printf("Too few arguments\n");
exit(1);
}
printf("Setting Proxy Server Port : %d\n",port_number);
proxy_socketId = socket(AF_INET, SOCK_STREAM, 0);
if( proxy_socketId < 0)
{
perror("Failed to create socket.\n");
exit(1);
}
int reuse =1;
if (setsockopt(proxy_socketId, SOL_SOCKET, SO_REUSEADDR, (const char*)&reuse, sizeof(reuse)) < 0)
perror("setsockopt(SO_REUSEADDR) failed\n");
bzero((char*)&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port_number);
server_addr.sin_addr.s_addr = INADDR_ANY;
if( bind(proxy_socketId, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0 )
{
perror("Port is not free\n");
exit(1);
}
printf("Binding on port: %d\n",port_number);
int listen_status = listen(proxy_socketId, MAX_CLIENTS);
if(listen_status < 0 )
{
perror("Error while Listening !\n");
exit(1);
}
int i = 0;
int Connected_socketId[MAX_CLIENTS];
while(1)
{
bzero((char*)&client_addr, sizeof(client_addr));
client_len = sizeof(client_addr);
client_socketId = accept(proxy_socketId, (struct sockaddr*)&client_addr,(socklen_t*)&client_len);
if(client_socketId < 0)
{
fprintf(stderr, "Error in Accepting connection !\n");
exit(1);
}
else{
Connected_socketId[i] = client_socketId;
}
struct sockaddr_in* client_pt = (struct sockaddr_in*)&client_addr;
struct in_addr ip_addr = client_pt->sin_addr;
char str[INET_ADDRSTRLEN];
inet_ntop( AF_INET, &ip_addr, str, INET_ADDRSTRLEN );
printf("Client is connected with port number: %d and ip address: %s \n",ntohs(client_addr.sin_port), str);
pthread_create(&tid[i],NULL,thread_fn, (void*)&Connected_socketId[i]);
i++;
}
close(proxy_socketId);
return 0;
}
cache_element* find(char* url){
cache_element* site=NULL;
int temp_lock_val = pthread_mutex_lock(&lock);
printf("Remove Cache Lock Acquired %d\n",temp_lock_val);
if(head!=NULL){
site = head;
while (site!=NULL)
{
if(!strcmp(site->url,url)){
printf("LRU Time Track Before : %ld", site->lru_time_track);
printf("\nurl found\n");
site->lru_time_track = time(NULL);
printf("LRU Time Track After : %ld", site->lru_time_track);
break;
}
site=site->next;
}
}
else {
printf("\nurl not found\n");
}
temp_lock_val = pthread_mutex_unlock(&lock);
printf("Remove Cache Lock Unlocked %d\n",temp_lock_val);
return site;
}
void remove_cache_element(){
cache_element * p ;
cache_element * q ;
cache_element * temp;
int temp_lock_val = pthread_mutex_lock(&lock);
printf("Remove Cache Lock Acquired %d\n",temp_lock_val);
if( head != NULL) {
for (q = head, p = head, temp =head ; q -> next != NULL;
q = q -> next) {
if(( (q -> next) -> lru_time_track) < (temp -> lru_time_track)) {
temp = q -> next;
p = q;
}
}
if(temp == head) {
head = head -> next;
} else {
p->next = temp->next;
}
cache_size = cache_size - (temp -> len) - sizeof(cache_element) -
strlen(temp -> url) - 1;
free(temp->data);
free(temp->url);
free(temp);
}
temp_lock_val = pthread_mutex_unlock(&lock);
printf("Remove Cache Lock Unlocked %d\n",temp_lock_val);
}
int add_cache_element(char* data,int size,char* url){
int temp_lock_val = pthread_mutex_lock(&lock);
printf("Add Cache Lock Acquired %d\n", temp_lock_val);
int element_size=size+1+strlen(url)+sizeof(cache_element);
if(element_size>MAX_ELEMENT_SIZE){
temp_lock_val = pthread_mutex_unlock(&lock);
printf("Add Cache Lock Unlocked %d\n", temp_lock_val);
return 0;
}
else
{ while(cache_size+element_size>MAX_SIZE){
remove_cache_element();
}
cache_element* element = (cache_element*) malloc(sizeof(cache_element));
element->data= (char*)malloc(size+1);
strcpy(element->data,data);
element -> url = (char*)malloc(1+( strlen( url )*sizeof(char) ));
strcpy( element -> url, url );
element->lru_time_track=time(NULL);
element->next=head;
element->len=size;
head=element;
cache_size+=element_size;
temp_lock_val = pthread_mutex_unlock(&lock);
printf("Add Cache Lock Unlocked %d\n", temp_lock_val);
return 1;
}
return 0;
}