void add_user(const struct userlist *u)
{
struct userlist *new_user=NULL;
if (search_by_addr(u->s_addr)) {
fprintf(stderr, "ip is used.\n");
return;
}
new_user = (struct userlist *)calloc(1, sizeof(struct userlist));
if (!new_user) {
perror("calloc");
return;
}
strcpy(new_user->name, u->name);
strcpy(new_user->host, u->host);
new_user->s_addr = u->s_addr;
new_user->next = NULL;
if(head == NULL)
head = new_user;
else {
new_user->next = head->next;
head->next = new_user;
}
}
int main(void)
{
int sfd, n;
char buf[1024];
usr_t *p;
socklen_t len;
struct sockaddr_in cli_addr;
get_usr_info("usr_info.txt");
sfd = sock_init(8000, "127.0.0.1");
while (1) {
len = sizeof(struct sockaddr_in);
n = recvfrom(sfd, buf, 1024, 0,
(struct sockaddr *)&cli_addr, &len);
buf[n] = '\0';
if (strncmp(buf, "syn", 3) == 0) { /* login */
char *name;
name = strstr(buf, " "); /* 客户端数据格式 "syn usr_name"*/
name++;
p = search_by_name(name);
if (p == NULL)
sendto(sfd, "fail", strlen("fail"), 0,
(struct sockaddr *)&cli_addr,
sizeof(cli_addr));
else {
p->is_online = 1;
p->addr = cli_addr;
sendto(sfd, "OK", strlen("OK"), 0,
(struct sockaddr *)&cli_addr,
sizeof(cli_addr));
}
#ifdef DEBUG
print();
#endif
} else if (strncmp(buf, "fin", 3) == 0) {/* logout */
char *name;
name = strstr(buf, " ");
name++;
p = search_by_name(name);
if (p == NULL)
sendto(sfd, "fail", strlen("fail"), 0,
(struct sockaddr *)&cli_addr,
sizeof(cli_addr));
else {
p->is_online = 0;
memset(&p->addr, 0, sizeof(p->addr));
sendto(sfd, "OK", strlen("OK"), 0,
(struct sockaddr *)&cli_addr,
sizeof(cli_addr));
}
#ifdef DEBUG
print();
#endif
} else { /* somebody talk */
char msg[32];
p = search_by_addr(&cli_addr);
if (p == NULL)
continue;
sprintf(msg, "%s say: ", p->usr_name);
for (p = head; p != NULL; p = p->next) { /* 广播 */
if (p->is_online) {
n = sendto(sfd, msg, strlen(msg), 0,
(struct sockaddr *)&p->addr,
sizeof(p->addr));
n = sendto(sfd, buf, strlen(buf), 0,
(struct sockaddr *)&p->addr,
sizeof(p->addr));
}
}
}
printf("one data over...\n");
}
destroy();
return 0;
}
