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#include <stdio.h> | |
#include <netinet/in.h> | |
#include <sys/socket.h> | |
#include <sys/types.h> | |
#include <netdb.h> | |
#include <unistd.h> | |
#include <stdlib.h> | |
#include <service.h> | |
int compute(char part[12], int base) { | |
char* p = part; | |
int v = base; | |
while ((*p) && (p < part + 8)) | |
v = v + *(p++); | |
return v; | |
} | |
int validate (char* sn) { | |
int value1, value2; | |
char buf[8]; | |
sn[8] = 0; | |
strcpy(buf, sn); | |
value1 = compute(buf, 0); | |
strcpy(buf, (sn + 9)); | |
value2 = compute(buf, 0x41414141); | |
return value1 == value2; | |
} | |
void session(int cliSd) | |
{ | |
char buff[28]; | |
int recv_size, end_ptr = 0, done = 0; | |
struct sockaddr_in cliAddr; | |
int cliLen; | |
cliLen = sizeof(cliAddr); | |
getpeername(cliSd, (struct sockaddr *)&cliAddr, &cliLen); | |
printf("%s\t: Connected\n", inet_ntoa(cliAddr.sin_addr)); | |
send (cliSd, "Please enter your serial number:\r\n", 35, 0); | |
while (!done) { | |
recv_size = recv (cliSd, (char *) buff + end_ptr, sizeof (buff) - end_ptr, 0); | |
if (recv_size == 0) break; | |
if (recv_size == -1) continue; | |
end_ptr += recv_size; | |
if ((buff[end_ptr - 1] == 0) && end_ptr > 0) end_ptr--; | |
if ((buff[end_ptr - 1] == '\n') || (buff[end_ptr - 1] == '\r')) { | |
buff[end_ptr - 1] = 0; | |
if (validate(buff)) { | |
done = 1; | |
printf("%s\t: Succeeded!! <------------------\n", inet_ntoa(cliAddr.sin_addr)); | |
send (cliSd, "Thanks you for your registration.\r\n", 36, 0); | |
send (cliSd, "The confirmation number is " CONFIRM_CODE "\r\n", 30 + sizeof(CONFIRM_CODE), 0); | |
} else { | |
send (cliSd, "Sorry, wrong serial number.\r\n", 29, 0); | |
end_ptr = 0; | |
} | |
} | |
} | |
printf("%s\t: Disconnected or bad overflow\n", inet_ntoa(cliAddr.sin_addr)); | |
close(cliSd); | |
} | |
int main () { | |
struct sockaddr_in servAddr; | |
int servSd, cliSd; | |
int one = 1; | |
servSd = socket (PF_INET, SOCK_STREAM, 0); | |
setsockopt (servSd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one)); | |
servAddr.sin_family = AF_INET; | |
servAddr.sin_port = htons (12345); | |
servAddr.sin_addr.s_addr = htonl (INADDR_ANY); | |
if (bind (servSd, (struct sockaddr *) &servAddr, sizeof (servAddr)) < 0){ perror ("Can't bind\n"); return 1;} | |
if (listen (servSd, 3) < 0) { perror ("Can't listen\n"); return 1;} | |
while (1){ | |
printf ("Server is ready!\n"); | |
cliSd = accept (servSd, NULL, NULL); | |
if (fork()==0){ | |
session(cliSd); | |
return 0; | |
} | |
} | |
return 0; | |
} |
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service.h =
To compile
To test:
./serviceExecute # and for the other nc localhost 12345
Goal get
The confirmation number is xxxxxxx!