run telnet from inetd, present login prompt if login is configured,
patch from Bastian Blank
diff --git a/networking/telnetd.c b/networking/telnetd.c
index d208319..d17682e 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -1,4 +1,4 @@
-/* $Id: telnetd.c,v 1.2 2002/11/10 22:26:19 bug1 Exp $
+/* $Id: telnetd.c,v 1.3 2003/01/21 20:55:56 bug1 Exp $
*
* Simple telnet server
* Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
@@ -48,7 +48,13 @@
#define BUFSIZE 4000
-static const char *loginpath = "/bin/sh";
+static const char *loginpath =
+#ifdef CONFIG_LOGIN
+"/bin/login";
+#else
+"/bin/sh";
+#endif
+static const char *issuefile = "/etc/issue.net";
/* shell name and arguments */
@@ -57,8 +63,12 @@
/* structure that describes a session */
struct tsession {
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ int sockfd_read, sockfd_write, ptyfd;
+#else /* CONFIG_FEATURE_TELNETD_INETD */
struct tsession *next;
int sockfd, ptyfd;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
int shell_pid;
/* two circular buffers */
char *buf1, *buf2;
@@ -204,7 +214,11 @@
static struct tsession *
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+make_new_session(void)
+#else /* CONFIG_FEATURE_TELNETD_INETD */
make_new_session(int sockfd)
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
{
struct termios termbuf;
int pty, pid;
@@ -214,7 +228,12 @@
ts->buf1 = (char *)(&ts[1]);
ts->buf2 = ts->buf1 + BUFSIZE;
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ ts->sockfd_read = 0;
+ ts->sockfd_write = 1;
+#else /* CONFIG_FEATURE_TELNETD_INETD */
ts->sockfd = sockfd;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
ts->rdidx1 = ts->wridx1 = ts->size1 = 0;
ts->rdidx2 = ts->wridx2 = ts->size2 = 0;
@@ -278,6 +297,8 @@
/*termbuf.c_lflag &= ~ICANON;*/
tcsetattr(0, TCSANOW, &termbuf);
+ print_login_issue(issuefile, NULL);
+
/* exec shell, with correct argv and env */
execv(loginpath, (char *const *)argv_init);
@@ -291,6 +312,7 @@
return ts;
}
+#ifndef CONFIG_FEATURE_TELNETD_INETD
static void
free_session(struct tsession *ts)
{
@@ -319,30 +341,44 @@
free(ts);
}
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
int
telnetd_main(int argc, char **argv)
{
+#ifndef CONFIG_FEATURE_TELNETD_INETD
struct sockaddr_in sa;
int master_fd;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
fd_set rdfdset, wrfdset;
int selret;
+#ifndef CONFIG_FEATURE_TELNETD_INETD
int on = 1;
int portnbr = 23;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
int c;
-
- /* check if user supplied a port number */
+ static const char options[] =
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ "f:l:";
+#else /* CONFIG_EATURE_TELNETD_INETD */
+ "f:l:p:";
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
for (;;) {
- c = getopt( argc, argv, "p:l:");
+ c = getopt( argc, argv, options);
if (c == EOF) break;
switch (c) {
- case 'p':
- portnbr = atoi(optarg);
+ case 'f':
+ issuefile = strdup (optarg);
break;
case 'l':
loginpath = strdup (optarg);
break;
+#ifndef CONFIG_FEATURE_TELNETD_INETD
+ case 'p':
+ portnbr = atoi(optarg);
+ break;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
default:
show_usage();
}
@@ -353,6 +389,12 @@
}
argv_init[0] = loginpath;
+
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ sessions = make_new_session();
+
+ maxfd = 1;
+#else /* CONFIG_EATURE_TELNETD_INETD */
sessions = 0;
/* Grab a TCP socket. */
@@ -382,6 +424,7 @@
maxfd = master_fd;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
do {
struct tsession *ts;
@@ -393,10 +436,14 @@
* ptys if there is room in their respective session buffers.
*/
+#ifndef CONFIG_FEATURE_TELNETD_INETD
FD_SET(master_fd, &rdfdset);
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
ts = sessions;
+#ifndef CONFIG_FEATURE_TELNETD_INETD
while (ts) {
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
/* buf1 is used from socket to pty
* buf2 is used from pty to socket
*/
@@ -404,22 +451,33 @@
FD_SET(ts->ptyfd, &wrfdset); /* can write to pty */
}
if (ts->size1 < BUFSIZE) {
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ FD_SET(ts->sockfd_read, &rdfdset); /* can read from socket */
+#else /* CONFIG_FEATURE_TELNETD_INETD */
FD_SET(ts->sockfd, &rdfdset); /* can read from socket */
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
}
if (ts->size2 > 0) {
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ FD_SET(ts->sockfd_write, &wrfdset); /* can write to socket */
+#else /* CONFIG_FEATURE_TELNETD_INETD */
FD_SET(ts->sockfd, &wrfdset); /* can write to socket */
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
}
if (ts->size2 < BUFSIZE) {
FD_SET(ts->ptyfd, &rdfdset); /* can read from pty */
}
+#ifndef CONFIG_FEATURE_TELNETD_INETD
ts = ts->next;
}
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
selret = select(maxfd + 1, &rdfdset, &wrfdset, 0, 0);
if (!selret)
break;
+#ifndef CONFIG_FEATURE_TELNETD_INETD
/* First check for and accept new sessions. */
if (FD_ISSET(master_fd, &rdfdset)) {
int fd, salen;
@@ -447,9 +505,12 @@
ts = sessions;
while (ts) { /* For all sessions... */
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
int maxlen, w, r;
+#ifndef CONFIG_FEATURE_TELNETD_INETD
struct tsession *next = ts->next; /* in case we free ts. */
-
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
+
if (ts->size1 && FD_ISSET(ts->ptyfd, &wrfdset)) {
int num_totty;
char *ptr;
@@ -459,9 +520,13 @@
w = write(ts->ptyfd, ptr, num_totty);
if (w < 0) {
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ exit(0);
+#else /* CONFIG_FEATURE_TELNETD_INETD */
free_session(ts);
ts = next;
continue;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
}
ts->wridx1 += w;
ts->size1 -= w;
@@ -469,31 +534,51 @@
ts->wridx1 = 0;
}
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ if (ts->size2 && FD_ISSET(ts->sockfd_write, &wrfdset)) {
+#else /* CONFIG_FEATURE_TELNETD_INETD */
if (ts->size2 && FD_ISSET(ts->sockfd, &wrfdset)) {
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
/* Write to socket from buffer 2. */
maxlen = MIN(BUFSIZE - ts->wridx2, ts->size2);
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ w = write(ts->sockfd_write, ts->buf2 + ts->wridx2, maxlen);
+ if (w < 0)
+ exit(0);
+#else /* CONFIG_FEATURE_TELNETD_INETD */
w = write(ts->sockfd, ts->buf2 + ts->wridx2, maxlen);
if (w < 0) {
free_session(ts);
ts = next;
continue;
}
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
ts->wridx2 += w;
ts->size2 -= w;
if (ts->wridx2 == BUFSIZE)
ts->wridx2 = 0;
}
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ if (ts->size1 < BUFSIZE && FD_ISSET(ts->sockfd_read, &rdfdset)) {
+#else /* CONFIG_FEATURE_TELNETD_INETD */
if (ts->size1 < BUFSIZE && FD_ISSET(ts->sockfd, &rdfdset)) {
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
/* Read from socket to buffer 1. */
maxlen = MIN(BUFSIZE - ts->rdidx1,
BUFSIZE - ts->size1);
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ r = read(ts->sockfd_read, ts->buf1 + ts->rdidx1, maxlen);
+ if (!r || (r < 0 && errno != EINTR))
+ exit(0);
+#else /* CONFIG_FEATURE_TELNETD_INETD */
r = read(ts->sockfd, ts->buf1 + ts->rdidx1, maxlen);
if (!r || (r < 0 && errno != EINTR)) {
free_session(ts);
ts = next;
continue;
}
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
if(!*(ts->buf1 + ts->rdidx1 + r - 1)) {
r--;
if(!r)
@@ -511,9 +596,13 @@
BUFSIZE - ts->size2);
r = read(ts->ptyfd, ts->buf2 + ts->rdidx2, maxlen);
if (!r || (r < 0 && errno != EINTR)) {
+#ifdef CONFIG_FEATURE_TELNETD_INETD
+ exit(0);
+#else /* CONFIG_FEATURE_TELNETD_INETD */
free_session(ts);
ts = next;
continue;
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
}
ts->rdidx2 += r;
ts->size2 += r;
@@ -529,8 +618,10 @@
ts->rdidx2 = 0;
ts->wridx2 = 0;
}
+#ifndef CONFIG_FEATURE_TELNETD_INETD
ts = next;
}
+#endif /* CONFIG_FEATURE_TELNETD_INETD */
} while (1);