Initial revision

2005-04-21 14:53:53 +00:00
commit 9865aeaa79
2264 changed files with 411685 additions and 0 deletions
@@ -0,0 +1,113 @@
+/*
+ * TNET		A server program for MINIX which implements the TCP/IP
+ *		suite of networking protocols.  It is based on the
+ *		TCP/IP code written by Phil Karn et al, as found in
+ *		his NET package for Packet Radio communications.
+ *
+ *		This file contains an implementation of the "server"
+ *		for the TELNET protocol.  This protocol can be used to
+ *		remote-login on other systems, just like a normal TTY
+ *		session.
+ *
+ * Usage:	telnetd [-dv]
+ *
+ * Version:	@(#)telnetd.c	1.00	07/26/92
+ *
+ * Author:	Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ *		Michael Temari, <temari@temari.ae.ge.com>
+ */
+#include <sys/types.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <utmp.h>
+#include <time.h>
+#include <stdio.h>
+#include "telnetd.h"
+
+static char PATH_UTMP[] = "/etc/utmp";
+static char PATH_WTMP[] = "/usr/adm/wtmp";
+
+_PROTOTYPE(void wtmp, (int type, int linenr, char *line, pid_t pid,
+								char *host));
+_PROTOTYPE(void report, (char *label));
+
+void wtmp(type, linenr, line, pid, host)
+int type;			/* type of entry */
+int linenr;			/* line number in ttytab */
+char *line;			/* tty name (only good on login) */
+pid_t pid;			/* pid of process */
+char *host;			/* name of the remote host */
+{
+/* Log an event into the UTMP and WTMP files. */
+
+  struct utmp utmp;		/* UTMP/WTMP User Accounting */
+  int fd;
+
+  /* Clear the utmp record. */
+  memset((void *) &utmp, 0, sizeof(utmp));
+
+  /* Fill in utmp. */
+  switch (type) {
+  case LOGIN_PROCESS:
+  	/* A new login, fill in line and host name. */
+	strncpy(utmp.ut_line, line, sizeof(utmp.ut_line));
+	strncpy(utmp.ut_host, host, sizeof(utmp.ut_host));
+	break;
+
+  case DEAD_PROCESS:
+	/* A logout.  Use the current utmp entry, but make sure it is a
+	 * user process exiting, and not getty or login giving up.
+	 */
+	if ((fd = open(PATH_UTMP, O_RDONLY)) < 0) {
+		if (errno != ENOENT) report(PATH_UTMP);
+		return;
+	}
+	if (lseek(fd, (off_t) (linenr+1) * sizeof(utmp), SEEK_SET) == -1
+		|| read(fd, &utmp, sizeof(utmp)) == -1
+	) {
+		report(PATH_UTMP);
+		close(fd);
+		return;
+	}
+	close(fd);
+	if (utmp.ut_type != USER_PROCESS) return;
+	strncpy(utmp.ut_name, "", sizeof(utmp.ut_name));
+	break;
+  }
+
+  /* Finish new utmp entry. */
+  utmp.ut_pid = pid;
+  utmp.ut_type = type;
+  utmp.ut_time = time((time_t *) 0);
+
+  /* Write new entry to utmp. */
+  if ((fd = open(PATH_UTMP, O_WRONLY)) < 0
+	|| lseek(fd, (off_t) (linenr+1) * sizeof(utmp), SEEK_SET) == -1
+	|| write(fd, &utmp, sizeof(utmp)) == -1
+  ) {
+	if (errno != ENOENT) report(PATH_UTMP);
+  }
+  if (fd != -1) close(fd);
+
+  if (type == DEAD_PROCESS) {
+	/* Add new wtmp entry. */
+	if ((fd = open(PATH_WTMP, O_WRONLY | O_APPEND)) < 0
+		  || write(fd, &utmp, sizeof(utmp)) == -1
+	) {
+		if (errno != ENOENT) report(PATH_WTMP);
+	}
+	if (fd != -1) close(fd);
+  }
+}
+
+void report(label)
+char *label;
+{
+  char message[128];
+
+  sprintf(message, "telnetd: %s: %s\r\n", strerror(errno));
+  (void) write(1, message, strlen(message));
+}