/* Add the information in the given file to the list of unsolvable
* levels. Errors in the file are flagged but do not prevent the
* function from reading the rest of the file.
*/
static int readunslist(fileinfo *file)
{
char buf[256], token[256];
char const *p;
unsigned long hashval;
int setid, size;
int lineno, levelnum, n;
setid = 0;
for (lineno = 1 ; ; ++lineno) {
n = sizeof buf - 1;
if (!filegetline(file, buf, &n, NULL))
break;
for (p = buf ; isspace(*p) ; ++p) ;
if (!*p || *p == '#')
continue;
if (sscanf(p, "[%[^]]]", token) == 1) {
setid = lookupsetname(token, TRUE);
continue;
}
n = sscanf(p, "%d: %04X%08lX: %[^\n\r]",
&levelnum, &size, &hashval, token);
if (n > 0 && levelnum > 0 && levelnum < 65536 && setid) {
if (n == 1) {
n = sscanf(p, "%*d: %s", token);
if (n > 0 && !strcmp(token, "ok")) {
removefromunslist(setid, levelnum);
continue;
}
} else if (n >= 3) {
addtounslist(setid, levelnum, size, hashval,
n == 4 ? storestring(token) : 0);
continue;
}
}
warn("%s:%d: syntax error", file->name, lineno);
}
return TRUE;
}
int main(int argc, char** argv) {
FILE *fp;
char *name = (char *)malloc(sizeof(char)* 32);
char *password = (char *)malloc(sizeof(char) * 32);
char *confirm = (char *)malloc(sizeof(char) * 32);
char *user = (char *)malloc(sizeof(char) * 32);
char *auth = (char *)malloc(sizeof(char));
if(argc > 2 ) {
fprintf(stderr, "Usage: %s [-n]\n n: Create new user.\n", argv[0]);
exit(0);
}
// Add new user
if(argc == 2) {
fprintf(stdout, "Enter new username: "******"Enter password: "******"\nPlease confirm your password.\nEnter password: "******"\n");
if((strncmp(password, confirm, strlen(password))) != 0) {
fprintf(stderr, "Passwords do not match!\n");
exit(0);
}
strncpy(user, name, strlen(name)-1);
if((fp = fopen("masterlist.txt", "a+")) == NULL) {
fprintf(stderr, "Error opening master file!\n");
exit(0);
}
fprintf(fp, "%s-%s\n", user, password);
fclose(fp);
fprintf(stdout, "Success! %s has been added.\n", user);
}
fprintf(stdout, "Awaiting connection request...\n");
struct sockaddr_in my_addr, cli_addr;
int sockfd;
socklen_t slen = sizeof(cli_addr);
char buf[BUFLEN];
if((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
fprintf(stderr, "\nError: socket()\n");
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(PORT);
my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sockfd, (struct sockaddr*)&my_addr, sizeof(my_addr)) == -1) {
fprintf(stderr, "\nError: bind()\n");
}
// Receive username and password for authentication
int i = 1;
user = (char *)realloc(user, 16);
password = (char *)realloc(password, 16);
int len;
char *line = (char *)malloc(sizeof(char) * 16);
// Authentication loop
while(i) {
// Receive username & password
if(recvfrom(sockfd, user, 32, 0, (struct sockaddr*)&cli_addr, &slen) == -1) {
fprintf(stderr, "\nError: username recvfrom()\n");
}
// Receive password
if(recvfrom(sockfd, password, 16, 0, (struct sockaddr*)&cli_addr, &slen) == -1) {
fprintf(stderr, "\nError: password recvfrom()\n");
}
// Authenticate login credentials
if((fp = fopen("masterlist.txt", "r")) == NULL) {
fprintf(stderr, "\nError opening master file.\n");
exit(0);
}
// Combine user and password
int keylen = strlen(user) + strlen(password);
char *key = (char *)malloc(sizeof(char) * keylen);
strncat(key, user, strlen(user));
strncat(key, "-", 1);
strncat(key, password, strlen(password));
// Read master text file searching for correct username and password
while((len = filegetline(line, 32, fp)) > 0) {
if(strncmp(key, line, strlen(key)) == 0) {
// Send a 1 for success
auth = "1";
fprintf(stdout, "\n%s has connected...\n", user);
i = 0;
}
}
if(sendto(sockfd, auth, 16, 0, (struct sockaddr*)&cli_addr, slen) == -1) {
fprintf(stderr, "Error: sendto()\n");
}
}
// Messaging loop
while(1) {
fprintf(stdout, "Awaiting message from %s\n", user);
// receive from client
if(recvfrom(sockfd, buf, BUFLEN, 0, (struct sockaddr*)&cli_addr, &slen) == -1) {
fprintf(stderr, "Error: recvfrom()");
}
fprintf(stdout, "<%s>%s", user, buf);
// send to client
fprintf(stdout, "<%s>", NAME);
filegetline(buf, BUFLEN, stdin);
if(sendto(sockfd, buf, BUFLEN, 0, (struct sockaddr*)&cli_addr, slen) == -1) {
fprintf(stderr, "Error: sendto()\n");
}
}
}
