Hello all,
i have writen a patch for ftpd that alows it to limit the number of users
that log in. it currently works in daemon mode only.
the user limit can be set with the option "-C". (it will through up an error
if you use this option from "inetd").
If the "/etc/ftpwelcome" message is used then it will display the
current/maximum number of connections after this message.
If the user limit is not set then ftpd behaves as normal.
below is a patch against 4.5-RELEASE....
Hope this is of use to some one...
-OGGY
*** /usr/src/libexec/KEEP_ME/ftpd/ftpd.c Tue Dec 18 18:35:55 2001
--- /usr/src/libexec/ftpd/ftpd.c Thu Feb 7 22:16:12 2002
***************
*** 153,158 ****
--- 153,162 ----
int noretr=0; /* RETR command is disabled. */
int noguestretr=0; /* RETR command is disabled for anon users. */
+ /* Two variables used for connection limiting */
+ int maxusers = 0; /* maximum number of connections */
+ int users = 0; /*current number of connections */
+
sig_atomic_t transflag;
off_t file_size;
off_t byte_count;
***************
*** 302,308 ****
#endif /* OLD_SETPROCTITLE */
! while ((ch = getopt(argc, argv, "AdlDESURrt:T:u:vOoa:p:46")) != -1) {
switch (ch) {
case 'D':
daemon_mode++;
--- 306,312 ----
#endif /* OLD_SETPROCTITLE */
! while ((ch = getopt(argc, argv, "AdlDESC:URrt:T:u:vOoa:p:46")) != -1) {
switch (ch) {
case 'D':
daemon_mode++;
***************
*** 332,337 ****
--- 336,349 ----
stats++;
break;
+ /* Set the user limit */
+ case 'C':
+ if (daemon_mode == 0) {
+ warnx("User limiting doesn't work from a
+super-server");
+ }
+ maxusers = atoi(optarg);
+ break;
+
case 'T':
maxtimeout = atoi(optarg);
if (timeout > maxtimeout)
***************
*** 507,512 ****
--- 519,530 ----
while (1) {
addrlen = server_addr.su_len;
fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen);
+
+ /* We have a connection...*/
+ if (maxusers != 0) {
+ users++;
+ }
+
if (fork() == 0) {
/* child */
(void) dup2(fd, 0);
***************
*** 591,596 ****
--- 609,621 ----
reply(530, "System not available.");
exit(0);
}
+
+ /* Are there are toomany users....*/
+ if (maxusers != 0 && daemon_mode != 0 && users > maxusers) {
+ reply(421, "There are toomany users logged in. The maximum is: %lu",
maxusers);
+ dologout(0);
+ }
+
#ifdef VIRTUAL_HOSTING
if ((fd = fopen(thishost->welcome, "r")) != NULL) {
#else
***************
*** 601,606 ****
--- 626,636 ----
*cp = '\0';
lreply(220, "%s", line);
}
+ /* Lets tell them how many people are on...*/
+ if (maxusers != 0 && daemon_mode != 0){
+ lreply(230, "There are %lu users out of %lu logged in.",
+users,
maxusers);
+ }
+
(void) fflush(stdout);
(void) fclose(fd);
/* reply(220,) must follow */
***************
*** 2778,2783 ****
--- 2808,2819 ----
int signo;
{
while (wait3(NULL, WNOHANG, NULL) > 0);
+
+ /* We'd better update when someone has gone...*/
+ if (users !=0) {
+ users--;
+ }
+
}
#ifdef OLD_SETPROCTITLE
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