Date: Thu, 20 Nov 1997 14:58:18 -0500 (EST) From: dchapes@golden.net To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/5109: patch to ftpd, new option to limit number of ftpd sessions Message-ID: <199711201958.OAA02139@squigy.ddm.on.ca> Resent-Message-ID: <199711202000.MAA01996@hub.freebsd.org>
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>Number: 5109
>Category: bin
>Synopsis: patch to ftpd, new option to limit number of ftpd sessions
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 20 12:00:04 PST 1997
>Last-Modified:
>Originator: Dave Chapeskie
>Organization:
DDM Consulting
>Release: FreeBSD 2.2-STABLE i386
>Environment:
>Description:
FreeBSD's ftpd(8) has no way to limit the number of ftp clients
allowed at one time so I spent a few minutes to add and test a new
"-C maxchildren" option to ftpd to do this (when used with the
existing -D option).
It would be nice if someone with commit privileges could commit this.
The following patch is relative to FreeBSD-2.2.5 (actually 2.2-STABLE
shortly after 2.2.5) but should apply to -current as well.
>How-To-Repeat:
>Fix:
Index: ftpd.8
===================================================================
RCS file: /cvs/FreeBSD/src/libexec/ftpd/ftpd.8,v
retrieving revision 1.9.2.8
diff -u -r1.9.2.8 ftpd.8
--- ftpd.8 1997/05/10 19:48:12 1.9.2.8
+++ ftpd.8 1997/11/20 19:18:13
@@ -50,6 +50,7 @@
.Op Fl t Ar timeout
.Op Fl a Ar address
.Op Fl p Ar file
+.Op Fl C Ar maxchildren
.Sh DESCRIPTION
.Nm Ftpd
is the
@@ -137,6 +138,16 @@
.Ar file .
.It Fl A
Allow only anonymous ftp access
+.It Fl C
+When
+.Fl D
+is specified, limit the number of concurrent ftp sessions to
+.Ar maxchildren .
+If the file
+.Pa /etc/ftptoomany
+exists,
+.Nm
+displays it before exiting.
.El
.Pp
The file
@@ -429,6 +440,8 @@
Welcome notice.
.It Pa /etc/ftpmotd
Welcome notice after login.
+.It Pa /etc/ftptoomany
+Displayed when there are too many ftp sessions.
.It Pa /etc/nologin
Displayed and access refused.
.It Pa /var/log/ftpd
Index: ftpd.c
===================================================================
RCS file: /cvs/FreeBSD/src/libexec/ftpd/ftpd.c,v
retrieving revision 1.25.2.11
diff -u -r1.25.2.11 ftpd.c
--- ftpd.c 1997/09/05 12:45:29 1.25.2.11
+++ ftpd.c 1997/11/20 19:28:59
@@ -128,6 +128,8 @@
int debug;
int timeout = 900; /* timeout after 15 minutes of inactivity */
int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
+int maxchildren = 0;
+int children = 0;
int logging;
int restricted_data_ports = 1;
int paranoid = 1; /* be extra careful about security */
@@ -287,7 +289,7 @@
bind_address.s_addr = htonl(INADDR_ANY);
- while ((ch = getopt(argc, argv, "AdlDSURt:T:u:va:p:")) != -1) {
+ while ((ch = getopt(argc, argv, "AdlDSURt:T:u:va:p:C:")) != -1) {
switch (ch) {
case 'D':
daemon_mode++;
@@ -353,6 +355,10 @@
debug = 1;
break;
+ case 'C':
+ maxchildren = atoi(optarg);
+ break;
+
default:
warnx("unknown flag -%c ignored", optopt);
break;
@@ -441,6 +447,7 @@
while (1) {
addrlen = sizeof(his_addr);
fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen);
+ children++;
if (fork() == 0) {
/* child */
(void) dup2(fd, 0);
@@ -518,6 +525,23 @@
reply(530, "System not available.");
exit(0);
}
+
+ /* If there are too many ftpd's */
+ if (maxchildren && children > maxchildren) {
+ if ((fd = fopen(_PATH_FTPTOOMANY,"r")) != NULL) {
+ while (fgets(line, sizeof(line), fd) != NULL) {
+ if ((cp = strchr(line, '\n')) != NULL)
+ *cp = '\0';
+ lreply(530, "%s", line);
+ }
+ (void) fflush(stdout);
+ (void) fclose(fd);
+ } else {
+ reply(530, "Too many ftp users, try again later.");
+ }
+ exit(0);
+ }
+
#ifdef VIRTUAL_HOSTING
if ((fd = fopen(thishost->welcome, "r")) != NULL) {
#else
@@ -537,6 +561,14 @@
fatal("Ran out of memory.");
(void) gethostname(hostname, MAXHOSTNAMELEN);
#endif
+ if (daemon_mode) {
+ if (maxchildren) {
+ lreply(220, "There are currently %d users out of "
+ "%d possible.", children, maxchildren);
+ } else {
+ lreply(220, "There are currently %d users.", children);
+ }
+ }
reply(220, "%s FTP server (%s) ready.", hostname, version);
(void) setjmp(errcatch);
for (;;)
@@ -2222,7 +2254,9 @@
reapchild(signo)
int signo;
{
- while (wait3(NULL, WNOHANG, NULL) > 0);
+ while (wait3(NULL, WNOHANG, NULL) > 0) {
+ children--;
+ }
}
#ifdef OLD_SETPROCTITLE
Index: pathnames.h
===================================================================
RCS file: /cvs/FreeBSD/src/libexec/ftpd/pathnames.h,v
retrieving revision 1.6.2.2
diff -u -r1.6.2.2 pathnames.h
--- pathnames.h 1997/04/29 12:55:33 1.6.2.2
+++ pathnames.h 1997/11/20 18:40:15
@@ -42,3 +42,4 @@
#define _PATH_FTPHOSTS "/etc/ftphosts"
#define _PATH_FTPDSTATFILE "/var/log/ftpd"
#define _PATH_LS "/bin/ls"
+#define _PATH_FTPTOOMANY "/etc/ftptoomany"
>Audit-Trail:
>Unformatted:
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